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Статті в журналах з теми "Luminescent property"
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Seymour, Linda M., Marco Nicola, Max I. Kessler, Claire L. Yost, Alessandro Bazzacco, Alessandro Marello, Enrico Ferraris, Roberto Gobetto, and Admir Masic. "On the production of ancient Egyptian blue: Multi-modal characterization and micron-scale luminescence mapping." PLOS ONE 15, no. 11 (November 24, 2020): e0242549. http://dx.doi.org/10.1371/journal.pone.0242549.
Повний текст джерелаАнотація:
The ancient pigment Egyptian blue has long been studied for its historical significance; however, recent work has shown that its unique visible induced luminescent property can be used both to identify the pigment and to inspire new materials with this characteristic. In this study, a multi-modal characterization approach is used to explore variations in ancient production of Egyptian blue from shabti statuettes found in the village of Deir el-Medina in Egypt (Luxor, West Bank) dating back to the New Kingdom (18th-20th Dynasties; about 1550–1077 BCE). Using quantitative SEM-EDS analysis, we identify two possible production groups of the Egyptian blue and demonstrate the presence of multiple phases within samples using cluster analysis and ternary diagram representations. Using both macro-scale non-invasive (X-rays fluorescence and multi-spectral imaging) and micro-sampling (SEM-EDS and Raman confocal microspectroscopy) techniques, we correlate photoluminescence and chemical composition of the ancient samples. We introduce Raman spectroscopic imaging as a means to capture simultaneously visible-induced luminesce and crystal structure and utilize it to identify two classes of luminescing and non-luminescing silicate phases in the pigment that may be connected to production technologies. The results presented here provide a new framework through which Egyptian blue can be studied and inform the design of new materials based on its luminescent property.
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Tao, Lei, Kai Lan, Cheng-Long Zhong, Ying-Jie Zhou, Ping Wang, Fan Fan, Zhihao Shen, and He-Lou Xie. "Wavelength-tunable linearly polarized luminescence film constructed using a highly efficient luminescent liquid crystal with stimuli-responsive property." Journal of Materials Chemistry C 8, no. 46 (2020): 16561–68. http://dx.doi.org/10.1039/d0tc04406g.
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Fan, Jung Chuan, Huang Huei Sung, and Chun Rong Lin. "The Anomalous Photoluminescence and Thermally Stimulated Luminescence from Carbon Nanotubes." Materials Science Forum 700 (September 2011): 116–19. http://dx.doi.org/10.4028/www.scientific.net/msf.700.116.
Повний текст джерелаАнотація:
The semiconducting property of carbon nanotubes have been investigated by the luminescence measurement. The morphology of carbon nanotubes has been detected by the scanning electric microscope, and the X ray diffraction determines the atomic structure of carbon nanotubes. The carbon nanotubes can be luminescence under laser irradiation. Using the photoluminescence measurement, the emitting spectrum of carbon naotubes is very spread in a near-red emission range and a main peak at 1.3 eV . The temperature dependent of photoluminescence effect indicates that the semiconducting property of carbon nanotubes is very clearly. According to the thermally photoluminescence experiment, the luminescent property of carbon nanotubes is due to the center of energy trap of defect. It is suggested that the luminescence of the semiconducting property result is dominated by the electron trap of defect in the carbon nanotubes system.
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Shi, Weiwei, Lei Liang, Jinping Zhang, Haihan Ye, Xincheng Hu, Jianwei Zhang, and Wei Wei. "A Versatile Luminescent Ga-Organic Framework with Multi-Emission Centers as a Blue LED and Fluorescent Probe for Low-Temperature Detection and Selective Fe3+ Sensing." Nanomaterials 12, no. 22 (November 15, 2022): 4009. http://dx.doi.org/10.3390/nano12224009.
Повний текст джерелаАнотація:
The development and utilization of 3p-block based MOFs as fluorescent materials has attracted significant attention in recent years. Herein, we have successfully constructed a versatile luminescent Ga-MOF (SNNU-63) with a 3d10 configuration and a large ligand twist configuration. Interestingly, the as-synthesized Ga-MOF exhibits excellent luminescence property and a good material for blue light-emitting diode (LED). At 80 K, this Ga-MOF shows multi-emission centers at 381, 462, and 494 nm. As a ratiometric thermometer, this Ga-MOF exhibits an excellent temperature sensing property with high relative sensitivity (Sm = 2.60 % K−1 at 110 K). The fluorescence intensity ratio I381/I494 shows a very good fit for the Boltzmann results (80–240 K). Moreover, the luminescent Ga-MOF exhibits an excellent selective detection of Fe3+ over other metal ions in aqueous an medium, and the limit of detection (LOD) towards Fe3+ ions is calculated to be 1.227 × 10−4 M. This work presents a versatile luminescent Ga-MOF material as a blue LED and fluorescent probe for low-temperature and selective Fe3+ sensing.
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Song, Ya, Guo Gong, Jingjing Du, Shaowen Xie, Min Ouyang, Yahui Feng, Jianxiong Xu, and Lijian Xu. "Synthesis and Inkjet Printing of NaYF4:Ln3+@NaYF4 Core–Shell Nanoparticles with Enhanced Upconversion Fluorescence for Anti-Counterfeiting Applications." Journal of Nanoscience and Nanotechnology 20, no. 3 (March 1, 2020): 1511–19. http://dx.doi.org/10.1166/jnn.2020.17353.
Повний текст джерелаАнотація:
Recently, lanthanide-doped upconversion luminescent materials have showed great potential in optical data storage, information encryption and anti-counterfeiting. However, the low upconversion luminescence still limited their applications. In this work, we fabricated RGB NaYF4:Ln3+@NaYF4 core–shell nanoparticles (CSNPs) with enhanced upconversion luminescence by coating an inert NaYF4 shell onto NaYF4:Ln3+ core nanoparticles via thermal decomposition method. The effect of increased shell temperature and addition of shell precursors on crystal phase, morphology and luminescent property of the synthesized CSNPs were systematically investigated. It was demonstrated that high shell growing temperature facilitated the formation of pure β-NaYF4 CSNPs. Upon increasing amount of shell precursors, the morphologies of hexagonal phase NaYF4 CSNPs changed from nanorod to nanocube and showed different luminescent properties. Pure hexagonal phase NaYF4 CSNPs with highest upconversion luminescence of about 15 times higher than NaYF4:Ln3+ core nanoparticles can be prepared at 310 °C with the addition of shell precursors at 3 mmol. Moreover, three-primary-color (RGB) CSNPs with enhanced upconversion luminescence were successfully prepared by changing the doping pair of lanthanide ions in core. The synthesized RGB CSNPs were fabricated into environment friendly luminescent ink by sequential surface modification by PAA ligand and dispersing in mixture solvent of ethanol, water and glycerol. Comparative results showed that the fluorescence enhanced RGB CSNPs inks were more suitable for inkjet printing of multicolored, complex and high resolution luminescent anti-counterfeiting patterns on paper substrates.
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Saotome, Satoru, Kazumasa Suenaga, Kazuo Tanaka, and Yoshiki Chujo. "Design for multi-step mechanochromic luminescence property by enhancement of environmental sensitivity in a solid-state emissive boron complex." Materials Chemistry Frontiers 4, no. 6 (2020): 1781–88. http://dx.doi.org/10.1039/c9qm00719a.
Повний текст джерелаАнотація:
The solid-state emissive boron complex with multi-step mechanochromic luminescence was designed. The crystalline sample showed gradual changes in luminescent color triggered by scratching. The design concept is illustrated.
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HAO, WEICHANG, HAIBIN FEN, JUNYING ZHANG, and TIANMIN WANG. "LUMINESCENT PROPERTY OF ZNO GRANULAR FILMS WITH DIFFERENT PARTICLE SIZE." International Journal of Modern Physics B 24, no. 15n16 (June 30, 2010): 2827–32. http://dx.doi.org/10.1142/s0217979210065702.
Повний текст джерелаАнотація:
Zinc oxide has received extensive attention for its unique luminescence properties. In this paper, ZnO granular films were prepared on the Si wafer and quartz substrate by Layer-by-Layer electrostatic self-assembly method. The effect of sol concentration on particle size and photoluminescence properties was investigated. SEM images indicate that ZnO particle size increases with sol concentration improving. Absorption edge and photoluminescence peak have a red-shift with particle size increase. The emission peak shift is resulted from particle size effect and the change of oxygen vacancy concentration in surface. The luminescent property of granular film shows big difference with that of ZnO sol. This difference is related to the assembly state of ZnO nanoparticles.
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Hasegawa, Takuya, Kenji Toda, Tadashi Ishigaki, Shinnosuke Kamei, Sun Woog Kim, Kazuyoshi Uematsu, Mineo Sato, and Msahiro Yoshimura. "Luminescence of Phosphor Balls Prepared Using Melt Quenching Synthesis Method." Materials Science Forum 883 (January 2017): 17–21. http://dx.doi.org/10.4028/www.scientific.net/msf.883.17.
Повний текст джерелаАнотація:
Well-grown M3MgSi2O8(M = Ca, Sr and Ba):Eu2+ phosphors were synthesized by novel melt quenching synthesis method. The luminescence property of the Sr3MgSi2O8:Eu2+ phosphor synthesized by the melt synthesis method is comparable to those of the sample synthesized by a conventional solid state reaction. Sintered phosphor balls with excellent luminescent characteristics were obtained.
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Li, Zeren. "The Luminescent Property of Magnetic Polymers and Its Influencing Factors." E3S Web of Conferences 213 (2020): 02011. http://dx.doi.org/10.1051/e3sconf/202021302011.
Повний текст джерелаАнотація:
In this paper, the generation mechanism, influencing factors and application of the luminescent properties of magnetic polymers are reviewed. In practical applications, magnetic polymers exhibit a variety of unique luminescent properties, including photoluminescence, electroluminescence and thermoluminescence. There are many factors affecting the luminescent properties of different kinds of magnetic polymers, including the types of magnetic centers, the properties of metal ions, the charge transfer between metal ions and ligands, and the influence of functional groups on the main and side chains of the polymers. This paper explains the luminescent properties of magnetic polymers from the aspects of generation mechanism and influencing factors.
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Xu, Chao Nan, C. Li, Y. Imai, H. Yamada, Y. Adachi, and K. Nishikubo. "Development of Elastico-Luminescent Nanoparticles and their Applications." Advances in Science and Technology 45 (October 2006): 939–44. http://dx.doi.org/10.4028/www.scientific.net/ast.45.939.
Повний текст джерелаАнотація:
Recently we have proposed that stress distribution of a subject can be visualized by utilizing a novel mechanoluminescence phenomenon that can give intense visible light emission by application of mechanical stress. As the luminescence intensity is proportional to the time-variation of strain energy in the elastic region, we call it elastico-luminescence. In order to realize a high space resolution in such visualization for stress distribution, we aim to develop strong elastico-luminescent nanoparticles, such as a controlled structure of α-SrAl2O4:Eu (monoclinic phase). The processing of the nanoparticles, the property and the applications will be reported in the present work.
Дисертації з теми "Luminescent property"
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Pitz, Demian [Verfasser], Radim [Akademischer Betreuer] Berànek, and Ralf [Akademischer Betreuer] Giernoth. "Structure-property relationship of luminescent ionic polymers / Demian Pitz. Gutachter: Radim Berànek ; Ralf Giernoth." Bochum : Ruhr-Universität Bochum, 2016. http://d-nb.info/1095884565/34.
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Narikiyo, Hayato. "Development of Functional Materials Based on Polyhedral Oligomeric Silsesquioxane with Flexible Side-Chains." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263688.
Повний текст джерелаАнотація:
付記する学位プログラム名: 充実した健康長寿社会を築く総合医療開発リーダー育成プログラム京都大学
新制・課程博士
博士(工学)
甲第23227号
工博第4871号
京都大学大学院工学研究科高分子化学専攻
(主査)教授 田中 一生, 教授 秋吉 一成, 教授 古賀 毅
学位規則第4条第1項該当
Doctor of Philosophy (Engineering)
Kyoto University
DGAM
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Wang, Zheng. "Synthesis, properties and applications of glasses containing chalcogenide quantum dots." Electronic Thesis or Diss., Université de Rennes (2023-....), 2023. http://www.theses.fr/2023URENS093.
Повний текст джерелаАнотація:
Dans cette thèse, la synthèse, les propriétés et les applications de verres contenant des quantum dots (QDs) de chalcogénure ont été étudiées. Des verres contenant des QDs à base de chalcogénure de plomb (PbSe ou PbS) ont été préparés. Leurs propriétés optiques et leurs applications potentielles ont été explorées en combinaison avec le co-dopage aux ions Tm3+. De plus, sur la base de ces résultats, des verres contenant des QDs de ZnS ou de ZnSe, sans plomb, ont été préparés avec succès. Leurs performances luminescentes ont été encore améliorées par dopage avec des ions de métaux de transition représentés ici par le nickel. Ces résultats jettent les bases pour l’amélioration des propriétés optiques de verres contant des QDs à base de chalcogénure de plomb et aussi pour le développement de verres aux QD sans métaux lourds et donc plus respectueux de l’environnement. Bien que des améliorations futures soient possibles et nécessaires pour des applications réelles, ces verres aux QDs de chalcogénure, développés dans ce travail, présentent un potentiel d'applications dans les domaines des concentrateurs solaires luminescents, de l'anti-contrefaçon optique, de l'éclairage à semi-conducteurs et de la mesure optique de la températureIn this dissertation, the synthesis, properties and applications of glasses containing chalcogenide quantum dots (QDs) have been studied. Multicomponent lead chalcogenide QDs glasses (containing PbSe or PbS QDs) were successfully prepared, and their optical properties and potential applications were explored in combination with rare earth Tm3+ ion doping. In addition, based on the results, lead-free and environmentally friendly chalcogenide QDs glasses (containing ZnS or ZnSe QDs) were successfully prepared, and its luminescent performance was further improved by doping with transition metal nickel ions. These results lay the foundation for the improvement of optical properties of lead-based chalcogenide QDs and for the development of environmentally friendly heavy metal-free chalcogenide QDs glasses. Although future improvements are possible and necessary for practical applications, these chalcogenide QDs glasses developed in this work have application potential in the fields of luminescent solar concentrators, optical anti-counterfeiting, solid-state lighting, and optical temperature sensing
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De, Silva Mawanana H. Channa R. "Lanthanide-containing Functional Materials: Exploratory Synthesis and Property Investigation." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195622.
Повний текст джерелаАнотація:
The research summarized in this dissertation is aimed at the design and exploratory synthesis, characterization, and property investigation of lanthanide-based functional materials. The substances prepared in this work, including small molecular complexes and nanostructured particles, are of fundamental scientific interest as well as practical significance due to the unique chemical and physical properties of the lanthanide elements. Envisioned applications include their uses as light-emitting materials in modern display technology, optical amplifiers, and high-density magnetic recording media. This research seeks to develop general methods for directing the formation of lanthanide materials, particularly as a means of influencing the physical properties of such materials. These efforts are elaborated in distinct yet related projects.In Chapter 2, exploratory synthesis, structural characterization, and photo-physical investigation of adducts of lanthanide β-diketonates with a tridentate neutral ligand, TPTZ are described.In Chapter 3, analogous studies utilizing p,p'-disubstituted bipyridine and phenathroline type bidentate neutral ligands are detailed. The structures of the complexes have been established by single crystal X-ray diffraction. Compositional and structural differences among the various complexes are caused by different structural and electronic properties of the ligands and overall steric compactness of the coordination sphere. Red and green luminescence characteristics of Eu(III) and Tb(III) ions are observed for the corresponding complexes, upon UV excitation, consistent with the well-established ligand-mediated energy transfer and light emission mechanism.In Chapter 4, the electroluminescence properties of various europium complexes are evaluated for their potential as emissive materials in organic light-emitting diodes.The synthesis and characterization of Er-doped LaPO4 nanoparticles are described in Chapter 5 together with the preparation and studies of hybrid nanocomposites composed of nanoparticle-doped sol-gels. A single-mode waveguide system was fabricated, wherein Er-doped nanoparticles solubilized in a sol-gel matrix has shown promising performance in propagating light signals (1.54 µm) without significant optical losses.In Chapter 6, synthesis, electron microscopic characterization and magnetic studies of crystalline Sm(III)- and Eu(III)-doped Fe3O4 nanoparticles are detailed. Magnetic studies suggest the ferromagnetic behavior of the lanthanide-doped Fe3O4 nanoparticles at room temperature and therefore, the significant effects of lanthanide doping.
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Bovo, Laura. "Nanostructured Materials Based on ZnO for Cataltytic, Optical and Magnetic Applications." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3423214.
Повний текст джерелаАнотація:
ZnO based materials, such as Zn1-xTMxO (TM = Mn, Co, Cu) nanopowders, were synthesised by a Sol gel route to investigate their properties in three fields: catalysis, optics and magnetism. These materials were characterised by complementary techniques such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS) and UV-Vis Spectroscopy. The fine structure and electronic properties of these nanomaterials were studied by X-ray Absorption Spectroscopy (XAS) and Electron Paramagnetic Resonance (EPR). These techniques give site, element and chemical specific measurements which allow a better understanding of the interplay and role of each element in the functionality of the system.
The catalytic performance of undoped and Cu-doped ZnO nanosystems were tested with respect to the Methanol Steam Reforming (MSR) reaction. Contrary to what is generally accepted in literature, the results obtained in this study demonstrate that ZnO also plays a prominent role in this catalytic process. The structure–activity relationship of ZnO and copper-doped ZnO catalysts described in this work give an insight into the effective function of each component which is vital to enable the rational design of improved catalysts.
The luminescence properties of the doped Zn1-xTMxO nanopowders were investigated with X-ray Excited Optical Luminescence (XEOL) techniques: these experiments provided a better understanding of the relationship between the electronic structure of the systems and their properties. Results showed how it is possible to manipulate the luminescence of ZnO grown by Sol gel by modifying synthesis conditions – i.e. the annealing temperature and the nature and concentration of the transition metal ion.
Finally, preliminary results were presented on the materials' magnetic properties, obtained by SQUID (Superconducting Quantum Interference Devices) magnetometry, where the coexistence of different contributions has been detected. Even though further characterisation is still needed, this study is a step towards the determination of the nature of magnetic interactions in such systems, of which there has been considerable debate in the scientific community.Materiali a base di ZnO, in particolare nano-polveri di Zn1-xTMxO (TM = Mn, Co, Cu), sono stati sintetizzati via Sol gel per studiarne le proprietà in tre diversi campi applicativi quali la catalisi, l’ottica ed il magnetismo. Tali materiali sono stati caratterizzati utilizzando diverse tecniche, complementari tra loro, quali X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS) e UV-Vis Spectroscopy. X-ray Absorption Spectroscopy (XAS) ed Electron Paramagnetic Resonance (EPR) vengono invece impiegate per studiare le proprietà elettroniche e di struttura fine delle nano-polveri. Tali caratterizzazioni si sono dimostrate fondamentali per la comprensione delle proprietà del sistema ed, in particolare, per cercare di identificare le interazioni sussistenti tra struttura, composizione, morfologia dei materiali e la loro capacità di espletare una determinata funzionalità. Nano-polveri di ZnO tal quali e drogate con ioni rame vengono testate come catalizzatori nella reazione di Steam Reforming del metanolo. I risultati ottenuti in questo studio dimostrano il ruolo attivo dell’ossido di zinco nel processo catalitico, contrariamente a quanto solitamente accettato in letteratura. La relazione sussistente tra struttura-attività nei catalizzatori a base di ZnO permette di ottenere informazioni circa l’effettiva funzione di ogni componente, aspetto di estrema importanza per la progettazione razionale di catalizzatori con elevate performance. Le proprietà di luminescenza dei sistemi drogati Zn1-xTMxO vengono studiate mediante spettroscopia X-ray Excited Optical Luminescence (XEOL); tali esperimenti forniscono una migliore comprensione del rapporto che sussiste tra la struttura elettronica dei sistemi in esame e le loro proprietà di emissione. I risultati mostrano come sia possibile modulare la luminescenza di ZnO prodotto via Sol gel modificando le condizioni di sintesi – i.e. temperatura di trattamento, natura e concentrazione del metallo di transizione utilizzato come drogante. Infine, risultati preliminari sulle proprietà magnetiche dei materiali ottenuti mediante SQUID magnetometer (Superconducting Quantum Interference Devices) hanno rivelato la coesistenza di diversi contributi magnetici. Nonostante ulteriori caratterizzazioni siano sicuramente necessarie, questo studio si è rivelato un passo avanti verso una comprensione della natura delle interazioni magnetiche in tali sistemi, da tempo causa di vivace dibattito nella comunità scientifica.
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Diaz, Anthony L. "Fundamental structure-property relationships in luminescent materials." Thesis, 1996. http://hdl.handle.net/1957/34211.
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Lin, Li-yang, and 林利陽. "Polypeptides containing luminescent units with aggregation-induced emission property." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/j25965.
Повний текст джерелаАнотація:
碩士國立中山大學
材料與光電科學學系研究所
103
First chapter: Tetraphenylthiophene (TP) with aggregation-enhanced emission (AEE) property was used as terminal fluorophore of the water-soluble poly(γ-propargyl-L-glutamate) (PPLG)-based polymers of TP-PPLG-g-MEO2. In this study, we research various TP-PPLG-g-MEO2 affect aggregation of luminescence. In water, when concentration of TP-PPLG-g-MEO2 achieve CMC, TP-PPLG-g-MEO2 will aggregation to nanoparticle and suddenly increasing emission, and when heating over LCST, TP-PPLG-g-MEO2 will contract and also enhance emission. We use TP-PPLG-g-MEO2 “salt out effect” property to probe salt in water, salt have interaction with side chain MEO2 and peptide main chain to make TP-PPLG-g-MEO2 contract together and change secondary structure to b-sheet conformation to enhance emission. In the strong alkaline media, TP-PPLG-g-MEO2 backbone change to random coil conformation that break intramolecular hydrogen bonding and loss LCST property, TP-PPLG-g-MEO2 become is a micelle like structure, core was hydrophobic TP and shell was hydrophilic polypeptide and particle size about 500nm measure by DLS. In random coil conformation, chain end hydrophobic TP have strong aggregation than in the a-helical and have strong aggregation emission peak. At last, we use TP-PPLG-g-MEO2 to detect BSA. When TP-PPLG-g-MEO2 mixture with BSA, TP-PPLG-g-MEO2 will fall in to BSA and separate to decrease TP-PPLG-g-MEO2 aggregation and emission. Second chapter: We synthesis polypeptide contain TPA pendent by click reaction. The resulting PPLG-g-TPA contains the crystalline TPA side groups, Tm about 145 oC and is therefore high Tg materials with the desired AIE activity. Due to side chain TPA, PPLG-g-TPA have piezofluorochromic property that have two color between crystal and amorphous state. The lone pair electrons of nitrogen atom in TPA side groups inherit PPLG-g-TPA the sensitivity toward acid HCl and metal ions. Emission of PPLG-g-TPA was progressively decreased upon increasing the amounts of HCl and metal ions in the solutions that can be acid or metal ions sensor.
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Mukherjee, Sanjoy. "Investigations of Structure-Property Relationships in NPI and BODIPY Based Luminescent Material." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3933.
Повний текст джерелаАнотація:
Luminescent materials find numerous applications in recent times and have enriched human lives in several different ways. From display and lighting technologies to security, sensing and biological investigations, luminescent organic compounds have become indispensible and often preferred over their inorganic counterparts. The versatility of organic materials arises from their comparative low costs, ease of fine-tuning, low toxicity and the possibility to develop flexible devices. Even until very recent times, the investigations and usage of organic luminescent materials were mostly limited to solution-state properties. However, with progress of available characterisation techniques and parallel development of their usage in solid-state devices and other applications (e.g. security, forensics, sensing etc.), significantly greater attention has been paid to the development and investigations of solid-state emissive organic materials. In solid-state applications, apart from the molecular properties of any given material, their cumulative i.e. bulk physical properties are of even greater importance. Thus, investigations of structure-property relationships in organic luminescent compounds to understand their molecular and bulk properties are of fundamental interest. In this thesis, NPI (1,8-naphthalimide) and BODIPY (boron-dipyrromethene) dyes were investigated to provide a broad overview of their structure-property correlations. Among commonly encountered organic luminescent materials, NPIs and BODIPYs have emerged as two broad classes of luminescent organic compounds, finding applications as functional luminescent materials in various fields. However, lack of understanding for controlling the cumulative emissive properties of these compounds has limited their usage as active solid-state emitters in various applications. This thesis presents several new insights into the molecular and bulk emissive properties of these two classes of luminescent dyes (NPIs and BODIPYs). The contents of the six chapters contained in this thesis are summarised below.
Chapter 1 summarises the available understanding of the basic concepts of photoluminescence and the design strategies to develop solid-state luminescent and AIE (aggregation-induced emission) active materials. This chapter also emphasises in the basic nature of the NPI and BODIPY compounds, their substitution patterns and their inherent characteristics and touches upon the relatively unexplored properties of NPI and BODIPY based materials. The importance and scope of the work reported in the thesis is outlined at the end of the chapter.
Chapter 2 describes a detailed investigation of a series of seven (4-oxoaryl substituted) NPI compounds (1-7) providing an insight into the molecular and cumulative photophysical
behaviour of these compounds. The low ICT characteristics of the NPIs, coupled with the
twisted geometry, facilitated solid-state
luminescence in these materials. The solution and solid-state luminescent properties of these compounds can be directly correlated to their structural rigidity, nature of substituents and solid-state intermolecular interactions (e.g. π-π stacking, C-H•••O interactions etc.). The solid-state crystal structures of the NPI siblings are profoundly affected by the pendant substituents. All of the NPIs (1-7) show antiparallel dimeric π-π stacking interactions in the solid-state which can further extend in parallel, alternate, orthogonal or lateral fashion depending on the steric and electronic nature of the C-4′ substituents. Structural investigations including Hirsfeld surface analysis methods reveal that while strongly interacting systems show weak to moderate emission in their condensed states, weakly interacting systems show strong emission yields under the same conditions. The nature of packing and extended structures also affects the emission colors of the NPIs in the solid-state. DFT computational studies were utilized to understand the molecular and cumulative electronic behavior of the NPIs. Apart from the investigation of solid-state luminescence, other functional potentials of these NPIs were also explored. One of the compounds (i.e. 4) shows chemodosimetric response towards aqueous Hg(II) species with a ‘turn-on’ response. Also, depending on the molecular flexibility of the compounds, promising AIEE (aggregation-induced emission enhancement) features were observed in these NPIs. Later (in Chapter 3), we developed a systematic investigation in a series of purely organic NPIs, restricting various parameters, to attain a thorough understanding of such AIEE properties.
Chapter 3 describes a detailed experimental and computational study in order gain an insight into the AIE (aggregation-induced emission) and AIEE mechanisms in NPI compounds.
Systematic structural perturbation was used to fine tune the luminescence properties of three new 1,8-naphthalimides (8-10) in solution and as aggregates. The NPIs (8-10) show blue emission in solution state and the fluorescence quantum yields depend on their molecular rigidity. In concentrated solutions of the NPIs, intermolecular interactions were found to result in quenching of fluorescence. In contrast, upon aggregation (in THF:H2O mixtures), two of the NPIs show aggregation-induced-emission-enhancement (AIEE). The NPIs also show moderately high solid-state emission quantum yields (~10-12.7 %). The AIEE behaviors of the NPIs depend on their molecular rigidity and nature of intermolecular interactions. The NPIs (8-10) show different extents of intermolecular (π-π and C-H•••O) interactions in their solid-state structures depending on their substituents. Detailed photophysical, computational and structural investigations suggest that only an optimal balance of structural flexibility and intermolecular communication is the effective recipe for achieving AIEE characteristics in these NPIs.
Chapter 4 presents the design, synthesis and detailed investigations and potential applications of a series of NPI-BODIPY dyads (11-13). The NPI and BODIPY moieties in these dyads are electronically separated by oxoaryl bridges and the compounds only differ structurally with respect to methyl substitutions on the BODIPY fluorophore. The NPI and BODIPY moieties retain their optical features in these molecular dyads (11- 13). Dyads 11-13 show dual emission in solution state originating from the two separate fluorescent units. The variations of the dual emission in these compounds are controlled by the structural flexibility of the systems. The
dyads also show significant AIES (Aggregation-Induced-Emission Switching) features upon formation of nano-aggregates in THF-H2O mixtures with visual changes in emission from green to red color. Whereas the flexible and aggregation prone system (i.e. compound 11) shows aggregation-induced enhancement of emission, rigid systems with less favorable intermolecular interactions (i.e. compound 12-13) show aggregation-induced quenching of emission. The emission-intensity vs. the structural-flexibility correlations were found to be reverse in solution and aggregated states. Photophysical and structural investigations suggest that the intermolecular interactions (e.g. π-π stacking etc.) play major role in controlling emission of these compounds in aggregated states. Similar trends were also observed in the solid-state luminescence of these compounds. The applications of the luminescent dyads 11-13 as live-cell imaging dyes was also investigated.
Chapter 5 describes investigations of photophysical properties of a series of six BODIPY dyes (14-19) in which there is a systematic alteration of a common -C6H4Si(CH3)3 substituent. Inrelated constitutional isomers, the systematic increment of steric congestion and lowering of molecular symmetry around the BODIPY core result in a steady increment of
solution and solid- state fluorescence quantum yields. The increasing fluorescence quantum yields (solution, solid state) with increasing steric congestions show that the molecular free rotation and aggregation-induced fluorescence quenching of BODIPYs can be successfully suppressed by lowering the flexibility of the molecules. Photophysical and DFT investigations reveal that the electronic band gap in any set of these constitutional isomers remain almost similar. However, the crystal structures of the compounds reveal that the solid-state colour and quantum yields of the compounds in solid-state are also related to the nature of intermolecular interactions.
Chapter 6 demonstrates the use of DFT computational methods to understand the effect of alkyl groups in governing the basic structural and electronic aspects of BODIPY dyes. As demonstrated in Chapter 4 and Chapter 5, apparently electronically inactive alkyl groups can be of immense importance to control the overall photophysics of BODIPYs. In this context, a systematic strategy su was utilized considering all possible outcomes of constitutionally-isomeric molecules to understand the effects of alkyl groups on the BODIPY molecules. Four different computational methods were employed to ascertain the unanimity of the observed trends associated with the molecular properties. In line with experimental observations, it was found that alkyl substituents in BODIPY dyes situated at 3/5-positions effectively participate in stabilization as well as planarization of such molecules. Screening of all the possible isomeric molecular systems was used to understand the individual properties and overall effects of the typical alkyl substituents in controlling several basic properties of such BODIPY molecules.
9
Mukherjee, Sanjoy. "Investigations of Structure-Property Relationships in NPI and BODIPY Based Luminescent Material." Thesis, 2015. http://etd.iisc.ernet.in/2005/3933.
Повний текст джерелаАнотація:
Luminescent materials find numerous applications in recent times and have enriched human lives in several different ways. From display and lighting technologies to security, sensing and biological investigations, luminescent organic compounds have become indispensible and often preferred over their inorganic counterparts. The versatility of organic materials arises from their comparative low costs, ease of fine-tuning, low toxicity and the possibility to develop flexible devices. Even until very recent times, the investigations and usage of organic luminescent materials were mostly limited to solution-state properties. However, with progress of available characterisation techniques and parallel development of their usage in solid-state devices and other applications (e.g. security, forensics, sensing etc.), significantly greater attention has been paid to the development and investigations of solid-state emissive organic materials. In solid-state applications, apart from the molecular properties of any given material, their cumulative i.e. bulk physical properties are of even greater importance. Thus, investigations of structure-property relationships in organic luminescent compounds to understand their molecular and bulk properties are of fundamental interest. In this thesis, NPI (1,8-naphthalimide) and BODIPY (boron-dipyrromethene) dyes were investigated to provide a broad overview of their structure-property correlations. Among commonly encountered organic luminescent materials, NPIs and BODIPYs have emerged as two broad classes of luminescent organic compounds, finding applications as functional luminescent materials in various fields. However, lack of understanding for controlling the cumulative emissive properties of these compounds has limited their usage as active solid-state emitters in various applications. This thesis presents several new insights into the molecular and bulk emissive properties of these two classes of luminescent dyes (NPIs and BODIPYs). The contents of the six chapters contained in this thesis are summarised below.
Chapter 1 summarises the available understanding of the basic concepts of photoluminescence and the design strategies to develop solid-state luminescent and AIE (aggregation-induced emission) active materials. This chapter also emphasises in the basic nature of the NPI and BODIPY compounds, their substitution patterns and their inherent characteristics and touches upon the relatively unexplored properties of NPI and BODIPY based materials. The importance and scope of the work reported in the thesis is outlined at the end of the chapter.
Chapter 2 describes a detailed investigation of a series of seven (4-oxoaryl substituted) NPI compounds (1-7) providing an insight into the molecular and cumulative photophysical
behaviour of these compounds. The low ICT characteristics of the NPIs, coupled with the
twisted geometry, facilitated solid-state
luminescence in these materials. The solution and solid-state luminescent properties of these compounds can be directly correlated to their structural rigidity, nature of substituents and solid-state intermolecular interactions (e.g. π-π stacking, C-H•••O interactions etc.). The solid-state crystal structures of the NPI siblings are profoundly affected by the pendant substituents. All of the NPIs (1-7) show antiparallel dimeric π-π stacking interactions in the solid-state which can further extend in parallel, alternate, orthogonal or lateral fashion depending on the steric and electronic nature of the C-4′ substituents. Structural investigations including Hirsfeld surface analysis methods reveal that while strongly interacting systems show weak to moderate emission in their condensed states, weakly interacting systems show strong emission yields under the same conditions. The nature of packing and extended structures also affects the emission colors of the NPIs in the solid-state. DFT computational studies were utilized to understand the molecular and cumulative electronic behavior of the NPIs. Apart from the investigation of solid-state luminescence, other functional potentials of these NPIs were also explored. One of the compounds (i.e. 4) shows chemodosimetric response towards aqueous Hg(II) species with a ‘turn-on’ response. Also, depending on the molecular flexibility of the compounds, promising AIEE (aggregation-induced emission enhancement) features were observed in these NPIs. Later (in Chapter 3), we developed a systematic investigation in a series of purely organic NPIs, restricting various parameters, to attain a thorough understanding of such AIEE properties.
Chapter 3 describes a detailed experimental and computational study in order gain an insight into the AIE (aggregation-induced emission) and AIEE mechanisms in NPI compounds.
Systematic structural perturbation was used to fine tune the luminescence properties of three new 1,8-naphthalimides (8-10) in solution and as aggregates. The NPIs (8-10) show blue emission in solution state and the fluorescence quantum yields depend on their molecular rigidity. In concentrated solutions of the NPIs, intermolecular interactions were found to result in quenching of fluorescence. In contrast, upon aggregation (in THF:H2O mixtures), two of the NPIs show aggregation-induced-emission-enhancement (AIEE). The NPIs also show moderately high solid-state emission quantum yields (~10-12.7 %). The AIEE behaviors of the NPIs depend on their molecular rigidity and nature of intermolecular interactions. The NPIs (8-10) show different extents of intermolecular (π-π and C-H•••O) interactions in their solid-state structures depending on their substituents. Detailed photophysical, computational and structural investigations suggest that only an optimal balance of structural flexibility and intermolecular communication is the effective recipe for achieving AIEE characteristics in these NPIs.
Chapter 4 presents the design, synthesis and detailed investigations and potential applications of a series of NPI-BODIPY dyads (11-13). The NPI and BODIPY moieties in these dyads are electronically separated by oxoaryl bridges and the compounds only differ structurally with respect to methyl substitutions on the BODIPY fluorophore. The NPI and BODIPY moieties retain their optical features in these molecular dyads (11- 13). Dyads 11-13 show dual emission in solution state originating from the two separate fluorescent units. The variations of the dual emission in these compounds are controlled by the structural flexibility of the systems. The
dyads also show significant AIES (Aggregation-Induced-Emission Switching) features upon formation of nano-aggregates in THF-H2O mixtures with visual changes in emission from green to red color. Whereas the flexible and aggregation prone system (i.e. compound 11) shows aggregation-induced enhancement of emission, rigid systems with less favorable intermolecular interactions (i.e. compound 12-13) show aggregation-induced quenching of emission. The emission-intensity vs. the structural-flexibility correlations were found to be reverse in solution and aggregated states. Photophysical and structural investigations suggest that the intermolecular interactions (e.g. π-π stacking etc.) play major role in controlling emission of these compounds in aggregated states. Similar trends were also observed in the solid-state luminescence of these compounds. The applications of the luminescent dyads 11-13 as live-cell imaging dyes was also investigated.
Chapter 5 describes investigations of photophysical properties of a series of six BODIPY dyes (14-19) in which there is a systematic alteration of a common -C6H4Si(CH3)3 substituent. Inrelated constitutional isomers, the systematic increment of steric congestion and lowering of molecular symmetry around the BODIPY core result in a steady increment of
solution and solid- state fluorescence quantum yields. The increasing fluorescence quantum yields (solution, solid state) with increasing steric congestions show that the molecular free rotation and aggregation-induced fluorescence quenching of BODIPYs can be successfully suppressed by lowering the flexibility of the molecules. Photophysical and DFT investigations reveal that the electronic band gap in any set of these constitutional isomers remain almost similar. However, the crystal structures of the compounds reveal that the solid-state colour and quantum yields of the compounds in solid-state are also related to the nature of intermolecular interactions.
Chapter 6 demonstrates the use of DFT computational methods to understand the effect of alkyl groups in governing the basic structural and electronic aspects of BODIPY dyes. As demonstrated in Chapter 4 and Chapter 5, apparently electronically inactive alkyl groups can be of immense importance to control the overall photophysics of BODIPYs. In this context, a systematic strategy su was utilized considering all possible outcomes of constitutionally-isomeric molecules to understand the effects of alkyl groups on the BODIPY molecules. Four different computational methods were employed to ascertain the unanimity of the observed trends associated with the molecular properties. In line with experimental observations, it was found that alkyl substituents in BODIPY dyes situated at 3/5-positions effectively participate in stabilization as well as planarization of such molecules. Screening of all the possible isomeric molecular systems was used to understand the individual properties and overall effects of the typical alkyl substituents in controlling several basic properties of such BODIPY molecules.
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Hung, Chih-Chien, and 洪誌鍵. "The Novel pH-responsive Luminescent Electrospun Fibers Prepared From Random Copolymers: Synthesis, Morphology and Reversible Sensing Property." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/97q2w6.
Повний текст джерелаАнотація:
碩士國立臺北科技大學
有機高分子研究所
101
In this study, we prepared electrospun (ES) fiber from mulifunctional random copolymers of poly(HEMA-co-NMA-co-RhBAM). The moieties of HEMA, NMA and RhBAM were designed to the hydrophilic, chemical cross-linking (to ensure insolubility in aquesous), pH-responsive, respectively. The random copolymers were synthesized by free radical copolymerization of the above three kinds of moieties with the different mole ratio, and then prepared to form ES nanofibers using the different electronspinning parameters. It was observed that the variation of morphologies on different operated conditions from SEM. We explored the pH-responsive and photophysical properties of the ES fibers immersed in aqueous solvent with different pH value. The fluorescent emission of 580 nm was gradually increased with increasing concentration of pH from pH value of 7 to 2 for ES fibers due to the pH-responsive RhBAM moiety. In our study, we discovered the difference of efficiency for sensing on dissimilar ratio of the random copolymers. Due to the enhanced degree of cross-linking with increasing the NMA content, the cross-linked ES fibers of P2 have the unobvious swelling morphology. It resulted in the pH-sensing efficiency of P1 ES fibers are better than that of P2. The fluorescent intensity of P1 ES fiber exhibits around 90-fold enhancement at pH value of 2 while only 46-fold enhancement on P2 ES fiber. In addition, the ES fibers had a significant reversibility for pH-dependence and could be repeated for several times. Moreover, the ES fibers led a much better pH-response on the fiber morphology compared with the corresponding spin-coated film because of their high surface/volume. Above all results show that the multi-functional ES fiber have a potential in relative applications, such as filters, bio-sensor and sensory devices.
Частини книг з теми "Luminescent property"
1
Fujishiro, Fumito, Takuya Hashimoto, and Masashi Takahashi. "151Eu Mössbauer measurements of CuLa1 − x Eu x O2 with luminescent property." In ICAME 2011, 605–8. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-4762-3_103.
Повний текст джерела
2
He, Hong, Ren Li Fu, Xiu Feng Song, and De Liu Wang. "Luminescence Property of Eu2+ Doped Strontium Silicate Yellow Phosphor for White Light Emitting Diode." In High-Performance Ceramics V, 363–65. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.363.
Повний текст джерела
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Leto, Andrea, and Giuseppe Pezzotti. "Nano-Scale Stress Measurement and Property Characterization of Silica-Based Electro Optical Devices Using their Native Defects Luminescence." In Advances in Glass and Optical Materials II, 209–17. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144138.ch20.
Повний текст джерела
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Wu, Wen-Chia, Chung-Sung Yang, and Yan Xu. "Twist Tetrahedral-Tilting Structure Built from Photoluminescent Cadmium Chalcogenide Clusters." In Advanced Functional Materials. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92066.
Повний текст джерелаАнотація:
The newly synthesized cadmium chalcogenide ternary cluster is composed by six [S3Se]2− tetrahedron units, coordinated with six Cd2+ cations. The potential cavity, calculated by the PLATON program, occupied 38.1% of crystal cell volume. The charge of unit cell is neutral. Therefore, the unit cell formula is determinate as [Cd6S18Se6]. Two strong solid-state luminescence peaks, centered at 450 nm and 498 nm, were observed from the ternary [Cd6S18Se6] clusters by λ = 370 nm radiation. The 450 nm peak is due to the porosity property of cadmium chalcogenide clusters. However, the 498 nm peak has not been reported for the cadmium chalcogenide clusters before. In this study, we demonstrate that the 498 nm peak is attributed to the embedded Se atoms confined in the [S3Se]2− unit of [Cd6S18Se6] cluster. The luminescent output from the ternary [Cd8S18Se6] cluster is stable in room temperature for more than 6 months.
5
Chávez-García, Dalia, and Karla Juarez-Moreno. "Nanotoxicological Assessments of Upconversion Nanoparticles." In Toxicity of Nanoparticles - Recent Advances and New Perspectives. IntechOpen, 2024. http://dx.doi.org/10.5772/intechopen.111883.
Повний текст джерелаАнотація:
Upconversion nanoparticles (UCNPs) are highly efficient luminescent nanomaterials with emission in the visible spectra while being excited by near-infrared region light (NIR). With their unique properties such as high luminescence intensity, sharp emission peaks with narrow bandwidth, large anti-Stokes’ shift, and sizes smaller than 100 nm, UCNPs have emerged as promising candidates for diverse biomedical applications such as cancer detection and therapy, fluorescence imaging, magnetic resonance imaging (MRI), and drug delivery. The UCNPs are composed of a crystalline matrix doped with lanthanide ions that can absorb NIR light (~980 nm) and upconvert it to visible light. However, to achieve successful biomedical applications, proper functionalization, target-specific cell interaction, and biocompatibility are critical factors that must be considered. Additionally, a comprehensive nanotoxicological assessment is necessary to ensure that UCNPs are not cytotoxic or genotoxic. This assessment is particularly important for long-term studies of nanoparticles’ tracking in vivo. Therefore, this chapter aims to provide an in-depth evaluation of the nanotoxicological issues related to nanoparticles (NPs) and UCNPs in biomedical applications, and ensure their safety and efficacy as bioimaging and chemotherapeutic delivery tools.
6
Aitken, M. J. "Basic notions: radioactivity and irradiation." In An Introduction to Optical Dating, 37–59. Oxford University PressOxford, 1998. http://dx.doi.org/10.1093/oso/9780198540922.003.0003.
Повний текст джерелаАнотація:
Abstract It is not the intention to give a comprehensive discussion of radioactivity and irradiation, the reader being referred elsewhere (e.g. Aitken 1985; Berger 1988). However, a brief outline is appropriate, particularly since some characteristics of the radiation flux have a bearing on luminescence measurement procedures. It should be noted at the outset that in luminescence dating the radioactivity providing the natural dose-rate is long-lived compared with the sample age span. This is in contrast to radiometric dating proper, such as by radiocarbon, where the half-life must be comparable with the sample age span and the basis of dating is that the radioactive content of the sample changes with time.
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"Solvothermal method preparation of nano Y2O2S:Eu3+ and research of luminescence property and cytotoxicity." In Bioinformatics and Biomedical Engineering: New Advances, 231–36. CRC Press, 2015. http://dx.doi.org/10.1201/b19238-39.
Повний текст джерела
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"The luminescence property of Rhodamine B grafted in different structured channels of mesoporous silicate." In Advances in Future Manufacturing Engineering, 163–68. CRC Press, 2015. http://dx.doi.org/10.1201/b18474-32.
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Nayak, Debashish, and Ram Bilash Choudhary. "Conducting Polymer-Based Emissive Layer on Efficiency of OLEDs." In Light-Emitting Diodes and Photodetectors - Advances and Future Directions [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98652.
Повний текст джерелаАнотація:
Many changes have arisen in the world of display technologies as time has passed. In the vast area of display technology, Organic light-emitting diode is a recent and exciting discovery. Organic light-emitting diodes (OLEDs) have received a lot of curiosity among the researcher in recent years as the next generation of lighting and displays due to their numerous advantages, such as superior efficiency, mechanical flexibility and stability, chemical versatility, ease of fabrication, and so on. It works on the theory of electroluminescence, which is a mechanism in which electrical energy converts to light energy. Organic LEDs have a thickness of 100 to 500 nanometers or 200 times that of human hair. In OLEDs, organic material can be used in two or three layers. The emissive layer plays a key role in OLEDs. Polymers are used in the emissive layer to enhance the efficiency of OLEDs at the same time self-luminescence materials are used in OLEDs. In displays, this self-illuminating property removes the need for backlighting. Compared to LEDs and LCDs, OLED displays are smaller, lighter, and more portable.
Тези доповідей конференцій з теми "Luminescent property"
1
Gonzales, Joseph, Tatsunori Hayashi, and Hirotaka Sakaue. "Luminescent Ice Sensor for Internal Property Measurement During Impact." In AIAA Scitech 2021 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2021. http://dx.doi.org/10.2514/6.2021-1511.
Повний текст джерела
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Akiyama da Silva, Júlia, Leonardo De Boni, and Jones Limberger. "Unveiling Two-photon Absorption Property and Relationship with Brightness and Aggregation in Benzothiadiazoles." In Latin America Optics and Photonics Conference. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/laop.2022.w4a.6.
Повний текст джерелаАнотація:
Luminescent aryloxy-benzothiadiazole derivatives were studied and compared among them. The aim was to analyze the changes in photophysical properties through linear and nonlinear optics characterization due to the aggregate formation and applications in biological field.
3
Chen, C. Y., C. A. Lin, M. J. Chen, G. R. Lin, and J. H. He. "ZnO/Al2O3 core-shell nanorod arrays: Growth, structural characterization, and luminescent property." In 2010 IEEE 3rd International Nanoelectronics Conference (INEC). IEEE, 2010. http://dx.doi.org/10.1109/inec.2010.5424798.
Повний текст джерела
4
Sharma, Ankit, Mansi Pathak, C. S. Rout, and K. V. Adarsh. "Temperature-Dependent Light-Matter Interaction with Highly Luminescent High-Spin State in MnCo2O4." In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/fio.2023.jm7a.10.
Повний текст джерелаАнотація:
Crystal-field effect splits the degenerate d-orbit in transition metal to stabilize the molecular system. Here we exploit this intrinsic property to study electron-phonon interaction in optically less explored MnCo2O4 by temperature-dependent photoluminescence.
5
Case, G. G., and R. L. Zelmer. "Comparative Experiences in Environmental Remediation of LLR Waste Sites in Diverse Canadian Environments." In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4846.
Повний текст джерелаАнотація:
A variety of sites contaminated with legacy low-level radioactive (LLR) waste materials have been identified across Canada. Many of these sites, associated with former radium and uranium refining and processing operations, are located in urbanized areas of southern Ontario. However, other sites have been discovered at more remote locations in Canada, including northern Alberta and the Northwest Territories. The diversity of waste froms, ranging from pitchblende ore and processing wastes, to discarded luminescent products, combined with construction and transportation logistical issues encountered at these sites, present ongoing challenges for the Low-Level Radioactive Waste Management Office (LLRWMO) to overcome in meeting its mandate to resolve these legacy problems. Since its establishment in 1982, the federal government’s LLRWMO has operated programs to characterize and delineate contaminated historic waste sites across Canada. These programs have included undertaking property decontaminations, waste consolidation and interim storage projects at many sites, and participating with federal and provincial government departments and local communities to consider long-term storage and disposal opportunities. This paper compares four specific environmental remediation programs conducted by the LLRWMO within diverse Canadian settings found at Port Hope and Toronto (southern Ontario), Fort McMurray (northern Alberta), and Vancouver (west coast of British Columbia). Contaminant characterization and delineation, and remediation plan design and implementation aspects of these individual programs span the time period from the early 1980s through to 2002. The individual programs dealt with a variety of legacy waste forms that contained natural radioactive materials such as radium-226, total uranium, total thorium and thorium-230, as well as coincidental inorganic contaminants including arsenic, barium, cadmium, cobalt, lead, mercury, vanadium and zinc. Application of the lessons learned during these individual programs, as well as the development of new and innovative technologies to meet the specific needs of these programs, have enabled the LLRWMO to effectively and efficiently implement environmental remediation solutions that address the variety of Canada’s legacy LLR wastes.introduction.
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Gadkari, S. C., Seema Shinde, G. D. Patra, S. G. Singh, and Shashwati Sen. "Effect of film thickness on luminescence property of CsI: Tl." In INDIAN VACUUM SOCIETY SYMPOSIUM ON THIN FILMS: SCIENCE AND TECHNOLOGY. AIP, 2012. http://dx.doi.org/10.1063/1.4732381.
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Chen, Z., G. D. Xu, X. L. He, M. M. Wang, C. Q. He, J. Zou, and S. W. Xin. "Luminescence Property of Eu3+-doped CaZrSi2O7 Phosphors for White LEDs." In Proceedings of the 2019 International Conference on Modeling, Analysis, Simulation Technologies and Applications (MASTA 2019). Paris, France: Atlantis Press, 2019. http://dx.doi.org/10.2991/masta-19.2019.73.
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Wang, Lili, Shanshan Huang, Mingchun Li, Lianli Liu, and Xibao Yang. "Hydrothermal synthesis and luminescence property of tetragonal LaVO4:Eu3+ sheaves." In 2018 33rd Youth Academic Annual Conference of Chinese Association of Automation (YAC). IEEE, 2018. http://dx.doi.org/10.1109/yac.2018.8406539.
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Chen, Lei, Gang Jing, Yan Liu, and Jintian Lin. "Study on preparation mechanism and luminescence property of CaAlSiN3: Eu phosphor." In 2021 International Conference on Laser, Optics and Optoelectronic Technology, edited by Changsi Peng and Fengjie Cen. SPIE, 2021. http://dx.doi.org/10.1117/12.2602405.
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Que, R., L. Houel-Renault, M. Temagoult, M. Lancry, K. Kalli, and B. Poumellec. "Photoluminescence Creation in CYTOP Optical Fiber by Femtosecond Laser Direct Writing." In Bragg Gratings, Photosensitivity and Poling in Glass Waveguides and Materials. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/bgppm.2022.bm3a.3.
Повний текст джерелаАнотація:
Spatial-selective photoluminescence in visible range was induced in the core of CYTOP fibers by femtosecond laser direct writing. This implemented optical property may have potential applications for luminescence-based fiber sensing for biomedical and environmental fields