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Artykuły w czasopismach na temat „Photoluminescence”

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Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 31 lipca 2024

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1

Liu, Qing, Lu Liu, Cao-Ming Yu, Pei-Xin Li i Guo-Cong Guo. "Two viologen-based photoluminescent compounds: excitation-wavelength-dependent and photoirradiation-time-dependent photoluminescent switches". CrystEngComm 23, nr 21 (2021): 3856–60. http://dx.doi.org/10.1039/d1ce00072a.

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We synthesized two isostructural multi-coloured photoluminescent coordination polymers. They exhibit excitation-wavelength-dependent photoluminescence emission and photoirradiation-time-dependent photoluminescence emission in solid-state.

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2

Zhang, Hua, Jun Cheng Liu i Jiao Li. "Research on Photoluminescence Characteristics of the Active Cl-Doped ZnS". Advanced Materials Research 284-286 (lipiec 2011): 2276–79. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.2276.

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A active Cl-doping for photoluminescent ZnS powder has been carried out by thermal decomposed AlCl3·6H2O in a quartz tube. Room temperature photoluminescence of the Cl-doped ZnS powder has been investigated using a photoluminescence spectrometer with 365 nm excitation wave length. A strong blue photoluminescence with maximum peak about 450 nm and green photoluminescence with maximum peak about 500 nm can be observed if the doping temperature in range of 800 ~ 900 °C and 1100 ~1200 °C, respectively. The structural characterizations of the Cl-doped ZnS powders were performed with X-ray diffraction (XRD) and the mechanism of photoluminescence was preliminarily discussed.

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Гагис, Г. С., А. С. Власов, Р. В. Левин, А. Е. Маричев, М. П. Щеглов, Т. Б. Попова, Б. Я. Бер i in. "Люминесцентные свойства выращенных на InP слоев GaInAsP с градиентом состава по толщине". Письма в журнал технической физики 45, nr 20 (2019): 22. http://dx.doi.org/10.21883/pjtf.2019.20.48388.17954.

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The photoluminescent properties at 77 and 300 K are investigated for Ga1 xInxAsyP1 y epilayers with V-group elements content gradient Δy up to 0.08 across whole thickness (about 1 µm). Ga1 xInxAsyP1 y layers with high Δy values have widened photoluminescence spectra. For GaInAsP layers of low crystaline perfection, photoluminescence was either absent or manifested itself as it is typical for transitions involving impurity levels.

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4

Мазинг, Д. С., Н. М. Романов, В. А. Мошников, О. А. Александрова i О. А. Корепанов. "Исследование спектров фотолюминесценции нанокристаллов AgInS-=SUB=-2-=/SUB=-/ZnS при воздействии γ-излучения". Письма в журнал технической физики 45, nr 21 (2019): 34. http://dx.doi.org/10.21883/pjtf.2019.21.48471.17948.

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The effect of different doses of γ-radiation from a 137Cs source on photoluminescence of Ag-In-S nanocrystals covered with a shell of wider bandgap ZnS was investigated. The dynamics of changes in the nanocrystals photoluminescence depending on the dose of γ-radiation was shown. It was established that the AgInS2 / ZnS nanoparticles retain their photoluminescent properties and colloidal stability upon reaching the absorbed dose of 6 • 10^3 Gy (to water). Residual photoluminescence persisted when the absorbed dose reached 10^6 Gy. It was shown that AgInS2 / ZnS nanocrystals can be used in medical and biological studies in which increased resistance to gamma radiation is needed.

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5

Han, Lei, Shi Gang Liu, Jiang Xue Dong, Jia Yu Liang, Ling Jie Li, Nian Bing Li i Hong Qun Luo. "Facile synthesis of multicolor photoluminescent polymer carbon dots with surface-state energy gap-controlled emission". J. Mater. Chem. C 5, nr 41 (2017): 10785–93. http://dx.doi.org/10.1039/c7tc03314a.

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6

Pan, Xiaoyong, Wei Ren, Liuqun Gu, Guan Wang i Ye Liu. "Photoluminescence from Chitosan for Bio-Imaging". Australian Journal of Chemistry 67, nr 10 (2014): 1422. http://dx.doi.org/10.1071/ch14274.

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Photoluminescent behaviours of chitosan were investigated. Photoluminescence can be observed from aqueous solution of chitosan, and CO2 treatment can improve the intensity of photoluminescence. The maximum emission is obtained with an excitation at ~336 nm, and the emission wavelength is dependent on the excitation wavelength with a longer excitation wavelength leading to a longer emission wavelength. The chemistry of chitosan before and after CO2 treatment was characterised; and the results reflect that carbamato anion is formed via the reaction between the amines and CO2, and is the fluorophore of the photoluminescence observed. Furthermore, chitosan was applied as an imaging agent for imaging MCF-7 cells using confocal microscopy. Blue and bright green imaging of the cells can be obtained via tuning the excitation and emission wavelength. Together with a low cytotoxicity reflected by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide evaluation, fluorescent chitosan is promising for bio-imaging.

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7

Wang, Ze-Ping, Jin-Yun Wang, Jian-Rong Li, Mei-Ling Feng, Guo-Dong Zou i Xiao-Ying Huang. "[Bmim]2SbCl5: a main group metal-containing ionic liquid exhibiting tunable photoluminescence and white-light emission". Chemical Communications 51, nr 15 (2015): 3094–97. http://dx.doi.org/10.1039/c4cc08825e.

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8

Song, Tianming, Yawei Qu, Zhe Ren, Shuang Yu, Mingjian Sun, Xiaoyu Yu i Xiaoyang Yu. "Synthesis and Characterization of Polyvinylpyrrolidone-Modified ZnO Quantum Dots and Their In Vitro Photodynamic Tumor Suppressive Action". International Journal of Molecular Sciences 22, nr 15 (28.07.2021): 8106. http://dx.doi.org/10.3390/ijms22158106.

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Despite the numerous available treatments for cancer, many patients succumb to side effects and reoccurrence. Zinc oxide (ZnO) quantum dots (QDs) are inexpensive inorganic nanomaterials with potential applications in photodynamic therapy. To verify the photoluminescence of ZnO QDs and determine their inhibitory effect on tumors, we synthesized and characterized ZnO QDs modified with polyvinylpyrrolidone. The photoluminescent properties and reactive oxygen species levels of these ZnO/PVP QDs were also measured. Finally, in vitro and in vivo experiments were performed to test their photodynamic therapeutic effects in SW480 cancer cells and female nude mice. Our results indicate that the ZnO QDs had good photoluminescence and exerted an obvious inhibitory effect on SW480 tumor cells. These findings illustrate the potential applications of ZnO QDs in the fields of photoluminescence and photodynamic therapy.

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9

Хайдуков, К. В., И. В. Крылов, М. Е. Николаева, В. В. Рочева i Е. В. Хайдуков. "Наночастицы NaLuF-=SUB=-4-=/SUB=-: Yb-=SUP=-3+-=/SUP=-, Er-=SUP=-3+-=/SUP=-, Ce-=SUP=-3+-=/SUP=- для создания компактных волноводных усилителей и визуализации в ближнем ИК диапазоне спектра". Оптика и спектроскопия 131, nr 5 (2023): 655. http://dx.doi.org/10.21883/os.2023.05.55718.75-22.

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Fluoride nanocrystals co-doped with lanthanide ions are well known due to the possibility of conversion near-infrared (NIR) radiation into photoluminescence with large anti-Stokes shift. Owing to upconversion effect, such nanomaterials have shown great potential in photonics and biomedicine. However, fluoride nanoparticles can be reconfigured to photoluminescence with a Stokes shift into the near-infrared region of the spectrum. In this work, we focused on the properties of NaRF4: Yb3+, Er3+, Ce3+ (R = Y, Lu) nanoparticles exhibiting intense stokes luminescence in the vicinity of 1530 nm at 975 nm excitation. Photoluminescence quantum efficiency of synthesized nanoparticles was evaluated as 28% at 0.6 W/cm2 excitation intensity. Based on the photoluminescent properties of nanoparticles we designed compact waveguide amplifier for C-band telecommunication and developed time gated imaging system for NIR-to-NIR biovisualization.

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10

Hrytsenko, Olha, Dmytro Hrytsenko, Vitaliy Shvalagin, Galyna Grodziuk i Mikhail Kompanets. "The Use of Carbon Nanoparticles for Inkjet-Printed Functional Labels for Smart Packaging". Journal of Nanomaterials 2018 (2.07.2018): 1–10. http://dx.doi.org/10.1155/2018/6485654.

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Smart packaging functions can be provided by printing functional labels onto packaging materials using inkjet printing and inks with changeable photoluminescence properties. Carbon nanoparticles are considered a perspective fluorescent component of such inks. Ink compositions based on carbon nanoparticles are developed and adapted for inkjet printing on paper packaging materials for producing smart packaging labels. The influence of technological factors of the printing process on the photoluminescence characteristics of the printed images is investigated. The main investigated factors are the concentration of carbon nanoparticles, the relative area of raster elements of a raster field of a tone image, the absorbance and surface smoothness of paper. The resulting parameters are photoluminescence intensity and color. It is found that in case of changes in surface smoothness and absorbance of paper and concentrations of carbon nanoparticles in the ink compositions, the photoluminescence intensity of a printed image changes while its photoluminescence color remains the same. To obtain the highest contrast of tone inkjet-printed images with carbon nanoparticles on papers with any absorbance, the highest concentration of carbon nanoparticles in the ink composition should be used. However, the highest contrast and the highest own photoluminescence intensity of a tone inkjet-printed image with inks with carbon nanoparticles can be achieved only on papers with the lowest absorbance. The most noticeable difference between photoluminescence intensity of printed images on papers with any absorbance can be obtained with the lower concentration of carbon nanoparticles in the ink composition (10 mg/mL). The optimum concentrations of carbon nanoparticles in the composition are determined: for papers with low absorbance—10 mg/mL, and for papers with medium and high absorbance—25 mg/mL. Analytical dependency is created for photoluminescence intensity of images printed with inkjet printing inks with carbon nanoparticles as a function of the studied technological factors. Some design solutions for photoluminescent labels are suggested.

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11

Sagara, Yoshimitsu, Tatsuya Muramatsu i Nobuyuki Tamaoki. "A 1,6-Diphenylpyrene-Based, Photoluminescent Cyclophane Showing a Nematic Liquid-Crystalline Phase at Room Temperature". Crystals 9, nr 2 (11.02.2019): 92. http://dx.doi.org/10.3390/cryst9020092.

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Photoluminescent nematic liquid crystals have been an attractive research target for decades, because of their potential applications in optoelectrical devices. Integration of luminescent motifs into cyclic structures is a promising approach to induce low-ordered liquid-crystalline phases, even though relatively large and rigid luminophores are used as emitters. Here, we demonstrate a 1,6-diphenylpyrene-based, unsymmetric cyclophane showing a stable nematic phase at room temperature and exhibiting strong photoluminescence from the condensed state. The observed sky-blue photoluminescence was dominated by the emission species ascribed to assembled luminophores rather than monomers.

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12

Lu, Chung Hsin, Chien Hao Huang, Chung Tao Chen, Sheng Min Wang, Shu Jiuan Huang, Dorcas Zhang i Ramakant Kadam. "Sol-Gel Preparation and Characterizations of Europium-Ion Doped Barium Magnesium Aluminate". Key Engineering Materials 317-318 (sierpień 2006): 93–96. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.93.

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The photoluminescent properties of BaMgAl10O17: Eu2+ synthesized via a sol-gel process employing citric acid (CA) and ethylene glycol (EG) were investigated in this study. The photoluminescence intensity of Eu2+ emission increased with increase in the doping concentration of Eu2+ up to 15 at %. The photoluminescence intensity of BaMgAl10O17: Eu2+ also varied with the EG: CA ratio. SEM investigation indicates that the sol-gel derived particles exhibited an irregular shape. The EPR studies showed that Eu2+ ions occupied the sites with non-cubic symmetry in the prepared phosphors.

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13

Rauwel, Protima, Martin Salumaa, Andres Aasna, Augustinas Galeckas i Erwan Rauwel. "A Review of the Synthesis and Photoluminescence Properties of Hybrid ZnO and Carbon Nanomaterials". Journal of Nanomaterials 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/5320625.

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Photoluminescent ZnO carbon nanomaterials are an emerging class of nanomaterials with unique optical properties. They each, ZnO and carbon nanomaterials, have an advantage of being nontoxic and environmentally friendly. Their cost-effective production methods along with simple synthesis routes are also of interest. Moreover, ZnO presents photoluminescence emission in the UV and visible region depending on the synthesis routes, shape, size, deep level, and surface defects. When combined with carbon nanomaterials, modification of surface defects in ZnO allows tuning of these photoluminescence properties to produce, for example, white light. Moreover, efficient energy transfer from the ZnO to carbon nanostructures makes them suitable candidates not only in energy harvesting applications but also in biosensors, photodetectors, and low temperature thermal imaging. This work reviews the synthesis and photoluminescence properties of 3 carbon allotropes: carbon quantum or nanodots, graphene, and carbon nanotubes when hybridized with ZnO nanostructures. Various synthesis routes for the hybrid materials with different morphologies of ZnO are presented. Moreover, differences in photoluminescence emission when combining ZnO with each of the three different allotropes are analysed.

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14

Danilov, Pavel, Evgeny Kuzmin, Elena Rimskaya, Jiajun Chen, Roman Khmelnitskii, Alexey Kirichenko, Nikolay Rodionov i Sergey Kudryashov. "Up/Down-Scaling Photoluminescent Micromarks Written in Diamond by Ultrashort Laser Pulses: Optical Photoluminescent and Structural Raman Imaging". Micromachines 13, nr 11 (1.11.2022): 1883. http://dx.doi.org/10.3390/mi13111883.

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Elongated photoluminescent micromarks were inscribed inside a IaAB-type natural diamond in laser filamentation regime by multiple 515 nm, 0.3 ps laser pulses tightly focused by a 0.25 NA micro-objective. The micromark length, diameter and photoluminescence contrast scaled as a function of laser pulse energy and exposure, coming to a saturation. Our Raman/photoluminescence confocal microscopy studies indicate no structural diamond damage in the micromarks, shown as the absent Raman intensity variation versus laser energy and exposition along the distance from the surface to the deep mark edge. In contrast, sTable 3NV (N3)-centers demonstrate the pronounced increase (up to 40%) in their 415 nm zero-phonon line photoluminescence yield within the micromarks, and an even higher—ten-fold—increase in NV0-center photoluminescence yield. Photogeneration of carbon Frenkel “interstitial–vacancy” (I–V) pairs and partial photolytic dissociation of the predominating 2N (A)-centers were suggested to explain the enhanced appearance of 3NV- and NV-centers, apparently via vacancy aggregation with the resulting N (C)-centers or, consequently, with 2N- and N-centers.

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15

Basu, Aniruddha, Anil Suryawanshi, Begraj Kumawat, Anshu Dandia, Debanjan Guin i Satishchandra B. Ogale. "Starch (Tapioca) to carbon dots: an efficient green approach to an on–off–on photoluminescence probe for fluoride ion sensing". Analyst 140, nr 6 (2015): 1837–41. http://dx.doi.org/10.1039/c4an02340d.

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Photoluminescent carbon dots are synthesized from starch (Tapioca) and are shown to work effectively as anion-selective fluoride ion probes based on Fe³⁺ induced photoluminescence quenching and F⁻ induced recovery.

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16

Gao, Qiang, Xing Li, Guo-Hong Ning, Kai Leng, Bingbing Tian, Cuibo Liu, Wei Tang, Hai-Sen Xu i Kian Ping Loh. "Highly photoluminescent two-dimensional imine-based covalent organic frameworks for chemical sensing". Chemical Communications 54, nr 19 (2018): 2349–52. http://dx.doi.org/10.1039/c7cc09866a.

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Highly photoluminescent imine-based 2D-COFs with high photoluminescence quantum yields (up to 21.1%) were achieved by integrating a non-planar building unit with a pyrene-based unit and transforming the COF into spherical, sub-micron particles.

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17

Li, Chi-Lin, Chih-Ching Huang, Arun Prakash Periasamy, Prathik Roy, Wei-Cheng Wu, Chia-Lun Hsu i Huan-Tsung Chang. "Synthesis of photoluminescent carbon dots for the detection of cobalt ions". RSC Advances 5, nr 3 (2015): 2285–91. http://dx.doi.org/10.1039/c4ra11704b.

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Photoluminescent carbon dots (C-dots) were prepared from l-cysteine through a simple hydrothermal process and used for selective detection of cobalt ions (Co²⁺), based on analyte induced aggregation and photoluminescence quenching of C-dots.

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18

Kitada, Nobuo, i Takayuki Ishida. "Polymeric one- and two-dimensional copper(i) iodide complexes showing photoluminescence tunable by azaaromatic ligands". CrystEngComm 16, nr 34 (2014): 8035–40. http://dx.doi.org/10.1039/c4ce01231c.

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Photoluminescent properties of four low-dimensional [(CuI)_xL]_n complexes were investigated in the solid state at ambient temperature. A photoluminescence quantum yield of 73% was recorded for [(CuI)₂(46dmpm)]_n.

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19

Vokhmintsev, A. S. "Photoluminescence characterization of AlN nanowhiskers". Functional materials 21, nr 1 (30.03.2014): 21–25. http://dx.doi.org/10.15407/fm21.01.021.

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20

Skripka, A., A. Morinvil, M. Matulionyte, T. Cheng i F. Vetrone. "Advancing neodymium single-band nanothermometry". Nanoscale 11, nr 23 (2019): 11322–30. http://dx.doi.org/10.1039/c9nr02801c.

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Nd³⁺ doped LiLuF₄ nanoparticles are explored as photoluminescent nanothermometers and imaging probes. Such host-dopant configuration permits to resolve the fine Stark structure of Nd³⁺ photoluminescence at 1050 nm, and to use it for subcutaneous temperature sensing.

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21

Huang, Yuan Ming, Bao Gai Zhai i Qing Lan Ma. "Anodization Current Density Independent Photoluminescence of Porous Silicon". Key Engineering Materials 538 (styczeń 2013): 85–88. http://dx.doi.org/10.4028/www.scientific.net/kem.538.85.

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Porous silicon (PS) is usually prepared by means of the anodization under constant current density, and fabrication of PS is a key step towards the realization of all-silicon electronic devices. It is a general belief that the photoluminescent properties of electrochemically etched PS depend on the anodization current density. In this work, we electrochemically prepared a series of PS films in the electrolyte of hydrofluoric acid by varying anodizing current density in the range of 1-70 mA/cm2. In spite of the different anodizing current density, the peak wavelength of the photoluminescence spectrum of the electrochemically anodized PS does not depend on the anodization current density. SEM has been utilized to characterize the morphology of the prepared PS films, and the mechanism is discussed for the anodization current independent photoluminescence of PS.

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22

Park, W. S., S. J. Kim i Ji Soon Kim. "Photoluminescence Properties of Ba-Substituted SrAl₂O₄:Eu Phosphor". Materials Science Forum 449-452 (marzec 2004): 745–48. http://dx.doi.org/10.4028/www.scientific.net/msf.449-452.745.

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The synthesis of Sr1-XBaXAl2O4 :Eu 2+ (x = 0, 0.1, 0.2 and 0.3 mol) phosphor and its properties of photoluminescence and long-phosphorescence were investigated as a function of sintering condition. The single phase of SrAl2O4 was obtained by sintering the mixtures of SrCO3, BaCO3, Eu2 O3, Al2O3 and 3wt% B2 O3 powders over 1100°C in Ar/H2 atmosphere. Stuctural properties were analyzed by a X-ray diffractometer, microstructural properties by a SEM, and photoluminescent properties by a PL measuring system. The optimum sintering condition for the long-phosphorescent phosphor of Sr1-XBaXAl2O4:Eu2+ was found at 1400 °C. Substitution of Ba about 0.2mol in SrAl2O4 :Eu 2+ enhanced the photoluminescence and long-phosphorescence.

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23

Kumar, Sanjeev, Garima Jain, B. P. Singh i S. R. Dhakate. "Tunable Photoluminescence of Polyvinyl Alcohol Electrospun Nanofibers by Doping of NaYF4: Eu+3 Nanophosphor". Journal of Nanomaterials 2020 (4.03.2020): 1–8. http://dx.doi.org/10.1155/2020/1023589.

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NaYF4: Eu+3 nanophosphor/polyvinyl alcohol (PVA) composite nanofibers have been successfully fabricated using the electrospinning technique. The electrospun polymeric nanofibers were characterized by scanning electron microscopy (SEM), high-resolution transmission microscopy (HRTEM), X-ray diffraction (XRD), photoluminescence (PL), and Raman spectroscopy. The flexible polymeric mats exhibited strong red emission at 724 nm at excitation wavelength of 239 nm. 5% concentration of NaYF4: Eu+3 nanophosphor are embedded homogenously inside the PVA matrix. The strong red emission peak attributed to the presence of Eu+3 ions. The characterization of the mats confirmed the uniform dispersion and tunable photoluminescence properties. These photoluminescent nanofibers (PLNs) could be easily fabricated and potentially useful in solid-state lighting applications.

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24

Li, Yong-Fang, Ming Zhang, Qi-Jing Yang, Feng-Xian Zhang, Mei-Qi Zheng i Ai-Jun Wang. "A Simple and Facile Solvothermal Synthesis of Hierarchical PbS Microstars with Multidendritic Arms and Their Optical Properties". Journal of Nanoscience 2015 (11.02.2015): 1–9. http://dx.doi.org/10.1155/2015/362023.

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A simple and facile approach was developed in the solvothermal synthesis of hierarchical PbS microstars with multidendritic arms, which were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and photoluminescence (PL) spectroscopy. The morphologies of PbS products were strongly determined by the reaction time and temperature, the ratios of the precursors, and the mixed solvent with various components, and thereby their possible formation mechanism was discussed in some detail. The as-prepared PbS crystals displayed a sharp and strong photoluminescent peak at 437 nm at room temperature. It has potential and practical applications in photoluminescence, photovoltaics, IR photodetectors, electroluminescence, and solar absorbers.

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Mahmood, Layth Shakir, Gulsin Arslan, Idris Sargin i Serdar Karakurt. "Fluorescence Cell Imaging by Carbon Quantum Dots Derived from the Medicinal Plant Malva Sylvestris". Cumhuriyet Science Journal 45, nr 1 (31.01.2024): 73–79. http://dx.doi.org/10.17776/csj.1333574.

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Carbon quantum dots (CQDs) derived from biological samples exhibit low cytotoxicity and are often used as fluorescent agents for bioimaging cells or bacteria. In this study, fluorescent CQDs derived from Malva sylvestris, a wild edible medicinal plant (common mallow), were used to visualize the human epithelial cells (PNT1A). CQDs with strong blue photoluminescence were synthesized by microwave irradiation of dried M. sylvestris in water. CQDs' structural, morphological, surface features and photoluminescence properties were evaluated. In vitro, cytotoxicity assays revealed that carbon quantum dots from M. sylvestris have no cytotoxic effects on human epithelial cells. Non-cytotoxic and high photoluminescent CQDs from M. sylvestris can be exploited in bioimaging applications as a fluorophore agent

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Bhat, Swetha S. M., Ashfia Huq, Diptikanta Swain, Chandrabhas Narayana i Nalini G. Sundaram. "Photoluminescence tuning of Na1−xKxNdW2O8 (0.0 ≤ x ≤ 0.7) nanoparticles: synthesis, crystal structure and Raman study". Phys. Chem. Chem. Phys. 16, nr 35 (2014): 18772–80. http://dx.doi.org/10.1039/c4cp02176b.

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K⁺ ion substitution in Na site of NaNdW₂O₈ results in blue shift, inhomogeneous broadening and enhanced photoluminescent intensity. Nd–O–W bond angle, local disorder and difference in ionic radius are responsible for the observed difference in photoluminescence properties.

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Muravitskaya, A. O., L. L. Trotsiuk, O. S. Kulakovich, L. I. Gurinovich, S. V. Gaponenko i A. V. Antanovich. "Refractive Index Influence on the Quantum Dots Fluorescence Near the Gold Nanorods". International Journal of Nanoscience 18, nr 03n04 (26.03.2019): 1940003. http://dx.doi.org/10.1142/s0219581x19400039.

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Photoluminescent properties of CdSe/ZnS nanocrystals (quantum dots, QDs) in complexes with elongated gold nanoparticles was found to be dependent on the effective refractive index of the medium. It has been experimentally shown that changes in the refractive index make possible to increase the photoluminescence intensity by several times.

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Qin, Tian, Timothy Gutu, Jun Jiao, Chih-Hung Chang i Gregory L. Rorrer. "Photoluminescence of Silica Nanostructures from Bioreactor Culture of Marine Diatom Nitzschia frustulum". Journal of Nanoscience and Nanotechnology 8, nr 5 (1.05.2008): 2392–98. http://dx.doi.org/10.1166/jnn.2008.241.

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The marine diatom Nitzschia frustulum is a single-celled photosynthetic organism that uses soluble silicon as the substrate to fabricate intricately patterned silica shells called frustules consisting of 200 nm diameter pores in a rectangular array. Controlled photobioreactor cultivation of the N. frustulum cell suspension to silicon starvation induced changes in the nanostructure of the diatom frustule, which in turn imparted blue photoluminescence (PL) to the frustule biosilica. The photoluminescent properties were imbedded within a patterned substrate precisely ordered at the nano, submicron and microscales. The peak PL intensity increased by a factor of 18 from the mid-exponential to late stationary phase of the cultivation cycle, and the peak PL wavelength increased from 440 to 500 nm. TEM analysis revealed that the emergence of blue photoluminescence was associated with the appearance of fine structures on the frustule surface, including 5 nm nanopore arrays lining the base of the frustule pores, which were only observed at the late stationary phase when both silicon consumption and cell division were complete for two photoperiods. Photoluminescence was quenched by thermal annealing of diatom biosilica in air at 800 °C for 1.0 hr, commensurate with the loss of silanol (≡Si-OH)groups on the diatom biosilica, as confirmed by FT-IR. Consequently, the likely origin of blue photoluminescence in the diatom biosilica was from surface silanol groups and their distribution on the frustule fine structures.

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Liu, Bi Tao, i Lin Lin Peng. "Photoluminescent Properties of Na⁺, Bi³⁺ Co-Doped CaWO₄: Eu³⁺ Phosphor for PDPs". Applied Mechanics and Materials 341-342 (lipiec 2013): 229–32. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.229.

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The photoluminescent properties of Na, Bi co-doped CaWO4:Eu3+ phosphor under vacuum ultraviolet (VUV) region excited was investigated. A red emission of CaWO4:Eu3+ can be observed under 147 nm excitation. It was also found that the photoluminescence intensity of Na doped CaWO4:Eu3+ would be enhanced than the un-doped phosphors due to Na+ ions would act as a charge compensator and it can restrict the generation of defects in CaWO4:Eu3+. Additionally, the photoluminescence enhancement of Na+, Bi3+ co-doped CaWO4:Eu3+ should due to the energy transfer between WO42-, Bi3+ and Eu3+, and Bi3+ ions would act as a medium for the energy transfer, via WO42-Bi3+Eu3+. These are expected to be applying in plasma display panels.

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Kumar, Sanjeev, Garima Jain, Kuldeep Kumar, Ashish Gupta, J. S. Tawale, B. P. Singh, S. R. Dhakate i P. D. Sahare. "Stress-Induced Structural Phase Transition in Polystyrene/NaYF4: Eu3+ Photoluminescent Electrospun Nanofibers". Journal of Nanomaterials 2022 (13.04.2022): 1–10. http://dx.doi.org/10.1155/2022/2173629.

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Polystyrene (PS) composite nanofibers were successfully fabricated by embedding NaYF4: Eu3+ nanophosphor into the PS matrix via electrospinning. The photoluminescence spectra, surface morphology and crystal structure of nanofibers were characterized by photoluminescence spectroscopy, scanning electron microscopy, and X-ray diffractometer, respectively. Stress-induced α-NaYF4: Eu3+ (cubic) to β-NaYF4: Eu3+(hexagonal) structural phase transformation was observed in the nanofibers. The stress-induced phase transformation provides enough space for tailoring the properties of novel nanostructures. The composite nanofibers exhibited blue emission with 239 nm excitation wavelength. The XRD pattern of espun nanofibers confirmed the successful incorporation of 5% NaYF4: Eu3+ nanophosphors into the PS matrix. Brilliant values of the chromaticity coordinates of the prepared photoluminescent nanofibers (PLNs) predict their possible use in blue solid-state lighting applications.

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Ćulubrk, Sanja, Željka Antić, Vesna Lojpur, Milena Marinović-Cincović i Miroslav D. Dramićanin. "Sol-Gel Derived Eu3+-Doped Gd2Ti2O7Pyrochlore Nanopowders". Journal of Nanomaterials 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/514173.

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Herein we presented hydrolytic sol-gel synthesis and photoluminescent properties of Eu3+-doped Gd2Ti2O7pyrochlore nanopowders. According to Gd2Ti2O7precursor gel thermal analysis a temperature of 840°C is identified for the formation of the crystalline pyrochlore phase. Obtained samples were systematically characterized by powder X-ray diffraction, scanning and transmission electron microscopy, and photoluminescence spectroscopy. The powders consist of well-crystalline cubic nanocrystallites of approximately 20 nm in size as evidenced from X-ray diffraction. The scanning and transmission electron microscopy shows that investigated Eu3+-doped Gd2Ti2O7nanopowders consist of compact, dense aggregates composed entirely of nanoparticles with variable both shape and dimension. The influence of Eu3+ions concentration on the optical properties, namely, photoluminescence emission and decay time, is measured and discussed. Emission intensity as a function of Eu3+ions concentration shows that Gd2Ti2O7host can accept Eu3+ions in concentrations up to 10 at.%. On the other hand, lifetime values are similar up to 3 at.% (~2.7 ms) and experience decrease at higher concentrations (2.4 ms for 10 at.% Eu3+). Moreover, photoluminescent spectra and lifetime values clearly revealed presence of structural defects in sol-gel derived materials proposing photoluminescent spectroscopy as a sensitive tool for monitoring structural changes in both steady state and lifetime domains.

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Olsthoorn, S. M., F. A. J. M. Driessen, A. P. A. M. Eijkelenboom i L. J. Giling. "Photoluminescence and photoluminescence excitation spectroscopy of Al0.48In0.52As". Journal of Applied Physics 73, nr 11 (czerwiec 1993): 7798–803. http://dx.doi.org/10.1063/1.353953.

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Krustok, J., H. Collan, K. Hjelt, M. Yakushev, A. E. Hill, R. D. Tomlinson, H. Mändar i H. Neumann. "Photoluminescence and photoluminescence excitation study of CuGaTe2". Journal of Applied Physics 83, nr 12 (15.06.1998): 7867–72. http://dx.doi.org/10.1063/1.367963.

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Tetyorkin, V. V. "Photoluminescence studies of CdTe polycrystalline films". Semiconductor Physics Quantum Electronics and Optoelectronics 15, nr 4 (12.12.2012): 340–44. http://dx.doi.org/10.15407/spqeo15.04.340.

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Sprincean, Veaceslav, Liviu Leontie, Iuliana Caraman, Oleg Lupan, Rainer Adeling, Silviu Gurlui, Aurelian Carlescu, Corneliu Doroftei i Mihail Caraman. "Preparation, Chemical Composition, and Optical Properties of (β–Ga2O3 Composite Thin Films)/(GaSxSe1−x Lamellar Solid Solutions) Nanostructures". Nanomaterials 13, nr 14 (11.07.2023): 2052. http://dx.doi.org/10.3390/nano13142052.

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GaSxSe1−x solid solutions are layered semiconductors with a band gap between 2.0 and 2.6 eV. Their single crystals are formed by planar packings of S/Se-Ga-Ga-S/Se type, with weak polarization bonds between them, which allows obtaining, by splitting, plan-parallel lamellae with atomically smooth surfaces. By heat treatment in a normal or water vapor-enriched atmosphere, their plates are covered with a layer consisting of β–Ga2O3 nanowires/nanoribbons. In this work, the elemental and chemical composition, surface morphology, as well as optical, photoluminescent, and photoelectric properties of β–Ga2O3 layer formed on GaSxSe1−x (0 ≤ x ≤ 1) solid solutions (as substrate) are studied. The correlation is made between the composition (x) of the primary material, technological preparation conditions of the oxide-semiconducting layer, and the optical, photoelectric, and photoluminescent properties of β–Ga2O3 (nanosized layers)/GaSxSe1−x structures. From the analysis of the fundamental absorption edge, photoluminescence, and photoconductivity, the character of the optical transitions and the optical band gap in the range of 4.5–4.8 eV were determined, as well as the mechanisms behind blue-green photoluminescence and photoconductivity in the fundamental absorption band region. The photoluminescence bands in the blue-green region are characteristic of β–Ga2O3 nanowires/nanolamellae structures. The photoconductivity of β–Ga2O3 structures on GaSxSe1−x solid solution substrate is determined by their strong fundamental absorption. As synthesized structures hold promise for potential applications in UV receivers, UV-C sources, gas sensors, as well as photocatalytic decomposition of water and organic pollutants.

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Lee, Sanghyuck, Chul Soon Park i Hyeonseok Yoon. "Nanoparticulate Photoluminescent Probes for Bioimaging: Small Molecules and Polymers". International Journal of Molecular Sciences 23, nr 9 (29.04.2022): 4949. http://dx.doi.org/10.3390/ijms23094949.

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Recent interest in research on photoluminescent molecules due to their unique properties has played an important role in advancing the bioimaging field. In particular, small molecules and organic dots as probes have great potential for the achievement of bioimaging because of their desirable properties. In this review, we provide an introduction of probes consisting of fluorescent small molecules and polymers that emit light across the ultraviolet and near-infrared wavelength ranges, along with a brief summary of the most recent techniques for bioimaging. Since photoluminescence probes emitting light in different ranges have different goals and targets, their respective strategies also differ. Diverse and novel strategies using photoluminescence probes against targets have gradually been introduced in the related literature. Among recent papers (published within the last 5 years) on the topic, we here concentrate on the photophysical properties and strategies for the design of molecular probes, with key examples of in vivo photoluminescence research for practical applications. More in-depth studies on these probes will provide key insights into how to control the molecular structure and size/shape of organic probes for expanded bioimaging research and applications.

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Belyakov, Mikhail, Elena Sokolova, Valentina Listratenkova, Nina Ruzanova i Leonid Kashko. "Photoluminescent Control Ripeness of the Seeds of Plants". E3S Web of Conferences 273 (2021): 01003. http://dx.doi.org/10.1051/e3sconf/202127301003.

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The development of technology for objectively determining the ripeness of plant seeds is an urgent task of modern agricultural production. An alternative to existing methods is optical photoluminescent technology, which is characterized by high accuracy, selectivity, expressiveness, as well as being remote and non-destructive. The spectral characteristics of excitation and photoluminescence of wheat, oat, and corn seeds during their maturation were measured using a spectrofluorometer using a previously developed technique. It was found that during maturation, the short-wave component of the excitation spectra decreases (λs=362 nm) and the long-wave component increases (λl=485 nm). After measuring the luminescence spectra, the integral photoluminescence fluxes for long-wave and short-wave excitation, as well as their ratio, were determined. We have obtained statistically reliable linear regression models of the dependence of long-wave and short-wave photoluminescence flows on the maturation time. Based on the obtained dependencies, a technology was developed for determining the degree of physiological maturation and making decisions about harvesting ripe seeds. It includes sample preparation, excitation and registration of luminescent radiation, amplification of the received signals and their relations, obtaining information about the degree of ripeness taking into account a priori dependencies.

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Kuznetsov, Alexey, Prithu Roy, Valeriy M. Kondratev, Vladimir V. Fedorov, Konstantin P. Kotlyar, Rodion R. Reznik, Alexander A. Vorobyev, Ivan S. Mukhin, George E. Cirlin i Alexey D. Bolshakov. "Anisotropic Radiation in Heterostructured “Emitter in a Cavity” Nanowire". Nanomaterials 12, nr 2 (13.01.2022): 241. http://dx.doi.org/10.3390/nano12020241.

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Tailorable synthesis of axially heterostructured epitaxial nanowires (NWs) with a proper choice of materials allows for the fabrication of novel photonic devices, such as a nanoemitter in the resonant cavity. An example of the structure is a GaP nanowire with ternary GaPAs insertions in the form of nano-sized discs studied in this work. With the use of the micro-photoluminescence technique and numerical calculations, we experimentally and theoretically study photoluminescence emission in individual heterostructured NWs. Due to the high refractive index and near-zero absorption through the emission band, the photoluminescence signal tends to couple into the nanowire cavity acting as a Fabry–Perot resonator, while weak radiation propagating perpendicular to the nanowire axis is registered in the vicinity of each nano-sized disc. Thus, within the heterostructured nanowire, both amplitude and spectrally anisotropic photoluminescent signals can be achieved. Numerical modeling of the nanowire with insertions emitting in infrared demonstrates a decay in the emission directivity and simultaneous rise of the emitters coupling with an increase in the wavelength. The emergence of modulated and non-modulated radiation is discussed, and possible nanophotonic applications are considered.

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Javadi, Morteza, Tapas Purkait, Lida Hadidi, John Washington i Jonathan G. C. Veinot. "Synthesis and properties of covalently linked photoluminescent magnetic magnetite nanoparticle-silicon nanocrystal hybrids". MRS Advances 1, nr 33 (2016): 2321–29. http://dx.doi.org/10.1557/adv.2016.465.

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ABSTRACTSilicon nanocrystals (SiNCs) are quantum dots that do not contain toxic metals and exhibit a photoluminescent response that may be tailored via changes in particle dimension as well as surface chemistry. Herein, we present a promising hybrid nanomaterial that combines the favourable properties (e.g., photoluminescence, biocompatibility, and surface chemistry) of SiNCs with the magnetic characteristics of Fe3O4nanoparticles (NPs). Linking these two complementary nanomaterials via DCC coupling has yielded a new advanced hybrid material that possesses the characteristics of its constituents and affords a photoluminescent system that responds to permanent magnets.

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Jin, Yu Juan, Teng Zhang, Mu Nan Qiu, Ting Ting Zhao, Kai Li Jiang i E. E. Wang. "Preparation of Photoluminescent ZnSe/PAMAM Nanocomposites". Advanced Materials Research 1044-1045 (październik 2014): 92–95. http://dx.doi.org/10.4028/www.scientific.net/amr.1044-1045.92.

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Uniform and well-dispersed photoluminescent semiconductor ZnSe (zinc selenium) QDs (Quantum dots) were in-situ prepared stabilized by G4.0-NH3+PAMAM(polyamidoamine) dendrimers in methanol. The properties of ZnSe QDs encapsulated in PAMAM dendrimers were characterized by UV-Vis absorption spectra and photoluminescence (PL) emission spectra. The results were: ZnSe/PAMAM NCs (nanocomposites) with molar ratio 15 emitted strongest fluorescence.

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Gao, Ming, Chi-Fai Cheung, Bo Wang i Chunjin Wang. "Synthesis of Green and Red-Emitting Polymethyl Methacrylate Composites Grafted from ZnAl2O4:Mn-Bonded GO via Surface-Initiated Atom Transfer Radical Polymerization". Polymers 14, nr 17 (5.09.2022): 3689. http://dx.doi.org/10.3390/polym14173689.

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A novel dual green and red-emitting photoluminescent polymer composite ZnAl2O4:Mn-bonded GO/polymethyl methacrylate (PMMA) was synthesized in a single-step reaction by surface-initiated atom transfer radical polymerization (SI-ATRP). The polymer chain was surface-initiated from the ZnAl2O4:Mn/GO, and the final products have a homogenous photoluminescent property from ZnAl2O4:Mn and better mechanical properties strengthened by graphene oxide (GO). The morphologies of ZnAl2O4:Mn/GO and the polymer composites were verified by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). X-ray diffraction analysis (XRD) revealed the two valence states of Mn (Mn2+, Mn4+) existing in the ZnAl2O4 host lattice, while Fourier-transform infrared spectroscopy (FTIR) spectra proved the transference of the active group, C-Br, from the initiator to the monomer during the polymerization. Gel permeation chromatography (GPC) shows the narrow dispersity of polymer composites fabricated through SI-ATRP. The SEM and FTIR results show the successful ‘graft’ of the polymer chains from the surface of ZnAl2O4:Mn/GO. The dual green and red-emitting polymer composites were synthesized, confirmed by the photoluminescence (PL) and photoluminescence excitation (PLE) results.

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42

Belyakov, Mikhail V., Gennady N. Samarin, Vyacheslav A. Ruzhev, Alexander A. Kudryavtsev, Igor Yu Efremenkov i Nikita D. Blinov. "Photoluminescence Spectral Patterns and Parameters of Milk While Souring". Agriculture 13, nr 5 (14.05.2023): 1054. http://dx.doi.org/10.3390/agriculture13051054.

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For the efficient production and processing of milk, it is important to control its quality indicators. Optical spectroscopy, in combination with statistical analysis methods, can be a useful method of evaluation due to its speed, non-invasiveness, and relative cheapness. This investigation is aimed at studying of the interrelations of the spectral patterns, the absorption parameters, and the photoluminescence values of cow’s milk during its souring. The spectral characteristics of excitation and photoluminescence were measured on a diffraction spectrofluorometer in the range of 200–500 nm. For establishing an effective control procedure during milk souring, the most informative method is found to be the use of the excitation wavelengths of 232 nm, 322 nm, 385 nm and 442 nm. These ranges correspond to the amino acids of milk proteins, the fatty acids of milk fat, and the aromatic fragments of vitamins. When using the photoluminescence flux ratios Φ232/Φ322 and Φ385/Φ442, linearly approximated dependences on acidity can be obtained with determination coefficients of 0.88–0.94. The proposed photoluminescent method can be used as a non-destructive and fast-acting tool for monitoring the properties of milk during fermentation, as well as for the subsequent creation of a portable and inexpensive sensor based on this method.

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Choi, Jin-Ho, Chae-Il Cheon i Jeong-Seog Kim. "Crystal Structure and Photoluminescence of Domestic Natural Alkaline Feldspar". Journal of the Korean Ceramic Society 44, nr 5 (31.05.2007): 155–59. http://dx.doi.org/10.4191/kcers.2007.44.5.155.

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Li, Fan, Chang Jun Liu, Feng Tian, Jian Yang i Zhi Hong Li. "Fabrication of Strong Photoluminescent Carbon Nanodots and its Preliminary Application in Cell Imaging". Advanced Materials Research 800 (wrzesień 2013): 312–16. http://dx.doi.org/10.4028/www.scientific.net/amr.800.312.

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Water-soluble fluorescent carbon nanodots (C-dots) with strong photoluminescence were synthesized on a large scale by a facile, one-step and mild pyrolytic route using ammonium citrate as carbon source. The as-prepared C-dots exhibited low cytotoxicity, excellent biocompatibility and preeminent multicolor photoluminescent properties. Furthermore, the cellular internalization of the obtained C-dots was evaluated and the results reconfirmed the C-dots potentials for bioimaging.

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Niu, Ya Ran, Xue Bin Zheng, Xuan Yong Liu, Heng Ji i Chuan Xian Ding. "Light-Emitting Characterization of Vacuum Plasma Sprayed Silicon Coatings". Key Engineering Materials 602-603 (marzec 2014): 989–92. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.989.

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In the present work, the light-emitting property of silicon coating was explored and the related morphologies and chemical structure of silicon coating were characterized. Silicon coating was prepared by vacuum plasma spray technique and chemically treated by HNO3/HF vapor. The coatings before and after the vapor etching were characterized by field emission scanning electron microscopy and micro-raman spectroscopy. The photoluminescence spectra of the silicon coatings treated with different time were examined. It is found that pores of micrometer and microcracks formed on the surface of silicon coatings after the treatment. The treated silicon coatings exhibited room temperature visible photoluminescence with emission wavelength around 650 nm after excitation. The results of micro-raman measurement proved that there were polysilane and oxygen related functional groups appeared on the coating surface after the vapor treatment, which was supposed to be responsible for the photoluminescent phenomena.

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Zhang, Yan, Guohui Yuan i Youyuan Huang. "Highly Yellow-Emitting Photoluminescent Carbon Dots Derived from Dendrimer Toward Fluorescent Nanocomposites and White LEDs". Nano 14, nr 07 (lipiec 2019): 1950091. http://dx.doi.org/10.1142/s1793292019500917.

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Photoluminescent carbon dots (CDs) are synthesized and derived from carboxyl-modified PAMAM dendrimer precursor by a one-pot solvothermal method. The obtained CDs exhibit highly bright Yellow-emitting fluorescence with quantum yield of 62.6%. In practice, using their excellent photoluminescence and good compatibility, the CDs are processed with polymers for various fluorescent nanocomposites (such as film, microfiber and bulk hydrogel) and applied as light conversion materials for white LEDs.

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Galdámez-Martinez, Andres, Guillermo Santana, Frank Güell, Paulina R. Martínez-Alanis i Ateet Dutt. "Photoluminescence of ZnO Nanowires: A Review". Nanomaterials 10, nr 5 (29.04.2020): 857. http://dx.doi.org/10.3390/nano10050857.

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One-dimensional ZnO nanostructures (nanowires/nanorods) are attractive materials for applications such as gas sensors, biosensors, solar cells, and photocatalysts. This is due to the relatively easy production process of these kinds of nanostructures with excellent charge carrier transport properties and high crystalline quality. In this work, we review the photoluminescence (PL) properties of single and collective ZnO nanowires and nanorods. As different growth techniques were obtained for the presented samples, a brief review of two popular growth methods, vapor-liquid-solid (VLS) and hydrothermal, is shown. Then, a discussion of the emission process and characteristics of the near-band edge excitonic emission (NBE) and deep-level emission (DLE) bands is presented. Their respective contribution to the total emission of the nanostructure is discussed using the spatial information distribution obtained by scanning transmission electron microscopy−cathodoluminescence (STEM-CL) measurements. Also, the influence of surface effects on the photoluminescence of ZnO nanowires, as well as the temperature dependence, is briefly discussed for both ultraviolet and visible emissions. Finally, we present a discussion of the size reduction effects of the two main photoluminescent bands of ZnO. For a wide emission (near ultra-violet and visible), which has sometimes been attributed to different origins, we present a summary of the different native point defects or trap centers in ZnO as a cause for the different deep-level emission bands.

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Ando, Shizutoshi, Saburo Endo, Hisayuki Nakanishi i Taizo Irie. "Study on the Crystallographic and Photoluminescent Properties of Cd3InGaS6. II. Photoluminescence". Japanese Journal of Applied Physics 31, Part 1, No. 9A (15.09.1992): 2803–10. http://dx.doi.org/10.1143/jjap.31.2803.

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Yoo, S. D., D. E. Aspnes, S. J. Rhee i J. C. Woo. "Reciprocal‐space analysis of photoluminescence and photoluminescence excitation spectra". Applied Physics Letters 68, nr 23 (3.06.1996): 3230–32. http://dx.doi.org/10.1063/1.116446.

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Horner, G. S., A. Mascarenhas, R. G. Alonso, S. Froyen, K. A. Bertness i J. M. Olson. "Photoluminescence and excitation-photoluminescence study of spontaneous ordering inGaInP2". Physical Review B 49, nr 3 (15.01.1994): 1727–31. http://dx.doi.org/10.1103/physrevb.49.1727.

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