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Littérature scientifique sur le sujet « Organic emitters »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Organic emitters"

Dini, Danilo. « Electrochemiluminescence from Organic Emitters ». Chemistry of Materials 17, n^o 8 (avril 2005) : 1933–45. http://dx.doi.org/10.1021/cm049567v.

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Service, R. F. « Organic Light Emitters Gain Longevity ». Science 273, n^o 5277 (16 août 1996) : 878–80. http://dx.doi.org/10.1126/science.273.5277.878.

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Shizu, Katsuyuki, Jiyoung Lee, Hiroyuki Tanaka, Hiroko Nomura, Takuma Yasuda, Hironori Kaji et Chihaya Adachi. « Highly efficient electroluminescence from purely organic donor–acceptor systems ». Pure and Applied Chemistry 87, n^o 7 (1 juillet 2015) : 627–38. http://dx.doi.org/10.1515/pac-2015-0301.

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AbstractThermally activated delayed fluorescence (TADF) emitters are third-generation electroluminescent materials that realize highly efficient organic light-emitting diodes (OLEDs) without using rare metals. Here, after briefly reviewing the principles of TADF and its use in OLEDs, we report a sky-blue TADF emitter, 9-(4-(benzo[d]thiazol-2-yl)phenyl)-N3,N3,N6,N6-tetraphenyl-9H-carbazole-3,6-diamine (DAC-BTZ). DAC-BTZ is a purely organic donor–acceptor-type molecule with a small energy difference between its lowest excited singlet state and lowest triplet state of 0.18–0.22 eV according to fluorescence and phosphorescence spectra of a DAC-BTZ-doped film. In addition, the doped film exhibits a high photoluminescence quantum yield of 0.82. Time-resolved photoluminescence measurements of the doped film confirm that DAC-BTZ emits TADF. An OLED containing DAC-BTZ as an emitter exhibits a maximum external quantum efficiency (EQE) of 10.3%, which exceeds those obtained with conventional fluorescent emitters (5–7.5%). TADF from DAC-BTZ makes a large contribution to the high EQE of its OLED.

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Tourneur, P., F. Lucas, C. Quinton, Y. Olivier, R. Lazzaroni, P. Viville, J. Cornil et C. Poriel. « White-light electroluminescence from a layer incorporating a single fully-organic spiro compound with phosphine oxide substituents ». Journal of Materials Chemistry C 8, n^o 41 (2020) : 14462–68. http://dx.doi.org/10.1039/d0tc03285a.

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Gerhardt, Ilja, Bernhard Grotz, Petr Siyushev et Jörg Wrachtrup. « Coherent interaction of single molecules and plasmonic nanowires ». International Journal of Modern Physics B 31, n^o 24 (30 septembre 2017) : 1740004. http://dx.doi.org/10.1142/s0217979217400045.

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Quantum plasmonics opens the option to integrate complex quantum optical circuitry onto chip scale devices. In the past, often external light sources were used and nonclassical light was coupled in and out of plasmonic structures, such as hole arrays or waveguide structures. Another option to launch single plasmonic excitations is the coupling of single emitters in the direct proximity of, e.g., a silver or gold nanostructure. Here, we present our attempts to integrate the research of single emitters with wet-chemically grown silver nanowires. The emitters of choice are single organic dye molecules under cryogenic conditions, which are known to act as high-brightness and extremely narrow-band single photon sources. Another advantage is their high optical nonlinearity, such that they might mediate photon–photon interactions on the nanoscale. We report on the coupling of a single molecule fluorescence emission through the wire over the length of several wavelengths. The transmission of coherently emitted photons is proven by an extinction type experiment. As for influencing the spectral properties of a single emitter, we are able to show a remote change of the line-width of a single terrylene molecule, which is in close proximity to the nanowire.

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Han, Si Hyun, et Jun Yeob Lee. « Spatial separation of sensitizer and fluorescent emitter for high quantum efficiency in hyperfluorescent organic light-emitting diodes ». Journal of Materials Chemistry C 6, n^o 6 (2018) : 1504–8. http://dx.doi.org/10.1039/c7tc05283a.

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A quantum efficiency improving device approach to harvest singlet excitons of fluorescent emitters was developed by sequential deposition of sensitizer-doped emitting layer and fluorescent emitter doped emitting layer.

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Hao, Fengzhen, Jiusheng Li, Zhen Wang et Yanfeng Li. « Effect of Chlorination and Acidification on Clogging and Biofilm Formation in Drip Emitters Applying Secondary Sewage Effluent ». Transactions of the ASABE 61, n^o 4 (2018) : 1351–63. http://dx.doi.org/10.13031/trans.12764.

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Abstract. The risk and inducing mechanism of emitter clogging vary with the types of ions in the irrigation water. The effectiveness of chlorination and acidification treatments in reducing emitter clogging has seldom been comparatively studied. The objective of this study was to quantify the influence of chlorination and acidification in reducing clogging in emitters applying secondary sewage effluent with different types of ions. Two types of emitters with plain channels and one type of emitter with a labyrinth structure were selected to investigate the clogging control strategy by measuring the dry weight of biofilm substance (DW) and the organic matter fraction in the biofilm and analyzing the mineral constituents of the clogging solids and the extracellular polymeric substance (EPS) of the attached biofilm. In general, chemical injection decreased the DW and EPS, resulting in less clogging than in emitters without chlorine and acid injection. For the emitter structures tested, chemical injection was more effective in controlling clogging in plain channel emitters than in labyrinth emitters. Different chemical injections produced similar mineral constituents of the clogging solids: quartz, calcium + magnesium carbonate, silicate, and iron oxide. Chlorine injection interval and targeted acidification pH are both important parameters in determining chemical injection schemes. Under the experimental conditions, weekly chlorination of sewage effluent acidified to pH 6.5 was more effective in reducing the growth and reproduction of microorganisms and the precipitation of solid particles in the drip emitters when applying sewage effluent containing high iron + calcium. However, when sewage effluent containing high calcium was used, acidification was more effective in removing the chemical precipitates. We conclude that the selection of chemical treatment strategies should consider the constituent ions in the sewage effluent. Keywords: Acid injection, Chlorine injection, Extracellular polymeric substance (EPS), Mineral constituents, Microirrigation.

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Meng, Xin-Yue, Zi-Qi Feng, You-Jun Yu, Liang-Sheng Liao et Zuo-Quan Jiang. « Highly Efficient Blue Thermally Activated Delayed Fluorescence Emitters Based on Multi-Donor Modified Oxygen-Bridged Boron Acceptor ». Molecules 27, n^o 13 (23 juin 2022) : 4048. http://dx.doi.org/10.3390/molecules27134048.

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The employment of thermally activated delayed fluorescence (TADF) emitters is one of the most promising ways to realize the external quantum efficiency (EQE) of over 25% for organic light-emitting diodes (OLEDs). In addition, the TADF emitter based on oxygen-bridged boron (BO) fragment can maintain blue emission with high color purity. Herein, we constructed two blue TADF emitters, 3TBO and 5TBO, for OLEDs application. Both emitters consist of three donors linked at the oxygen-bridged boron acceptor. OLED devices based on 3TBO and 5TBO exhibited both high excellent device efficiency and high color purity with a maximum EQE; full-width at half-maximum (FWHM); and CIE coordinates of 17.3%, 47 nm, (0.120, 0.294), and 26.2%, 57 nm, (0.125, 0.275), respectively.

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Jung, Hyuck, Duck-Jin Lee, Hyun-Tae Chun, Nam-Je Koh, Young Rae Cho et Dong-Gu Lee. « Carbon Nanotube Field Emitters for Display Applications Using Screen Printing ». Materials Science Forum 475-479 (janvier 2005) : 1889–92. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.1889.

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In this study, a 10"-sized panel with novel tetrode structure was tried to prevent broadening of electrons emitted from CNTs. The structure of the novel tetrode is composed of CNT emitters on a cathode electrode, a gate electrode, an extracting electrode coated on the top of a hopping electron spacer (HES), and an anode. HES contains funnel-shaped holes whose inner surfaces are coated with MgO. Electrons extracted through the gate are collected inside the funnel-shaped holes and hop along the hole surface to the top extracting electrode. The effects of HES on emission characteristics of field emission display (FED) were investigated. An active ozone treatment for the complete removal of residues of organic binders in the emitter devices was applied to the FED panel as a post-treatment

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Cekaviciute, Monika, Aina Petrauskaite, Sohrab Nasiri, Jurate Simokaitiene, Dmytro Volyniuk, Galyna Sych, Ruta Budreckiene et Juozas Vidas Grazulevicius. « Towards Blue AIE/AIEE : Synthesis and Applications in OLEDs of Tetra-/Triphenylethenyl Substituted 9,9-Dimethylacridine Derivatives ». Molecules 25, n^o 3 (21 janvier 2020) : 445. http://dx.doi.org/10.3390/molecules25030445.

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Aiming to design blue fluorescent emitters with high photoluminescence quantum yields in solid-state, nitrogen-containing heteroaromatic 9,9-dimethylacridine was refined by tetraphenylethene and triphenylethene. Six tetra-/triphenylethene-substituted 9,9-dimethylacridines were synthesized by the Buchwald-Hartwig method with relatively high yields. Showing effects of substitution patterns, all emitters demonstrated high fluorescence quantum yields of 26–53% in non-doped films and 52–88% in doped films due to the aggregation induced/enhanced emission (AIE/AIEE) phenomena. In solid-state, the emitters emitted blue (451–481 nm) without doping and deep-blue (438–445 nm) with doping while greenish-yellow emission was detected for two compounds with additionally attached cyano-groups. The ionization potentials of the derivatives were found to be in the relatively wide range of 5.43–5.81 eV since cyano-groups were used in their design. Possible applications of the emitters were demonstrated in non-doped and doped organic light-emitting diodes with up to 2.3 % external quantum efficiencies for simple fluorescent devices. In the best case, deep-blue electroluminescence with chromaticity coordinates of (0.16, 0.10) was close to blue color standard (0.14, 0.08) of the National Television System Committee.

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Thèses sur le sujet "Organic emitters"

Langner, Maik. « Laterally modified microcavity systems containing organic emitters ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-67568.

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The scope of this work is an in-depth investigation of dielectric mirror microcavities with central organic dye layers, which are preferably modified in at least one lateral dimension. The large quality factor of the planar resonator in conjunction with comparatively stable and spectrally broad emitting molecules allows for a detailed analysis of several aspects of microresonator systems. Their optical properties are analyzed both with transmission and luminescence measurements as well as in the lasing regime. The first part presents the resonant mode properties of planar and laterally structured microcavities. With the help of a high-resolution imaging micro-photoluminescence setup, working either in the spatial (near field) or vectorial (far field) regime, the polarization splitting is studied in a detuned microcavity, containing the dye 4,4'-bis[(N-carbazole)styryl]biphenyl (BSB-Cz) in a matrix of 4,4'-di(N-carbazolyl)- biphenyl (CBP). With the help of a thickness gradient, a relation between the large spectral distance of the cross-polarized states and the mode position within the stop band is investigated. In shadow-mask prepared, laterally restricted devices (5x5 µm2 square boxes), the three-dimensional confinement introduces sets of discrete modes, which experience a similar polarization splitting. The origin in this case is a different phase shift of electromagnetic waves during internal total reflection at a boundary. By using a concentration gradient planar microcavity sample of the dye 4-(dicyanomethylene)-2-methyl-6-(4-(dimethylamino)styryl)-4H-pyran (DCM) in a tris-(8-hydroxyquinoline)aluminum (Alq3) matrix, the influence of the number of emitters on the lasing characteristics is subsequently analyzed. Depending on the pumping conditions, and thus the involvement of the Förster resonant energy transfer, an optimal composition is identified. After a qualitative evaluation of the long-term stability upon various excitation energies, the attention is focussed to the modification of the stimulated emission properties of photonic boxes. The stronger field concentration and altered density of states leads to a significant improvement of the values for the coupling factor fi and the threshold levels. Furthermore, new properties arise, namely simultaneous multimode and off-axis laser emission. With an inhomogeneous excitation of the box, it is possible to selectively excite single modes above the threshold. The work ends with experimental results of metal structures as additional optical element in the organic microcavity layer. Here, the aim is is to understand the passive influence of these possible contact- devices on the lasing performance. For this purpose, the lasing is studied at an interface of an areal thin metal layer, which is incorporated in the organic layer.

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Jiang, Jinyue. « Design, Synthesis, and Properties of New Derivatives of Pentacene and New Blue Emitters ». Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1145645147.

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Bachawala, Praveen. « Design, Synthesis and Properties of Corannulene Based Blue Emitters and Carcerands ». University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1368014057.

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Garrote, Cañas Ana Maria. « Design, synthesis and photophysical characterisation of N-containing organic emitters and their metal complexes ». Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/17251/.

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This study aimed to design novel N-containing heterocyclic compounds, utilising different synthetic strategies to tune the photophysical properties of these compounds. This research was focussed on three families of compounds: indoles, hydrazones and phenanthrolines. Hydrazones were proved to be useful precursors for the preparation of the bis(indoyl) derivatives via a double Fischer indole synthesis. Structural modifications and their effect on the photophysical properties were studied. Also, the pH response and metal sensing ability of these compounds were investigated. Despite the popularity of research involving indoles, a vast majority focusses on the development of new materials via functionalisation of the C-2 position. This thesis described two different strategies to modulate the photophysical properties of materials through a) structural modification of the organic framework aimed at altering its electron distribution and b) a use of metals aimed at the formation of organometallic complexes. Finally, the synthesis of five novel phenanthroline ligands was explored using two different strategies. Photophysical properties of the novel phenanthroline derivatives were investigated. Also, the synthesis of Ir(III) phenanthroline complexes was carried out and their photophysical properties were evaluated.

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Liu, Yuh-Shiuan. « Ultraviolet emitters grown by metalorganic chemical vapor deposition ». Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50415.

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This thesis presents the development of III-nitride materials for deep-ultraviolet (DUV) light emitting devices. The goal of this research is to develop a DUV laser diode (LD) operating at room temperature. Epitaxial structures for these devices are grown by metalorganic chemical vapor deposition (MOCVD) and several material analysis techniques were employed to characterize these structures such as atomic force microscopy, electroluminescence, Hall-effect measurement, photoluminescence, secondary ion mass spectrometry, transmission electron microscopy, transmission line measurement, and X-ray diffraction. Each of these will be discussed in detail. The active regions of III-nitride based UV emitters are composed of AlxGa1-xN alloys, the bandgap of which can be tuned from 3.4 eV to 6.2 eV, which allows us to attain the desired wavelength in the DUV by engineering the molar fraction of aluminum and gallium. In order to emit photons in the DUV wavelength range (> 4.1 eV), high aluminum molar fraction AlxGa1-xN alloys are required. Since aluminum has very low ad-atom mobility on the growth surface, a very low group V to group III precursor ratio (known as V/III ratio), high growth temperature, and low growth pressure is required to form a smooth surface and subsequently abrupt heterointerfaces. The first part of this work focuses on developing high-quality multi-quantum well structures using high aluminum molar fraction ([Al] > 60%) AlxGa1-xN alloys. Optically pumped DUV lasers were demonstrated with threshold power density as low as 250 kW/cm² for the emission wavelength as short as 248.3 nm. Transverse electric (TE) -like emission dominates when the lasers were operating above threshold power density, which suggests the diode design requires the active region to be fully strained to promote better confinement of the optical mode in transverse direction. The second phase of this project is to achieve an electrically driven injection diode laser. Owing to their large bandgap, low intrinsic carrier concentration, and relatively high dopant activation energy, the nature of these high aluminum molar fraction materials are highly insulating; therefore, efficiently transport carriers into active region is one of the main challenges. Highly conducting p-type material is especially difficult to achieve because the activation energy for magnesium, a typical dopant, is relatively large and some of the acceptors are compensated by the hydrogen during the growth. Furthermore, due to the lack of a large work function material to form a p-type ohmic contact, the p-contact layer design is limited to low aluminum molar fraction material or gallium nitride. Besides the fabrication challenges, these low aluminum molar fraction materials are not transparent to the laser wavelength causing relatively high internal loss (αi). In this work, an inverse tapered p-waveguide design is employed to transport holes to active region efficiently while the graded-index separate-confinement heterostructure (GRINSCH) is employed for the active region design. Together, a multi-quantum well (MQW) ultraviolet emitter was demonstrated.

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Langner, Maik [Verfasser], Karl [Akademischer Betreuer] Leo et Uli [Akademischer Betreuer] Lemmer. « Laterally modified microcavity systems containing organic emitters / Maik Langner. Gutachter : Karl Leo ; Uli Lemmer. Betreuer : Karl Leo ». Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://d-nb.info/1067188452/34.

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Wada, Yoshimasa. « Molecular Design and Realization of Highly Efficient Thermally Activated Delayed Fluorescence Emitters for Organic Light-Emitting Diodes ». Doctoral thesis, Kyoto University, 2020. http://hdl.handle.net/2433/253298.

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京都大学
0048
新制・課程博士
博士(工学)
甲第22462号
工博第4723号
新制||工||1738(附属図書館)
京都大学大学院工学研究科分子工学専攻
(主査)教授梶弘典, 教授佐藤啓文, 教授関修平
学位規則第4条第1項該当
Doctor of Philosophy (Engineering)
Kyoto University
DFAM

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Mac, Ciarnaín Rossá [Verfasser], Torsten Gutachter] Fritz, Francesco [Gutachter] Michelotti et Andreas [Gutachter] [Tünnermann. « Emission properties of small molecule phosphor emitters in organic light emitting diodes / Rossá Mac Ciarnaín ; Gutachter : Torsten Fritz, Francesco Michelotti, Andreas Tünnermann ». Jena : Friedrich-Schiller-Universität Jena, 2017. http://d-nb.info/117760017X/34.

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Abdelhameed, Reda Mohamed. « Post-synthetic modification of metal–organic frameworks ». Doctoral thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/15516.

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Doutoramento em Química
Post-synthetic modification (PSM) of metal-organic frameworks encompassing the chemical transformation of the linker present is a promising new route for engineering optical centres and tuning the light emission properties of materials, both in the visible and in the near infrared (NIR) spectral regions. Here, PSM of isoreticular metal-organic framework-3 (IRMOF-3) with ethyl oxalyl monochloride, ethyl acetoacetate, pentane-2,4-dione, 3-(2- hydroxyphenyl)-3-oxopropanal, 2-chloroacetic acid, glyoxylic acid, methyl vinyl ketone and diethyl (ethoxymethylene)malonate followed by chelation of trivalent lanthanide ions afforded intriguing near infrared (Nd3+) and visible (Eu3+, Tb3+) light emitters. IRMOF-3 was used as a case in point due to both its highly porous crystalline structure and the presence of non-coordinating amino groups on the benzenedicarboxylate (bdc) linker amenable to modification. The materials were characterised by elemental analysis, powder X-ray diffraction, optical, scanning and transmission electron microscopy, Fourier transform infrared spectroscopy, and liquid and solid-state nuclear magnetic resonance. The solid-state luminescence properties of Ln-modified-IRMOF-3 were investigated at room temperature. The presence of the bdc aromatic ring, β– diketonate and oxalate enhanced the Ln3+ sensitization via ligand-to-metal energy transfer (anthena effect). As far as photocalysis is concerned, we have synthesized metal−organic frameworks (Cr-MIL-125-AC, Ag-MIL-125-AC) by a green method (solid–vapors reactions). The resulting functionalized materials show a photocatalytic activity for methylene blue degradation up to 6.52 times larger than that of the commercial photocatalyst hombikat UV-100. These findings open the door for further research for improving the photocatalytic performance of metal-organic frameworks.
A modificação pós-síntese de estruturas metalo-orgânicas compreendendo na transformação do ligando orgânico presente é uma nova e promissora via para a engenharia de centros ópticos, permitido sintonizar as propriedades de emissão de luz de materiais na região do visível e do infravermelho próximo. Nesta dissertação, procedeu-se à modificação pós-sintética da estrutura isorreticular metal-orgânica-3 (IRMOF-3) com 2-cloro-2-oxoacetato de etilo, acetoacetato de etilo, pentano-2,4-diona, 3-(2-hidroxifenil)-3-oxopropanal, ácido 2-cloroacético, ácido glioxílico, metilvinil cetona e (etoximetileno)malonato de dietilo, seguida da quelação com iões lantanídeos trivalentes, a qual originou interessantes emissores de luz na região do infravermelho próximo (Nd3+) e do visível (Eu3+, Tb3+). O IRMOF-3 foi usado como um caso de estudo devido quer à sua a estrutura cristalina que apresenta considerável microporosidade, quer à presença de grupos amino livres no ligando benzenodicarboxilato (bdc), que são passíveis de modificação. Os materiais foram caracterizados por análise elementar, difracção de raios X de pós, microscopias óptica, electrónica de varrimento e de transmissão, espetroscopias de infravermelho com transformadas de Fourier e de ressonância magnética nuclear (estados líquido e sólido). As propriedades de luminescência dos materiais Ln-IRMOF-3-modificados foram estudadas à temperatura ambiente. A presença do anel aromático bdc, β- dicetonato e oxalato reforça a sensibilização do Ln3+ através da transferência de energia do ligando para o metal (efeito antena). No que respeita à fotocatálise, sintetizaram-se novos materiais metal-orgânicos (Cr-MIL-125-AC, Ag-MIL-125-AC) através de uma reação sólido-vapor. Estes materiais apresentam uma excelente atividade fotocatalítica para a degradação de azul de metileno até 6,52 vezes maior que o fotocatalisador comercial hombikat UV- 100. Estes resultados abrem a porta a novos estudos que visam melhorar a actividade fotocatalítica de materiais metalo-orgânicos.

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Jakoby, Marius Felix [Verfasser], et B. S. [Akademischer Betreuer] Richards. « Investigating Exciton Dynamics by Photoluminescence Quenching Experiments in Metal-Organic Frameworks and Thermally Activated Delayed Fluorescence Emitters / Marius Felix Jakoby ; Betreuer : B. S. Richards ». Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1231361514/34.

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Livres sur le sujet "Organic emitters"

Forrest, Stephen R. Organic Electronics. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198529729.001.0001.

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Organic electronics is a platform for very low cost and high performance optoelectronic and electronic devices that cover large areas, are lightweight, and can be both flexible and conformable to irregularly shaped surfaces such as foldable smart phones. Organics are at the core of the global organic light emitting device (OLED) display industry, and also having use in efficient lighting sources, solar cells, and thin film transistors useful in medical and a range of other sensing, memory and logic applications. This book introduces the theoretical foundations and practical realization of devices in organic electronics. It is a product of both one and two semester courses that have been taught over a period of more than two decades. The target audiences are students at all levels of graduate studies, highly motivated senior undergraduates, and practicing engineers and scientists. The book is divided into two sections. Part I, Foundations, lays down the fundamental principles of the field of organic electronics. It is assumed that the reader has an elementary knowledge of quantum mechanics, and electricity and magnetism. Background knowledge of organic chemistry is not required. Part II, Applications, focuses on organic electronic devices. It begins with a discussion of organic thin film deposition and patterning, followed by chapters on organic light emitters, detectors, and thin film transistors. The last chapter describes several devices and phenomena that are not covered in the previous chapters, since they lie outside of the current mainstream of the field, but are nevertheless important.

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Vairappan, Charles S. Ecological Chemicals as Ecosystem Function Mediaters and Potential Lead Pharmaceuticals. UMS Press, 2021. http://dx.doi.org/10.51200/ecologicalchemicalsumspress2021-978-967-2962-94-6.

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Relationship between functioning ecosystem services and human wellbeing has been established as a bridge connecting nature and society. It has also become central pillar of sustainability science and dictates the paradigms of sustainable development. But, conceptual frameworks that systematically integrates the important roles played by natural ecological chemicals by establishing empirical links between the nature and ecology not only varies, but lacks clear support. The value of ecological chemicals as ecosystem derived natural products warrants explicit acknowledgement, only then trade-offs between services and prioritization of policy can be realised. In the last 20 years, important roles played by the ecological chemicals in Bornean terrestrial and marine ecosystems were investigated and reported. Terrestrial plants produce Volatile Organic Chemicals (VOCs) and structurally interesting secondary metabolites that facilitate their ecological processes that are aimed to establish communication such as defence, attraction, deterrent and territorial marking. Some of the most commonly utilized herbs and plants of traditional medicine importance showed very interesting chemical constituents, that justify their traditional utilization for human wellbeing. The role of VOCs that originated from animal diet and emitted through decomposition of faeces, was traced back to their important role as attractants of insects, particularly dung beetles that facilitates the remineralization of faeces and returns C and N to soil as to replenish global C and N-sink. Marine flora and fauna are perhaps the most vivid producers of structurally interesting secondary metabolites with more than one ecological functions. Halogenated secondary metabolites produced by red algae Laurencia are unique in their structural design and exhibited multiple biological potentials. Similarly, soft corals in the Sulu-Sulawesi Coral Triangle produced a huge diversity of terpenoids and functions as feeding deterrents of these soft bodied invertebrates. Ecological chemicals obtained from the Bornean biodiversity also exhibited a wide array of medically important biological activities such as anti-microbial, anti-inflammation, anti-anticancer and serves an important array of lead pharmaceuticals. Some of these compounds are very potent and have been patented as lead-pharmaceutical candidates from Bornean natural products. Hence, ecological chemicals are important natural products that regulate ecological processes that ensures ecological balance in tropical ecosystems. Humans who are the custodians of natural ecosystem, stand to benefit directly and indirectly when we practice sustainable utilization and regulation of our natural resources.

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Chapitres de livres sur le sujet "Organic emitters"

Hall, Michael John, et Santiago de la Moya. « BODIPY Based Emitters of Circularly Polarized Luminescence ». Dans Circularly Polarized Luminescence of Isolated Small Organic Molecules, 117–49. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2309-0_6.

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Yersin, Hartmut, Andreas F. Rausch et Rafał Czerwieniec. « Organometallic Emitters for OLEDs : Triplet Harvesting, Singlet Harvesting, Case Structures, and Trends ». Dans Physics of Organic Semiconductors, 371–424. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527654949.ch13.

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Pieters, Gregory, et Lucas Frederic. « Design of Circularly Polarized Thermally Activated Delayed Fluorescence Emitters ». Dans Circularly Polarized Luminescence of Isolated Small Organic Molecules, 293–308. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2309-0_13.

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Sharma, Nidhi, Michael Yin Wong, Ifor D. W. Samuel et Eli Zysman-Colman. « Solution-Processed TADF Materials and Devices Based on Organic Emitters ». Dans Highly Efficient OLEDs, 501–41. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527691722.ch14.

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Barbieri, Andrea, Elisa Bandini, Filippo Monti, Vakayil K. Praveen et Nicola Armaroli. « The Rise of Near-Infrared Emitters : Organic Dyes, Porphyrinoids, and Transition Metal Complexes ». Dans Topics in Current Chemistry Collections, 269–307. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-59304-3_9.

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González-Sánchez, Emilio J., Manuel Moreno-Garcia, Amir Kassam, Saidi Mkomwa, Julio Roman-Vazquez, Oscar Veroz-Gonzalez, Rafaela Ordoñez-Fernandez et al. « Climate smart agriculture for Africa : the potential role of conservation agriculture in climate smart agriculture. » Dans Conservation agriculture in Africa : climate smart agricultural development, 66–84. Wallingford : CABI, 2022. http://dx.doi.org/10.1079/9781789245745.0003.

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Abstract To achieve the challenges raised in Agenda 2063 and the Malabo Declaration, new agricultural techniques need to be promoted. Practical approaches to implement climate smart agriculture and sustainable agriculture, able to deliver at field level, are required. These include sustainable soil and land management that allows different user groups to manage their resources, including water, crops, livestock and associated biodiversity, in ways that are best suited to the prevailing biophysical, socio-economic and climatic conditions. The adoption of locally adapted sustainable soil management practices is needed to support climate change mitigation and adaptation from the agricultural perspective. In this sense, Conservation Agriculture (CA) can be adapted to local conditions, and help achieve the key objectives. The application of CA principles brings multiple benefits, especially in terms of soil conservation, but also for mitigating climate change. In fact, CA has the ability to transform agricultural soils from being carbon emitters into carbon sinks, because of no-tillage (NT) techniques and the return to the soil of diverse crop biomass from above-ground parts of plants and from diverse roots systems and root exudates. Similarly, fossil energy use decreases due to the reduction in agricultural operations, and so less CO₂ is emitted to the atmosphere. Lower greenhouse gas (GHG) emissions in CA also result, because of reduced and more efficient use of inputs. Scientific studies confirm the sequestration potential of increased soil organic carbon (SOC) stocks on croplands in Africa on each of the continent's major bioclimatic areas. Coefficients of SOC sequestration for Africa are presented in this chapter.

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Schols, Sarah. « Triplet-Emitter Doped Organic Materials ». Dans Device Architecture and Materials for Organic Light-Emitting Devices, 97–115. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1608-7_6.

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Ratiu, I. Andreea, Tomasz Ligor, Fernanda Monedeiro, Maciej Milanowski, Joanna Rudnicka et Bogusław Buszewski. « Volatile Organic Compounds Emitted by Biological Matrices ». Dans Handbook of Bioanalytics, 277–93. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95660-8_13.

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Ratiu, I. Andreea, Tomasz Ligor, Fernanda Monedeiro, Maciej Milanowski, Joanna Rudnicka et Bogusław Buszewski. « Volatile Organic Compounds Emitted by Biological Matrices ». Dans Handbook of Bioanalytics, 1–17. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-63957-0_13-1.

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Kumar, Amit, Akshaya Kumar Palai, Kanchan Saxena, Vinod K. Jain, Ritu Srivastava, Modeeparampil N. Kamalasanan et Ishwar Singh. « Mixed Ligand Orange Emitter Zinc Complex for Organic Light Emitting Diodes ». Dans Physics of Semiconductor Devices, 891–93. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03002-9_229.

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Actes de conférences sur le sujet "Organic emitters"

Jordan, R. H., A. Dodabalapur, M. Strukelj, L. J. Rothberg, R. E. Slusher et T. M. Miller. « High Efficiency White and Colored Organic Electroluminescence ». Dans Organic Thin Films for Photonic Applications. Washington, D.C. : Optica Publishing Group, 1995. http://dx.doi.org/10.1364/otfa.1995.thc.1.

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The need for light weight, low power multicolor displays and backlights has spurred interest in thin-film, organic electroluminescent (EL) devices. A typical organic EL device consists of an indium-tin oxide anode (ITO) layer on a glass substrate, and sequential layers of bis(triphenyl)diamine (TAD, hole transporter), tris(8-hydroxyquinoline)aluminum (A1Q, electron transporter and green light-emitter), and a low work function metal cathode (e.g., Al or Mg:Ag).1 Device efficiency, stability, and spectral output can be tailored by incorporating intermediate layers of organic hole-blockers2 or blue-emitters,3 or doping A1Q with narrow spectral linewidth organic dyes.4 Cavity resonance effects have been employed in lithographically patterned optical microcavities to select single5or multiple6 colors out of broad spectrum organic emitters like A1Q. Device efficiency is a critical parameter, especially for liquid crystal display backlight applications. We will describe an approach for white light EL and an approach for enhancing device efficiency.

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Shin, Hwangyu, Seokwoo Kang, Hyocheol Jung, Hayoon Lee, Jaehyun Lee, Beomjin Kim et Jongwook Park. « New ultra deep blue emitters based on chrysene chromophores ». Dans SPIE Organic Photonics + Electronics, sous la direction de Franky So, Chihaya Adachi et Jang-Joo Kim. SPIE, 2016. http://dx.doi.org/10.1117/12.2236813.

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Ma, Biwu. « Nanoscale Site Isolation of Different Emitters for White Emission ». Dans Solid-State and Organic Lighting. Washington, D.C. : OSA, 2013. http://dx.doi.org/10.1364/soled.2013.dm1e.2.

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Song, Wook, Sang Kyu Jeon et Jun Yeob Lee. « Various applications of blue thermally activated delayed fluorescent emitters ». Dans Solid-State and Organic Lighting. Washington, D.C. : OSA, 2015. http://dx.doi.org/10.1364/soled.2015.dm4d.1.

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Wallesch, Manuela, Daniel Volz, Charlotte Fléchon, Daniel M. Zink, Stefan Bräse et Thomas Baumann. « Bright coppertunities : efficient OLED devices with copper(I)iodide-NHetPHOS-emitters ». Dans SPIE Organic Photonics + Electronics, sous la direction de Franky So et Chihaya Adachi. SPIE, 2014. http://dx.doi.org/10.1117/12.2060499.

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Nakanotani, Hajime, et Chihaya Adachi. « High efficiency organic light-emitting diodes with conventional fluorescent emitters ». Dans Solid-State and Organic Lighting. Washington, D.C. : OSA, 2014. http://dx.doi.org/10.1364/soled.2014.dw5c.1.

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Tien, Kun-Cheng, Hao-Wu Lin, Chun-Liang Lin, Han-Chieh Chang, Ting-Yi Cho, Chih-Jen Yang, Chih-Hao Chang et Chung-Chih Wu. « Optical processes of organic emitters in optical microcavity ». Dans NanoScience + Engineering, sous la direction de Zeno Gaburro et Stefano Cabrini. SPIE, 2007. http://dx.doi.org/10.1117/12.735224.

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Koller, Daniel M., Andreas Hohenau, Harald Ditlbacher, Nicole Galler, Franz R. Aussenegg, Alfred Leitner, Joachim R. Krenn et Emil J. W. List. « Organic light-emitting diodes as surface plasmon emitters ». Dans 2009 11th International Conference on Transparent Optical Networks (ICTON). IEEE, 2009. http://dx.doi.org/10.1109/icton.2009.5185321.

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Brütting, Wolfgang. « What controls the orientation of TADF emitters ? » Dans Organic and Hybrid Light Emitting Materials and Devices XXV, sous la direction de Tae-Woo Lee, Franky So et Chihaya Adachi. SPIE, 2021. http://dx.doi.org/10.1117/12.2595332.

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xu, weidong. « Manipulating crystallization dynamics through chelating molecules for bright perovskite emitters ». Dans 13th Conference on Hybrid and Organic Photovoltaics. València : Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.hopv.2021.082.

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Rapports d'organisations sur le sujet "Organic emitters"

Biefeld, R. M., A. A. Allerman, S. R. Kurtz et K. C. Baucom. Progress in the growth of mid-infrared InAsSb emitters by metal-organic chemical vapor deposition. Office of Scientific and Technical Information (OSTI), août 1998. http://dx.doi.org/10.2172/661741.

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Biefeld, R. M., S. R. Kurtz et A. A. Allerman. Novel materials and device design by metal-organic chemical vapor deposition for use in infrared emitters. Office of Scientific and Technical Information (OSTI), décembre 1996. http://dx.doi.org/10.2172/414397.

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Snider, Thomas J. An Analysis of Air Pollution Control Technologies for Shipyard Emitted Volatile Organic Compounds (VOCS). Fort Belvoir, VA : Defense Technical Information Center, mars 1993. http://dx.doi.org/10.21236/ada458147.

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Whitecloud, Simone, Holly VerMeulen, Franz Lichtner, Nadia Podpora, Timothy Cooke, Christopher Williams, Michael Musty, Irene MacAllister et Jason Dorvee. Understanding plant volatiles for environmental awareness : chemical composition in response to natural light cycles and wounding. Engineer Research and Development Center (U.S.), novembre 2022. http://dx.doi.org/10.21079/11681/45961.

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Plants emit a bouquet of volatile organic compounds (VOCs) in response to both biotic and abiotic stresses and, simultaneously, eavesdrop on emit-ted signals to activate direct and indirect defenses. By gaining even a slight insight into the semantics of interplant communications, a unique aware-ness of the operational environment may be obtainable (e.g., knowledge of a disturbance within). In this effort, we used five species of plants, Arabidopsis thaliana, Panicum virgatum, Festuca rubra, Tradescantia zebrina, and Achillea millefolium, to produce and query VOCs emitted in response to mechanical wounding and light cycles. These plants provide a basis for further investigation in this communication system as they span model organisms, common house plants, and Arctic plants. The VOC com-position was complex; our parameter filtering often enabled us to reduce the noise to fewer than 50 compounds emitted over minutes to hours in a day. We were able to detect and measure the plant response through two analytical methods. This report documents the methods used, the data collected, and the analyses performed on the VOCs to determine if they can be used to increase environmental awareness of the battlespace.

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Hodgson, Alfred T., William J. Fisk, Derek G. Shendell et Michael G. Apte. Predicted concentrations in new relocatable classrooms of volatile organic compounds emitted from standard and alternate interior finish materials. Office of Scientific and Technical Information (OSTI), juillet 2001. http://dx.doi.org/10.2172/817239.

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Koziel, Jacek, Yael Laor, Jeffrey Zimmerman, Robert Armon, Steven Hoff et Uzi Ravid. Simultaneous Treatment of Odorants and Pathogens Emitted from Confined Animal Feeding Operations (CAFOs) by Advanced Oxidation Technologies. United States Department of Agriculture, janvier 2009. http://dx.doi.org/10.32747/2009.7592646.bard.

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A feasibility study was conducted, aiming to explore the potential effectiveness of UV/TiO2/O3 photooxidation technologies for simultaneous treatment of odorant and pathogen emissions from livestock and poultry operations. Several key parameters were tested in laboratory (US) and semi-pilot (Israel) scale conditions including: the effects of light energy dose (treatment time and light intensity), relative humidity and air temperature, UV wavelength, presence of photocatalyst (TiO2) and the presence of ozone. Removal and conversion of odor, target gases (sulfur-containing volatile organic compounds S-VOCs, volatile fatty acids (VFAs), phenolics, and ammonia), and airborne pathogens was tested. Up to 100% removal (below method detection level) of S-VOCs, VFAs, and phenolics, the overall odor, and up to 64.5% of ammonia was achieved with optimized treatment. Treatments involving deep UV band (185 nm) and photocatalyst (TiO2) were more efficient in removal/conversion of odorous gases and odor. The estimate of the operational cost of treatment was based on measured emissions of several odorous VOCs from full scale, commercial swine farm ranges from $0.15 to $0.59 per finisher pig. This figure represents significantly lower cost compared with the cost of biofiltration or air scrubbing.

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