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Articoli di riviste sul tema "Electroluminescent composites"

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Autore: Grafiati

Pubblicato: 7 luglio 2024

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1

Feres, Flavio H., Lucas Fugikawa Santos e Giovani Gozzi. "Temperature and Electric Field Influence on the Electrical Properties of Light-Emitting Devices Comprising PEDOT:PSS/GPTMS/Zn2SIO4:Mn Composites". MRS Advances 3, n. 33 (2018): 1883–89. http://dx.doi.org/10.1557/adv.2018.179.

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ABSTRACTIn the present study, we analyze the influence of temperature and active layer thickness on the electrical properties of electroluminescent devices comprising a polymeric conductive blend (poly(3,4 ethylenedioxythiophene):polystyrene sulfonate, PEDOT:PSS), an inorganic electroluminescent material (manganese doped zinc orthosilicate, Zn2SiO4:Mn) and an organosilicon material (3-glicidoxypropyltrimethoxysilane, GPTMS), manufactured at different weight ratios of the component materials. The devices were obtained by depositing the active layer by drop-casting onto ITO-coated (RF-sputtering) glass substrates and thermally evaporating gold top electrodes in high vacuum. The results show that 90 wt% Zn2SiO4:Mn is required to observe high electroluminescence from the fabricated devices and that the optimum performance (turn-on voltage of 33 V, luminous efficacy of 24 cd/A and maximum luminance of almost 2000 cd/m2) was achieve for a (9.5/0.5/90) (GPTMS/PEDOT:PSS/Zn2SiO4:Mn) weight ratio. The device turn-on voltage found to be as proportional to the thickness of the active layer, indicating that the electroluminescence occurs by a field-effect mechanism. The temperature variation in the 100-300 K range allowed us to develop a theoretical model for the device operation, where the charge carrier transport in the active layer is well described by the variable range hopping model, with luminous efficacy nearby independent of the temperature.

2

Janczak, Daniel, Marcin Zych, Tomasz Raczyński, Łucja Dybowska-Sarapuk, Andrzej Pepłowski, Jakub Krzemiński, Aleksandra Sosna-Głębska, Katarzyna Znajdek, Maciej Sibiński e Małgorzata Jakubowska. "Stretchable and Washable Electroluminescent Display Screen-Printed on Textile". Nanomaterials 9, n. 9 (7 settembre 2019): 1276. http://dx.doi.org/10.3390/nano9091276.

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Stretchable polymer composites are a new group of materials with a wide range of application possibilities in wearable electronics. The purpose of this study was to fabricate stretchable electroluminescent (EL) structures using developed polymer compositions, based on multiple different nanomaterials: luminophore nanopowders, dielectric, carbon nanotubes, and conductive platelets. The multi-layered EL structures have been printed directly on textiles using screen printing technology. During research, the appropriate rheological properties of the developed composite pastes, and their suitability for printed electronics, have been confirmed. The structure that has been created from the developed materials has been tested in terms of its mechanical strength and resistance to washing or ironing.

3

Jia, Yanmin, Xiangling Tian, Zheng Wu, Xiaojuan Tian, Jiayi Zhou, Yunzhang Fang e Chenchen Zhu. "Novel Mechano-Luminescent Sensors Based on Piezoelectric/Electroluminescent Composites". Sensors 11, n. 4 (1 aprile 2011): 3962–69. http://dx.doi.org/10.3390/s110403962.

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4

Kaplan, Saveliy F., Nelli F. Kartenko, Dmitry A. Kurdyukov, Alexander V. Medvedev e Valery G. Golubev. "Electroluminescent three-dimensional photonic crystals based on opal–phosphor composites". Applied Physics Letters 86, n. 7 (2005): 071108. http://dx.doi.org/10.1063/1.1866223.

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5

Lee, Jun-Young, e Jin-Ha Hwang. "Fabrication and Optical Properties of Inorganic Electroluminescent Devices". Journal of the Korean Ceramic Society 46, n. 3 (31 maggio 2009): 317–22. http://dx.doi.org/10.4191/kcers.2009.46.3.317.

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6

Wang, Feifei, Yanmin Jia, Jun Wu, Xiangyong Zhao e Haosu Luo. "Piezoelectric/electroluminescent composites for low voltage input flat-panel display devices". Applied Physics A 90, n. 4 (29 novembre 2007): 729–31. http://dx.doi.org/10.1007/s00339-007-4343-8.

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7

Stauffer, Flurin, e Klas Tybrandt. "Bright Stretchable Alternating Current Electroluminescent Displays Based on High Permittivity Composites". Advanced Materials 28, n. 33 (14 giugno 2016): 7200–7203. http://dx.doi.org/10.1002/adma.201602083.

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8

Korusenko, Petr M., Olga V. Petrova e Alexander S. Vinogradov. "Atomic and Electronic Structure of Metal–Salen Complexes [M(Salen)], Their Polymers and Composites Based on Them with Carbon Nanostructures: Review of X-ray Spectroscopy Studies". Applied Sciences 14, n. 3 (30 gennaio 2024): 1178. http://dx.doi.org/10.3390/app14031178.

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Currently, electrically conductive polymers based on transition metal complexes [M(Salen)], as well as their composites, are among the systems showing promise as catalysts, electrochromic and electroluminescent materials, and electrodes for energy storage (for batteries and supercapacitors). The current review focuses on elucidating the atomic and electronic structure of metal–salen complexes, their polymers, and composites with nanostructured carbon (carbon nanotubes and graphene) using modern X-ray spectroscopy methods (X-ray photoelectron (XPS) and valence-band photoemission (VB PES) spectroscopy, as well as near-edge (NEXAFS) and extended (EXAFS) X-ray absorption fine structure spectroscopy). We trust that this review will be of valuable assistance to researchers working in the field of synthesizing and characterizing metal–salen complexes and composites based on them.

9

Wu, Zheng, Xiangling Tian, Yanmin Jia, Xiaojuan Tian, A’xi Xie, Yihe Zhang e Haosu Luo. "Giant magneto-light output in three-phase magnetostrictive, piezoelectric, and electroluminescent composites". Applied Physics Letters 99, n. 21 (21 novembre 2011): 212503. http://dx.doi.org/10.1063/1.3663868.

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10

Vannikov, A. V., A. D. Grishina, M. G. Tedoradze, V. A. Kolesnikov e M. A. Brusentseva. "Photochemical formation of the electroluminescent image in polymer–silica gel nanoparticle composites". Journal of Photochemistry and Photobiology A: Chemistry 142, n. 1 (agosto 2001): 67–72. http://dx.doi.org/10.1016/s1010-6030(01)00473-7.

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11

Cho, Seung-Bum, Jung Inn Sohn, Sang-Seok Lee, Seung-Gyun Moon, Bo Hou e Il-Kyu Park. "Colour-encoded electroluminescent white light-emitting diodes enabled using perovskite–Cu–In–S quantum composites". Journal of Materials Chemistry C 9, n. 22 (2021): 7027–34. http://dx.doi.org/10.1039/d1tc00683e.

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Colloidal quantum dot white light-emitting diode has received much attention for ambient lighting, photonics and display. Efficient white colour toning is demonstrated by hybridising Perovskite and Chalcopyrite as a single electroluminescence layer.

12

Straue, Nadja, Martin Rauscher, Martina Dressler e Andreas Roosen. "Tape Casting of ITO Green Tapes for Flexible Electroluminescent Lamps". Journal of the American Ceramic Society 95, n. 2 (19 settembre 2011): 684–89. http://dx.doi.org/10.1111/j.1551-2916.2011.04836.x.

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13

Avanesyan, V. T., A. V. Rakina, M. M. Sychov e E. S. Vasina. "Optical and electrical properties of composites based on functional components of an electroluminescent layer". Optics and Spectroscopy 121, n. 1 (luglio 2016): 52–55. http://dx.doi.org/10.1134/s0030400x16070055.

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14

Kocherga, Margaret, Jose Castaneda, Michael G. Walter, Yong Zhang, Nemah-Allah Saleh, Le Wang, Daniel S. Jones et al. "Si(bzimpy)2 – a hexacoordinate silicon pincer complex for electron transport and electroluminescence". Chemical Communications 54, n. 100 (2018): 14073–76. http://dx.doi.org/10.1039/c8cc07681b.

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15

Li, Kuofei, Yunhui Zhu, Bing Yao, Yuannan Chen, Hao Deng, Qisheng Zhang, Hongmei Zhan, Zhiyuan Xie e Yanxiang Cheng. "Rotation-restricted thermally activated delayed fluorescence compounds for efficient solution-processed OLEDs with EQEs of up to 24.3% and small roll-off". Chemical Communications 56, n. 44 (2020): 5957–60. http://dx.doi.org/10.1039/d0cc01738h.

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16

Zvaigzne, Mariya, Irina Domanina, Dmitriy Il’gach, Alexander Yakimansky, Igor Nabiev e Pavel Samokhvalov. "Quantum Dot–Polyfluorene Composites for White-Light-Emitting Quantum Dot-Based LEDs". Nanomaterials 10, n. 12 (11 dicembre 2020): 2487. http://dx.doi.org/10.3390/nano10122487.

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Colloidal quantum dots (QDs) are a promising luminescent material for the development of next generation hybrid light-emitting diodes (QDLEDs). In particular, QDs are of great interest in terms of the development of solid-state light sources with an emission spectrum that mimics daylight. In this study, we used CdSe(core)/ZnS/CdS/ZnS(shell) QDs with organic ligands mimicking polyfluorene and its modified derivatives to obtain QD–polymer composites emitting white light. We found that the emission of the composites obtained by spin-coating, being strongly dependent on the chemical structure of the polymer matrix and the QD-to-polymer mass ratio, can be accurately controlled and adjusted to bring its emission spectrum close to the spectrum of daylight (CIE coordinates: 1931 0.307; 0.376). Moreover, the light emission of these composites has been found to be temporally stable, which is due to the minimal structural instability and volume-uniform charge and energy transfer properties. Thus, the use of the synthesized polyfluorene-based organic ligands with controllable chemical structures adaptable to the structure of the polymer matrix can significantly increase the stability of white light emission from QD composites, which can be considered promising electroluminescent materials for fabrication of white QDLEDs.

17

Kim, Mun Ja, Sung Min Park, Tae Young Lee, Sang Hyun Park, Jin Young Kim e Ji Beom Yoo. "Characterization of Brightness of Electroluminescent Device Using Powder Phosphor Composite with ZnO or TiO₂". Advances in Science and Technology 55 (settembre 2008): 150–53. http://dx.doi.org/10.4028/www.scientific.net/ast.55.150.

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For the growth of Electroluminescent (EL) device market, the attention of many researchers is centered on improving the properties such as brightness, power consumption, device reliability, etc. The powder EL device is one of solutions for the easy mass production, the simplification of structure, and low cost. Although the powder process is the solution, that has the problem with the poor brightness than the film process. So, we focused on increasing the brightness of powder EL device. The emissive layer was made up the composites adding metal oxide nanopowder such as TiO2 and ZnO to powder phosphors. As the data of previous researcher, the TiO2 and ZnO had the different dominating traps by photovoltage measure, that is, TiO2 show hole traps, ZnO show electron traps [1]. The brightness of powder EL device proportions to the high electricfield formation. The TiO2 or ZnO in the powder phosphor composite can help the emission that may be advantageous to form high electricfield at low voltage. The EL devices with green ZnS phosphor were fabricated using spin coating method. The effect of TiO2 and ZnO on the luminescent property of EL device was investigated. The brightness was obtained as applied driving voltage at 400 Hz and frequency variation at 50 V.

18

YANG, Z., B. HU e F. E. KARASZ*. "Contributions of Nonconjugated Spacers to Properties of Electroluminescent Block Copolymers". Journal of Macromolecular Science, Part A 35, n. 2 (febbraio 1998): 233–47. http://dx.doi.org/10.1080/10601329808001975.

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19

Petrykin, Valery, e Masato Kakihana. "Synthesis of BaAl2S4:Eu2+Electroluminescent Material by the Polymerizable Complex Method Combined with CS2Sulfurization". Journal of the American Ceramic Society 92 (gennaio 2009): S27—S31. http://dx.doi.org/10.1111/j.1551-2916.2008.02740.x.

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20

Cumming, W., R. A. Gaudiana, K. Hutchinson, E. Kolb, R. Ingwall, P. Mehta, R. A. Minns, C. P. Petersen e D. Waldman. "Control of Chromophore Length in Electroluminescent Polymers. Part II. Mainchain Polymers". Journal of Macromolecular Science, Part A 33, n. 9 (settembre 1996): 1301–16. http://dx.doi.org/10.1080/10601329608010923.

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21

Al-Janabi, Omer Yasin, Peter J. S. Foot, Emaad Taha Al-Tikrity e Peter Spearman. "Synthesis and Characterisation of Novel Thiophene Based Azomethine Polymers and Study of Their Liquid Crystalline, Electrochemical and Optoelectronic Properties". Polymers and Polymer Composites 25, n. 5 (giugno 2017): 345–62. http://dx.doi.org/10.1177/096739111702500504.

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This work reports the synthesis, structural characterisation, liquid crystallinity, luminescence and electroluminescence of novel thiophene azomethine polymers. The polymers under study were prepared via oxidative polymerisation of four novel monomers at room temperature using iron (III) chloride. The chemical structures of the prepared monomers and polymers were confirmed by infrared and 1H and 13CNMR spectroscopy. Molecular masses were determined for monomers and polymers by gas/liquid chromatography-mass spectrometry (GC/LC-MS) and by gel-permeation (size exclusion) chromatography (SEC), respectively. Thermal stability studies of the prepared materials were achieved by thermogravimetric analysis (TGA), and the onset of weight loss To and the endset Tmax were calculated from the thermograms. Liquid crystalline mesophases and phase changes of the monomers and polymers were studied by differential scanning calorimetry (DSC) and polarised optical microscopy (POM), and the glass transition temperatures Tg of the polymers were determined from the DSC curves. The electrochemical band gaps, HOMO and LUMO energy levels were measured by cyclic voltammetry. UV-visible absorption-emission spectra (liquid and solid films) of the polymers were obtained at room temperature with different solvents. Optical band gaps were calculated from the absorption edges, and were in good agreement with those estimated from cyclic voltammetry. Mixing the polymers with lanthanide salts such as EuCl3 and YbCl3 gave modified fluorescence, and the light emitted was much more intense than that from the pure polymers. Polymer based light-emitting diodes (PLEDs) were fabricated by spin coating, and their current-voltage characteristics were measured. In preliminary work, the polymer devices were found to produce electroluminescent spectra similar to the PL spectra of the corresponding samples. Molecular modelling studies were performed both on polymer segments and monomer molecules; the absorption spectra of the prepared polymers, HOMO and LUMO energy levels were calculated with ZINDO using AMI geometry optimisation.

22

Kalinowski, Jan. "Bimolecular excited species in optical emission from organic electroluminescent devices". Journal of Non-Crystalline Solids 354, n. 35-39 (ottobre 2008): 4170–75. http://dx.doi.org/10.1016/j.jnoncrysol.2008.06.089.

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23

Morgado, Jorge, Ana Charas, José A. Fernandes, Isabel S. Gonçalves, Luis D. Carlos e Luis Alcácer. "Luminescence properties of composites made of a europium(III) complex and electroluminescent polymers with different energy gaps". Journal of Physics D: Applied Physics 39, n. 16 (4 agosto 2006): 3582–87. http://dx.doi.org/10.1088/0022-3727/39/16/009.

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24

Cheng, Chih-Chia, Chen-Han Chien, Ying-Chieh Yen, Yun-Sheng Ye, Fu-Hsiang Ko, Chun-Hung Lin e Feng-Chih Chang. "A new organic/inorganic electroluminescent material with a silsesquioxane core". Acta Materialia 57, n. 6 (aprile 2009): 1938–46. http://dx.doi.org/10.1016/j.actamat.2008.12.031.

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25

Kumar, V., D. K. Sharma, M. K. Bansal, D. K. Dwivedi e T. P. Sharma. "Synthesis and characterization of screen-printed CdS films". Science of Sintering 43, n. 3 (2011): 335–41. http://dx.doi.org/10.2298/sos1103335k.

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Abstract (sommario):

Cadmium sulphide films having energy band gap of 2.4 eV found applications in solar cells and electroluminescent devices. CdS polycrystalline films have been prepared on ultra-clean glass substrate by screen-printing technique and then sintered in air. Optimum conditions for preparing good quality screen-printed films have been found. The optical band gaps ?Eg? of the CdS films were determined from the UV transmission spectroscopy and were found to be 2.47eV. The Wurtzite structure of CdS films was confirmed by X-ray diffraction analysis. DC conductivity and activation energy of films was also measured in vacuum by two-probe technique.

26

Shimizu, H., M. Yoshimi, K. Hattori, H. Okamoto e Y. Hamakawa. "Improvement of blue-light emission in amorphous carbon based electroluminescent device". Journal of Non-Crystalline Solids 137-138 (gennaio 1991): 1275–78. http://dx.doi.org/10.1016/s0022-3093(05)80356-4.

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27

Adachi, D., H. Haze, H. Shirahase, T. Toyama e H. Okamoto. "Blue emitting thin-film electroluminescent devices utilizing Tm-doped ZnS nanocrystals". Journal of Non-Crystalline Solids 352, n. 9-20 (giugno 2006): 1628–31. http://dx.doi.org/10.1016/j.jnoncrysol.2006.01.076.

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28

Xia, Yangjun, Junfeng Tong, Xia Ren, Jie Luo, Nong Wang, Hongbing Wu e Duowang Fan. "Synthesis and characterization of green to orange electroluminescent copolymers derived from fluorene and 2,3-dimethylnaphthalopyrazine". Polymer Science Series B 52, n. 9-10 (ottobre 2010): 614–20. http://dx.doi.org/10.1134/s1560090410090149.

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29

Nosova, G. I., D. A. Lypenko, R. Yu Smyslov, I. A. Berezin, E. V. Zhukova, E. I. Mal’tsev, A. V. Dmitriev et al. "Synthesis and photo- and electroluminescent properties of copolyfluorenes with nile red fragments in side chains". Polymer Science Series B 56, n. 1 (gennaio 2014): 59–76. http://dx.doi.org/10.1134/s1560090414010072.

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30

Wu, Li Shuang, Xiao Yi Huang e Hui Shan Yang. "The Influence of the Performance to the Blue Organic Electroluminescent Device with Excton Confining Layer TPBi". Applied Mechanics and Materials 536-537 (aprile 2014): 1464–68. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1464.

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The blue organic electroluminescent device using TPBi as hole blocking layer is reported. The structure of device is ITO/ NPB(30 nm)/ DPVBi (15 nm)/ TPBi (x nm,x=0, 6)/ Alq (30 nm)/ LiF(1 nm)/ Al (200 nm) . With the addition of the TPBi not only make the highly of the blue organic electroluminescent device stable attachment x=0.168,y=0.170, but also the color coordinates change is very small and the chromaticity is relatively stable, which is coming from TPBi blocked hole in the organic emitting layer so as to improve the balance of the carrier, the composite probability of the exciton in organic functional layer and the efficiency of the organic electroluminescence device. The experiment shows the efficiency of the device is 3.32 cd/A, the maximum brightness of the device can reach 2222 cd/m2when the voltage is 20V, respectively.

31

Tanaka, Hiromitsu, Shizou Tokito, Yasunori Taga e Akane Okada. "Novel hole-transporting materials based on triphenylamine for organic electroluminescent devices". Chemical Communications, n. 18 (1996): 2175. http://dx.doi.org/10.1039/cc9960002175.

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Guo, Zeng-Shan, Lihua Zhao, Jian Pei, Zhang-Lin Zhou, Gary Gibson, James Brug, Sity Lam e Samuel S. Mao. "CdSe/ZnS Nanoparticle Composites with Amine-Functionalized Polyfluorene Derivatives for Polymeric Light-Emitting Diodes: Synthesis, Photophysical Properties, and the Electroluminescent Performance". Macromolecules 43, n. 4 (23 febbraio 2010): 1860–66. http://dx.doi.org/10.1021/ma902573d.

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33

Singh, Paramjeet, B. Rajesh, Swati Bishnoi, G. Swati, V. V. Jaiswal, V. Shanker e D. Haranath. "Optimization of processing parameters for designing an efficient AC driven powder electroluminescent device". Ceramics International 42, n. 15 (novembre 2016): 17016–22. http://dx.doi.org/10.1016/j.ceramint.2016.07.209.

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34

Zhang, Hongyu, Cheng Huo, Jingying Zhang, Peng Zhang, Wenjing Tian e Yue Wang. "Efficient single-layer electroluminescent device based on a bipolar emitting boron-containing material". Chem. Commun., n. 3 (2006): 281–83. http://dx.doi.org/10.1039/b513918j.

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Gather, Malte C., Martin Heeney, Weimin Zhang, Katherine S. Whitehead, Donal D. C. Bradley, Iain McCulloch e Alasdair J. Campbell. "An alignable fluorene thienothiophene copolymer with deep-blue electroluminescent emission at 410 nm". Chemical Communications, n. 9 (2008): 1079. http://dx.doi.org/10.1039/b716510b.

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Armelao, Lidia, Daniele Camozzo, Silvia Gross e Eugenio Tondello. "Embedding of electroluminescent ZnS:Cu phosphors in PMMA matrix by polymerization of particle suspension in MMA monomer". Journal of Non-Crystalline Solids 345-346 (ottobre 2004): 402–6. http://dx.doi.org/10.1016/j.jnoncrysol.2004.08.052.

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Sellinger, Alan, Ryo TamakiPresent address: General Elec, Richard M. Laine, Kazunori Ueno, Hiroshi Tanabe, Evan Williams e Ghassan E. Jabbour. "Heck coupling of haloaromatics with octavinylsilsesquioxane: solution processable nanocomposites for application in electroluminescent devices". Chemical Communications, n. 29 (2005): 3700. http://dx.doi.org/10.1039/b505048k.

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38

Thangthong, A.-monrat, Duangratchaneekorn Meunmart, Narid Prachumrak, Siriporn Jungsuttiwong, Tinnagon Keawin, Taweesak Sudyoadsuk e Vinich Promarak. "Bifunctional anthracene derivatives as non-doped blue emitters and hole-transporters for electroluminescent devices". Chemical Communications 47, n. 25 (2011): 7122. http://dx.doi.org/10.1039/c1cc11624j.

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Chen, Chien-Tien, Jin-Sheng Lin, Murthy V. R. K. Moturu, Yi-Wen Lin, Wei Yi, Yu-Tai Tao e Chin-Hsiung Chien. "Doubly ortho-linked quinoxaline/triarylamine hybrid as a bifunctional, dipolar electroluminescent template for optoelectronic applications". Chemical Communications, n. 31 (2005): 3980. http://dx.doi.org/10.1039/b506409k.

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40

Xu, Xianbin, Xiaolong Yang, Jingshuang Dang, Guijiang Zhou, Yong Wu, Hua Li e Wai-Yeung Wong. "Trifunctional IrIII ppy-type asymmetric phosphorescent emitters with ambipolar features for highly efficient electroluminescent devices". Chemical Communications 50, n. 19 (2014): 2473. http://dx.doi.org/10.1039/c3cc47875k.

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41

Shi, Xiang, Xufeng Zhou, Ye Zhang, Xiaojie Xu, Zhitao Zhang, Peng Liu, Yong Zuo e Huisheng Peng. "A self-healing and stretchable light-emitting device". Journal of Materials Chemistry C 6, n. 47 (2018): 12774–80. http://dx.doi.org/10.1039/c8tc02828a.

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42

Guan, Min, Zu Qiang Bian, Yi Feng Zhou, Fu You Li, Zhong Jun Li e Chun Hui Huang. "High-performance blue electroluminescent devices based on 2-(4-biphenylyl)-5-(4-carbazole-9-yl)phenyl-1,3,4-oxadiazole". Chemical Communications, n. 21 (2003): 2708. http://dx.doi.org/10.1039/b307571k.

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43

Aizawa, Koji, e Yusuke Ohtani. "Ferroelectric and Luminescent Properties of Electroluminescence Devices Using Ferroelectric Polymer-Phosphor Composite Films". Key Engineering Materials 388 (settembre 2008): 137–40. http://dx.doi.org/10.4028/www.scientific.net/kem.388.137.

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Abstract (sommario):

We fabricated and characterized electroluminescence (EL) devices using ferroelectric polyvinylidene fluoride/trifluoroethylene (PVDF/TrFE) copolymer composites mixed with Mn- and Cu-activated ZnS phosphor particles. Spin-coated polymer composite films on glass substrates with transparent conductive oxides were dried at 140 oC for 1 h in vacuum due to growth of ferroelectric phase. The maximum remnant polarization and luminescence of the fabricated devices were approximately 20 μC/cm2 and 100 cd/m2, respectively. Increases of the luminescence were observed in the fabricated EL devices using PVDF/TrFE copolymer in comparison with using PVDF polymer as dielectrics. EL emission intensities were also enhanced by applying the bipolar pulses. These results suggest an effect of polarization reversal in the composite films.

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Wang, Junling, Zhiqun He, Yongsheng Wang, Linping Mu e Anmin Cao. "Photoluminescence and Electroluminescence from a Hybrid of Lumogen Red in Nanoporous-Silica". Journal of Nanoscience and Nanotechnology 8, n. 3 (1 marzo 2008): 1336–40. http://dx.doi.org/10.1166/jnn.2008.18192.

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In this paper white electroluminescence from a lumogen red-doped nanoporous silica matrix is presented. The matrix was prepared using a sol–gel process, and lumogen red—a perylene derivative—was doped at a number of concentrations. The photoluminescence and electroluminescence of the lumogen red-doped nanoporous-silica composite were investigated in detail. The structures, surface morphology, and optical properties of the nanoporous silica composites were investigated. The average pore size of the nanoporous-silica matrix was ∼5 nm. The absorption spectra of the lumogen red in the nanoporous-silica matrix were broader than those from solution specimens. The photoluminescence of the lumogen red-doped nanoporous-silica matrix depended strongly on the excitation wavelengths. When excited at relatively longer wavelengths, e.g., 467 nm, the emissions peaked at constant positions (∼608 nm) for all cases, except a small shift to the red from its solution 601 nm. However, if excited at a shorter wavelength in the range of 200–400 nm, additional blue emissions were observed, which were particularly strong and suggested defect centers of the nanoporous-silica matrix. The electroluminescence from a single-layered sandwich device consisting of the lumogen red-doped nanoporous-silica was interesting. When driving with an AC electric field, electroluminescence spectra covered a whole spectral range, consisting of the red emission from lumogen red and the blue and green emission from the nanoporous silica matrix. In this way, we actually achieved a white electroluminescence from this hybrid organic and silica device with a color coordinate, CIE [x, y] = [0.30, 0.35] at a driving electric field of 3.0 × 106 V/cm. This was a first attempt to investigate electroluminescence from an organic dye-doped nanoporous silica matrix.

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Pan’kov, A. A., e P. V. Pisarev. "Numerical Modeling of Electroelastic Fields in the Surface Piezoelectric Luminescent Optical Fiber Sensor to Diagnose Deformation of Composite Plates". PNRPU Mechanics Bulletin, n. 2 (15 dicembre 2020): 64–77. http://dx.doi.org/10.15593/perm.mech/2020.2.06.

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We developed a three-dimensional numerical model of a piezoelectric luminescent optical fiber sensor fixed on a composite’s plate. The computational region of the sensor is the optical fiber with two concentric (with 6 sectors) shells of electroluminescent and piezoelectric materials, two control electrodes on interface surfaces, such as optical fiber-electroluminophore and piezoelectric-cover. The external sensor’s cover is made in the form of a semi-elliptic cylindrical polymer shell, which rectangular base is fixed on the surface of the fiberglass plate. In the piezoelectric shell sectors, the polarization directions of the PVDF transversal-isotropic polymer piezoelectric are different and non-planar for any three sectors. Deformation of the plate causes deformation of the sensor fixed on its surface, as well as the occurrence of informative piezoelectric fields in it, thus the occurrence of informative glows of electroluminescent elements. As a result, we find the requested information about the combined deformed state of the composite plate along the length of the sensor based on the digital processing of the integral intensities of the polychrome light signals at the output of the optical fiber. In simple cases of electric and mechanical loads, we present new numerical results of simulating the distribution of non-uniform electroelastic fields in the sensor multiphase volume, the sensor’s external cover and inside fragment of the composite plate. Loading of the sensor-covering-plate system is performed by controlling electric voltage on the sensor’s electrodes and the plate’s mechanical deformation by stretching along the transverse and longitudinal axes, as well as by twisting around these axes and bending in transverse and longitudinal planes. Numerical values of the control and informative transfer coefficients of the piezoelectric luminescent optical fiber sensor are determined, which makes it possible to perform a reliable and high-precision diagnostics of complex deformations of the composite plates and design sensors of this type.

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Funchien, Patteera, Pongsakorn Chasing, Taweesak Sudyoadsuk e Vinich Promarak. "A highly efficient near infrared organic solid fluorophore based on naphthothiadiazole derivatives with aggregation-induced emission enhancement for a non-doped electroluminescent device". Chemical Communications 56, n. 46 (2020): 6305–8. http://dx.doi.org/10.1039/d0cc01648a.

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Mal’tsev, Eugene I., Dmitry A. Lypenko, Boris I. Shapiro, Maria A. Brusentseva, George H. W. Milburn, Jeffrey Wright, Andre Hendriksen, Vladimir I. Berendyaev, Boris V. Kotov e Anatoly V. Vannikov. "Electroluminescence of polymer/J-aggregate composites". Applied Physics Letters 75, n. 13 (27 settembre 1999): 1896–98. http://dx.doi.org/10.1063/1.124864.

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48

Lee, Kyu Won, S. P. Lee, H. Choi, Kyu Hyun Mo, Jae Won Jang, H. Kweon e Cheol Eui Lee. "Enhanced electroluminescence in polymer-nanotube composites". Applied Physics Letters 91, n. 2 (9 luglio 2007): 023110. http://dx.doi.org/10.1063/1.2756290.

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49

Xiong, Sha, Shihua Huang, Aiwei Tang e Feng Teng. "Electroluminescence from Light-Emitting Diodes by Using Water-Dispersed ZnSe Nanocrystals and Polymer". Journal of Nanoscience and Nanotechnology 8, n. 3 (1 marzo 2008): 1341–45. http://dx.doi.org/10.1166/jnn.2008.18193.

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Electroluminescence was obtained from an indium-tin-oxide/poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV): ZnSe/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP)/8-tris-hydroxyquinoline (Alq3)/LiF/Al structured device, in which ZnSe nanocrystals were synthesized in aqueous solution by using mercapto-acetate acid as stabilizer. The mechanical, electrical, and optical properties of the device were established. The photoluminescence and electroluminescence spectra changed with the mass ratio of ZnSe to MEH-PPV in the composite. Comparison between the absorption spectra and photoluminescence spectra of the ZnSe nanocrystals and the MEH-PPV thin film exhibited an effective energy transfer from ZnSe nanocrystals to MEH-PPV, which was one reason for the difference between the photoluminescence and electroluminescence spectra of the MEH-PPV: ZnSe composite film. The recombination mechanism of ZnSe nanocrystals under photo excitation and electric injection was investigated with the help of a single layer device structure of indium-tin-oxide/ZnSe/LiF/Al.

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Li, Haitao, Yihe Zhang, Han Dai, Wangshu Tong, Yan Zhou, Junfeng Zhao e Qi An. "A self-powered porous ZnS/PVDF-HFP mechanoluminescent composite film that converts human movement into eye-readable light". Nanoscale 10, n. 12 (2018): 5489–95. http://dx.doi.org/10.1039/c8nr00379c.

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