Gotowe bibliografie tematyczne / White light producing materials

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Gotowa bibliografia na temat „White light producing materials”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "White light producing materials"

Kuang, Meng, Junhao Li, Jinjun Zhang, Jianhong Ding, Ziwang Zhang, Kangrong Huang, Nan Yang, Ziheng Zhang, Mingming Yang i Haiyong Ni. "A novel Dy³⁺-activated single-phase white light-emitting phosphor for solid-state lighting". New Journal of Chemistry 45, nr 45 (2021): 21066–73. http://dx.doi.org/10.1039/d1nj04570a.

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Taide, S. T., N. B. Ingle i S. K. Omanwar. "Standard approach for energy transfer scheme and tunable emission for white light-emitting diodes (W-LEDs)". International Journal of Modern Physics B 30, nr 25 (28.09.2016): 1650179. http://dx.doi.org/10.1142/s0217979216501794.

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Rare-earth (RE) activated (Dy[Formula: see text]/Sm[Formula: see text] and Ce[Formula: see text]/Tb[Formula: see text]) polycrystalline CaSO4 phosphors were prepared by co-precipitation method. Powder XRD pattern confirmed their structure and phase, while FE-SEM investigation reflected the particle morphology. The optical absorption and emission analysis were carried out to find efficient energy transfer within codoped phosphors, a possible energy transfer mechanism was discussed and energy transfer efficiencies were calculated. The multicolor emission from these materials suggests sustainable and well-defined approach towards possibility of obtaining tunable emission for producing while light emission, which finds potential applications in field emission display (FED) and white light-emitting diodes (W-LEDs).

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Ding, Jingwen, i Challa V. Kumar. "Non-Covalent Assembly of Multiple Fluorophores in Edible Protein/Lipid Hydrogels for Applications in Multi-Step Light Harvesting and White-Light Emission". Molecules 28, nr 16 (12.08.2023): 6028. http://dx.doi.org/10.3390/molecules28166028.

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The design and production of biodegradable and sustainable non-toxic materials for solar-energy harvesting and conversion is a significant challenge. Here, our goal was to report the preparation of novel protein/lipid hydrogels and demonstrate their utility in two orthogonal fundamental studies—light harvesting and white-light emission. Our hydrogels contained up to 90% water, while also being self-standing and injectable with a syringe. In one application, we loaded these hydrogels with suitable organic donor-acceptor dyes and demonstrated the energy-transfer cascade among four different dyes, with the most red-emitting dye as the energy destination. We hypothesized that the dyes were embedded in the protein/lipid phase away from the water pools as monomeric entities and that the excitation of any of the four dyes resulted in intense emission from the lowest-energy acceptor. In contrast to the energy-transfer cascade, we demonstrate the use of these gels to form a white-light-emitting hydrogel dye assembly, in which excitation migration is severely constrained. By restricting the dye-to-dye energy transfer, the blue, green, and red dyes emit at their respective wavelengths, thereby producing the composite white-light emission. The CIE color coordinates of the emission were 0.336 and 0.339—nearly pure white-light emission. Thus, two related studies with opposite requirements could be accommodated in the same hydrogel, which was made from edible ingredients by a simple method. These gels are biodegradable when released into the environment, sustainable, and may be of interest for energy applications.

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Gao, Pao, Jun Xin, Cheng Feng Yan, Hai Kuan Kong, Jian Jun Chen, Xue Chao Liu i Er Wei Shi. "Research on the Key Problems in the Industrialization of SiC Substrate Materials". Materials Science Forum 963 (lipiec 2019): 56–59. http://dx.doi.org/10.4028/www.scientific.net/msf.963.56.

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The development of semiconductor materials and devices will lead to a new industrial technology revolution, in which the Silicon Carbide (SiC) substrate material has very excellent performance and it is especially suitable for manufacturing wave length lasers, white light emitting tubes, high-frequency, high-temperature and high-power devices, etc. This paper focuses on solving the key problems for producing large size and low defects of SiC crystals by the PVT method, such as the preparation and purification of the high purity raw material, the simulation of the temperature field, the control of the crystal defects and the growth of the large size SiC crystals.It is critical for the development of SiC industry.

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Kadim, Akeel M. "Zinc Selenide Quantum Dots Light Emitting Devices (ZnSe QDs-LEDs) with Different Organic Polymers". Nano Hybrids and Composites 18 (listopad 2017): 11–19. http://dx.doi.org/10.4028/www.scientific.net/nhc.18.11.

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The physical and chemical characterize of quantum dots (QDs) extensively depend upon the optical and morphological factors such as size and shape. The zinc selenide (ZnSe) quantum dots (QDs) have been prepared by chemical method and used to fabricate quantum dot hybrid junction devices with different types of organics polymers. The optical studies illustrate that the band gap value from the photoluminescence (PL) with high intensity of these QDs is found about 3.1 eV. The electroluminescence's (EL) hybrid devices were demonstrated by room temperature PL and electroluminescence (EL). Current-voltage (I–V) characteristics indicate that the output current is good compared to the few voltages (5.5 V) used which gives good results to get a generation of white light. The EL spectrum reveals a broad emission band covering the range from 350 - 700 nm. The emissions producing this white luminescence were recognized depending on the chromaticity coordinates (CIE 1931). The correlated color temperature (CCT) was found to be about 5759, 3500 and 3498 K for ITO/TPD/ZnSe, ITO/PPV/ZnSe and ITO/PEDOT/ZnSe QDs respectively. Fabrication of EL- hybrid devices from semiconductors materials (ZnSe QDs) with holes injection organic polymer (TPD, PPV and PEDOT) was effective in white light generation.

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Wojtania, Agnieszka, Bożena Matysiak, Monika Mieszczakowska-Frąc, Jacek S. Nowak i Justyna Szwejda-Grzybowska. "Responses of Micropropagated Rhubarb (Rheum rhaponticum) Plantlets to Different Growing Media and Light Conditions in the Greenhouse". Agriculture 13, nr 4 (18.04.2023): 890. http://dx.doi.org/10.3390/agriculture13040890.

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Cultivating red-stalked rhubarb plants is an important source of raw materials for producing health-promoting foods. The quality and quantity of rhubarb crops are significantly dependent on planting material. To obtain high-quality planting material for the value selection of the rhubarb ‘Raspberry’, we evaluated the morphological and physiological responses of micropropagated plantlets to different growth substrates and light quality during early growth ex vitro in the greenhouse. The plantlets were grown in high-EC (GM1) and low-EC (GM2) peat substrates under four light-emitting diodes (LED) light treatments as supplementary lighting (SL) in the wintertime: 100% red (R), 100% blue (B), white light [44.4% green (G), 24.4% B, 28.9% R; 2.2% far red (FR)] and R+B+G+FR (49.4/16.3/10.3/23.8%) light. Compared to the control (natural sunlight), applied LED lighting significantly increased all growth parameters, but only in plantlets grown in GM1 substrate. Among LED treatments, R+B+G+FR light had the most stimulative effect on all growth parameters (length of leaf petioles, leaf area, biomass) and soluble sugar production. Still, it decreased the levels of phenolic compounds in the leaf petioles. Phenolic synthesis, mainly anthocyanins, was the highest under white light (622.8 mg·100 g−1 dry mass), followed by red (601.8 mg·100 g−1), blue (464.4 mg·100 g−1), and R+B+G+FR light (416.4 mg·100 g−1). High anthocyanin accumulation under R-LED light was associated with high antioxidant activity and growth cessation. Hence, for optimal effects related to plant growth and anthocyanin biosynthesis, the use of W-LED lighting is recommended for the early growth ex vitro of micropropagated rhubarb plantlets.

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Li, Qinfeng, Zheng He, Hussein E. Rozan, Chao Feng, Xiaojie Cheng i Xiguang Chen. "An improved blood hemorrhaging treatment using diatoms frustules, by alternating Ca and light levels in cultures". Marine Life Science & Technology 5, nr 3 (18.08.2023): 316–25. http://dx.doi.org/10.1007/s42995-023-00180-3.

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AbstractHemorrhage control requires hemostatic materials that are both effective and biocompatible. Among these, diatom biosilica (DBs) could significantly improve hemorrhage control, but it induces hemolysis (the hemolysis rate > 5%). Thus, the purpose of this study was to explore the influence of Ca2+ biomineralization on DBs for developing fast hemostatic materials with a low hemolysis rate. Here, CaCl2 was added to the diatom medium under high light (cool white, fluorescent lamps, 67.5 µmol m−2 s−1), producing Ca-DBs-3 with a particle size of 40–50 μm and a Ca2+ content of Ca-DBs-3 obtained from the higher concentration CaCl2 group (6.7 mmol L−1) of 0.16%. The liquid absorption capacity of Ca-DBs-3 was 30.43 ± 0.57 times its dry weight; the in vitro clotting time was comparable to QuikClot® zeolite; the hemostatic time and blood loss using the rat tail amputation model were 36.40 ± 2.52 s and 0.39 ± 0.12 g, which were 40.72% and 19.50% of QuikClot® zeolite, respectively. Ca-DBs-3 showed no apparent toxicity to L929 cells (cell viability > 80%) and was non-hemolysis (the hemolysis rate < 2%). This study prepared Ca-DBs-3 with a rapid hemostatic effect and good biocompatibility, providing a path to develop diatom biosilica hemostatic materials.

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Jung, Choong-Hwan, Young-Min Han i Sang-Jin Lee. "Characteristics of Porous YAG:Ce Nano-Powders Phosphor Fabricated by a Solution Combustion Synthesis". Journal of Nanoscience and Nanotechnology 21, nr 9 (1.09.2021): 4886–90. http://dx.doi.org/10.1166/jnn.2021.19259.

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A cerium-doped YAG (Y3Al5O12) phosphor is used as a rare-earth element phosphor for blue light absorption and yellow light emission for a white light source. A solution combustion synthesis, which is a method for producing nano-powder, is a reaction that is spontaneous ignition by reaction heat released through oxidation/reduction reaction between metal nitrate and fuel. Since the reaction speed is fast and it does not go through a separate firing process, it is a method of easily synthesizing nano-powder by simple process. In this study, YAG:Ce nano-powders were prepared by using various fuels in the combustion synthesis method. Depending on the kind of the additive fuel, the reaction of the combustion synthesis process was different, and the shape of the powder particles according to the fuels was also different. The agglomerated particles of nanoparticles were observed and the characteristics of YAG:Ce powders synthesized under various conditions were analyzed.

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Markovskyi, Anton, Vitaliy Gorbenko, Tetiana Zorenko, Karol Bartosiewicz, Alexander Fedorov i Yuriy Zorenko. "Development of Tb1.5Gd1.5Al5O12:Ce Single-Crystalline Film Converters for WLED Using a Liquid Phase Epitaxy Growth Method". Crystals 12, nr 12 (13.12.2022): 1814. http://dx.doi.org/10.3390/cryst12121814.

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The investigation of the structural, luminescent and photoconversion properties (color coordinates, correlated color temperature, color rendering index and luminous efficacy) of the single-crystalline films of Ce3+-doped Tb1.5Gd1.5Al5O12:Ce mixed garnet with variable film thickness was performed in this work. These film converters were grown on undoped Y3Al5O12 substrates using the liquid phase epitaxy technique. When combined directly with blue LEDs that were commercially available in the market, the developed garnet film converters were responsible for producing white light. The trend line on the color coordinate diagram was obtained for the first time for the Tb1.5Gd1.5Al5O12:Ce converters with the systematic variation in film thickness in the range of 45–82 µm. Under 464 nm blue LED excitation, the investigated converters with a thickness of 55 µm resulted in an ideal white color.

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Hu, Lijun, Zhichao Ding, Fei Yan, Kuan Li, Li Feng i Hongqing Wang. "Construction of Hexagonal Prism-like Defective BiOCL Hierarchitecture for Photocatalytic Degradation of Tetracycline Hydrochloride". Nanomaterials 12, nr 15 (5.08.2022): 2700. http://dx.doi.org/10.3390/nano12152700.

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Oxygen vacancy manipulation and hierarchical morphology construction in oxygen-containing semiconductors have been demonstrated to be effective strategies for developing high efficiency photocatalysts. In most studies of bismuth-based photocatalysts, hierarchical morphology and crystal defects are achieved separately, so the catalysts are not able to benefit from both features. Herein, using boiling ethylene glycol as the treatment solution, we developed an etching-recrystallization method for the fabrication of 3D hierarchical defective BiOCl at ambient pressure. The target hierarchical 3D-BiOCl is composed of self-assembled BiOCl nanosheets, which exhibit a hexagonal prism-like morphology on a micron scale, while simultaneously containing numerous oxygen vacancies within the crystal structure. Consequently, the target catalyst was endowed with a higher specific surface area, greater light harvesting capability, as well as more efficient separation and transfer of photo-excited charges than pristine BiOCl. As a result, 3D-BiOCl presented an impressive photocatalytic activity for the degradation of tetracycline hydrochloride in both visible light and natural white light emitting diode (LED) irradiation. Moreover, an extraordinary recycling property was demonstrated for the target photocatalyst thanks to its hierarchical structure. This study outlines a simple and energy-efficient approach for producing high-performance hierarchically defective BiOCl, which may also open up new possibilities for the morphological and crystal structural defect regulation of other Bi-based photocatalysts.

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Rozprawy doktorskie na temat "White light producing materials"

Zhao, Xinyue M. Eng Massachusetts Institute of Technology. "Commercialization of Quantum Dot White Light Emitting Diode technology". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37678.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2006.
Includes bibliographical references.
It is well known that the use of high-brightness LEDs for illumination has the potential to substitute conventional lighting and revolutionize the lighting industry over the next 10 to 20 years. However, successful penetration of this extremely large lighting market would require vast improvements in power conversion efficiencies, color index, light output per device and drastic reduction in cost. Quantum Dot white LED (QD WLED) technology may be one of the best choices, due to its higher energy efficiency, larger color render in index, better versatility and more importantly lower cost, compared to conventional blue LED plus YAG: Ce yellow phosphor technology. Due to the fundamental difference of the material structure, QD LEDs will win a steady position among existing white LED patents and a hybrid fabless plus IP business model has the best position to promote this technology to maximize its benefits and potential for the entire LED industry.
by Xinyue Zhao.
M.Eng.

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Soon, Chian Myau. "White light emitting diode as liquid crystal display backlight". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42159.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2007.
Includes bibliographical references.
The discovery of high brightness (white) light emitting diode (LED) is considered as a real threat to the current lighting industry in various applications. One of the most promising sectors would be using white LED to replace the current Cold Cathode Fluorescent Light (CCFL) technology as the backlight of the large screen Liquid Crystal Display (LCD) screen due to the fact that LCD is a rapidly booming market.
by Chian Myau Soon.
M.Eng.

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Little, Matthew Michael. "Feasibility of manipulating correlated color temperatures with a phosphor converted high-powered light emitting diode white light source". DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/332.

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In this thesis we examine the feasibility of developing a white light source capable of producing colors between 2500 and 7500 Kelvin on the black-body radiator spectrum by simply adjusting amperage to a blue and ultraviolet (UV) light emitting diode (LED). The purpose of a lighting source of this nature is to better replicate daylight inside a building at a given time of day. This study analyzes the proposed light source using a 385 nm UV LED, a 457 nm blue LED, a 479 nm blue LED, a 562 nm peak cerium doped yttrium aluminum garnet (YAG:Ce) phosphor, and a 647 nm peak selenium doped zinc sulfide (ZnS:Se) phosphor. Our approach to this study initially examined optical performance of yellow-emitting phosphor (YAG:Ce) positioned at specific distances above a blue LED using polydimethylsiloxane (PDMS) as a substrate. An understanding of how phosphor concentration within the PDMS, the thickness of the PDMS, and how substrate distance from the LED die affected light intensity and color values (determined quantitatively by utilizing the 1931 CIE 2° Standard Observer) enabled equations to be developed for various lens designs to efficiently produce white light using a 457 nm peak wavelength LED. The combination of two luminescent sources (457 nm LED and YAG:Ce) provided a linear trend on the 1931 CIE diagram which required a red illumination source to obtain Kelvin values from 2500 to 7500. Red-emitting phosphor (ZnS:Se), selected to compliment the system, was dispersed with YAG:Ce throughout PDMS where they were stimulated with a blue LED thereby enabling all desired Kelvin values with differing concentration lenses. Stimulating ZnS:Se with the addition of a UV LED did not provide the ability to change the color value of the set up to the degree required. Many other factors resulted in the decision to remove the UV LED contribution from the multi-Kelvin light source design. The final design incorporated a combination of ZnS:Se and YAG:Ce stimulated with a blue LED to obtain a 2500 Kelvin value. A separate blue LED provides the means to obtain 7500 Kelvin light and the other color values in between, with a linear approximation, by adjusting the amperages of both LEDs. In addition to investigating the feasibility of obtaining the Kelvin values from 2500 to 7500, this thesis also examined the problem of ZnS:Se’s inability to cure in PDMS and a method to create a lens shape to provide equal color values at all points above a phosphor converted LED source. ZnS:Se was found to be curable in PDMS if first coated with a low viscosity silicon oil prior to dispersion within PDMS. The lens configuration consists of phosphors equally distributed in PDMS and cured in the shape of a Gaussian distribution unique to multiple factors in LED-based white light design.

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Bohun, Michael H. "Several Non-Destructive Inspection Methods Applied to Quantify Fretting Fatigue Damage in Simulated Ti-6Al-4V Turbine Engine Dovetail Components". University of Dayton / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1332421987.

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Yangui, Aymen. "Etude des propriétés optiques et structurales des matériaux hybrides organiques-inorganiques à base de Plomb : émission de lumière blanche". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV030/document.

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Les matériaux hybrides organiques inorganiques ont attirés l'attention vue qu'ils présentent des propriétés optiques et optoélectroniques fascinantes comme la forte photoluminescence même à température ambiante. Cet axe de recherche relativement nouveau, sur cette famille de matériaux, offre une variété d’opportunités technologiques. Dans ce contexte, nous nous sommes intéressés par l'étude des propriétés optiques des deux matériaux hybrides organiques inorganiques (C6H11NH3)2[PbI4] et (C6H11NH3)2[PbBr4], et principalement leurs propriétés de luminescence. Les résultats montre que sous excitation dans l'ultraviolet, (C6H11NH3)2[PbBr4] émet de la lumière blanche, même à température ambiante, ce qui présente un grand intérêt de l'utilisation de ces matériaux comme source d'émission de la lumière blanche. L'origine de cette émission a été étudié par différentes techniques comme la photoluminescence résolution en temps
Inorganic organic hybrid materials have attracted a great attention do to their special structure and important optical such as the high luminescence, even at room temperature. This relatively new research on this family of materials, offers a variety of technological opportunities. In this context, we are interested in the study of optical properties of both inorganic and organic hybrid materials (C6H11NH3)2[PbI4] and (C6H11NH3)2[PbBr4], and mainly their luminescence properties. The results shows that under ultraviolet excitation, (C6H11NH3)2[PbBr4] show a strong white light emission, even at room temperature, which open a great interest in the use of these materials as a source of the white light emission. The origin of this large emission has been studied by different techniques such as the time resolved photoluminescence measurements

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Oliveira, Rafael Figueiredo de. "Evaluation of Proposed Natural Corrosion Inhibitors for X-52 Carbon Steel in Ethanol Media". University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1448385629.

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Onelli, Olimpia Domitilla. "Complex photonic structures in nature : from order to disorder". Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/273768.

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Structural colours arise from the interaction of visible light with nano-structured materials. The occurrence of such structures in nature has been known for over a century, but it is only in the last few decades that the study of natural photonic structures has fully matured due to the advances in imagining techniques and computational modelling. Even though a plethora of different colour-producing architectures in a variety of species has been investigated, a few significant questions are still open: how do these structures develop in living organisms? Does disorder play a functional role in biological photonics? If so, is it possible to say that the optical response of natural disordered photonics has been optimised under evolutionary pressure? And, finally, can we exploit the well-adapted photonic design principles that we observe in Nature to fabricate functional materials with optimised scattering response? In my thesis I try to answer the questions above: I microscopically investigate $\textit{in vivo}$ the growth of a cuticular multilayer, one of the most common colour-producing strategies in nature, in the green beetles $\textit{Gastrophysa viridula}$ showing how the interplay between different materials varies during the various life stages of the beetles; I further investigate two types of disordered photonic structures and their biological role, the random array of spherical air inclusions in the eggshells of the honeyguide $\textit{Prodotiscus regulus}$, a species under unique evolutionary pressure to produce blue eggs, and the anisotropic chitinous network of fibres in the white beetle $\textit{Cyphochilus}$, the whitest low-refractive index material; finally, inspired by these natural designs, I fabricate and study light transport in biocompatible highly-scattering materials.

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Lee, Reiyun, i 李睿勻. "Photoinduced Relaxation Dynamics of White-Light OLED Materials". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/98956101992145140082.

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Kuo, Chia Chen, i 郭家成. "Efficient Polymer White-Light-Emitting Devices Based on Phosphorescent Materials". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/44051185791789883748.

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碩士
長庚大學
光電工程研究所
98
This thesis is divided into two parts. we have fabricated a series of highly efficient white-emitting polymer devices possessing a single emitting layer containing a hole-transporting host polymer, PVK, and electron-transporting auxiliary (OXD7), These doubly doped devices all exhibited an intense white light emission and close to the standard white light region. In the first part, the white emitting polymer device doped with blue-light-emitting iridium phosphor (FIrpic) and red-light-emitting osmium phosphor (Os(fppz)),and electron-transporting layer fabricated by TPBi. The CIE of the first white emitting polymer device is (0.33, 0.35), the maximum luminescence efficiency of 19.8cd/A and the maximum external quantum efficiency of 10.8 % was achieved. In the second part, the white emitting polymer device doped with blue-light-emitting phosphor (FIrpic) and red-light-emitting osmium phosphor (Os(bpftz)), After the modification of electron transporting layer in these WPLEDs, the maximum forward viewing luminescence efficiency of 46.6 cd/A (79.2 cd/A for total viewing) and power efficiency of 29.1 lm/W (49.5 lm/W for total viewing) was achieved, which is comparable to those reported for the state-of-the-art vacuum deposited small molecule WOLEDs.

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Ping-I, Shih, i 施秉彝. "Blue and White Phosphorescent Organic Light -Emitting Diodes： Materials and Devices". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/27527004151813880554.

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博士
國立交通大學
應用化學系所
97
This thesis is divided into two parts, part A regarding the synthesis and characterization of two novel host materials for phosphorescent OLEDs; part B regarding the fabrication and character discussion of the highly efficient white polymer light emitting devices. In first section of part A, we report the synthesis and characterization of a novel silane/fluorene hybrid, TPSi-F, used as the host material for blue phosphorescent devices. TPSi-F is constructed by linking both tetraphenylsilane and phenyl substituted fluorene moieties through a non-conjugated, sp3-hybrided carbon atom (C-9) to enhance its thermal and morphological stabilities, while maintaining the much needed, higher singlet and triplet energy gap. Highly efficient sky-blue phosphorescent OLEDs were obtained when employing TPSi-F as the host and FIrpic as the guest, the maximum external quantum efficiency (max. EQE) of this device reached as high as 15 % (30.6 cd/A). Furthermore, upon switching the guest from FIrpic to a new blue phosphor FIrfpy, the saturated-blue OLEDs were realized with the max. EQE being 9.4 % (15.1 cd/A). These TPSi-F based blue phosphorescent devices show a 2-fold enhancement in the device efficiency, comparing with reference devices based on conventional host material mCP. In second section of part A, we report a novel host material TFTPA that contains a triphenylamine core and three 9-phenyl-9-fluorenyl peripheries, was effectively synthesized through a Friedel–Crafts-type substitution reaction. Owing to the presence of its sterically bulky 9-phenyl-9-fluorenyl groups, TFTPA exhibits a high glass transition temperature (186 °C) and is morphologically and electrochemically stable. In addition, as demonstrated from atomic force microscopy measurements, the aggregation of the triplet iridium dopant is significantly diminished in the TFTPA host, resulting in a highly efficient full-color phosphorescence. The performance of TFTPA-based devices is far superior to those of the corresponding mCP- or CBP-based devices, particularly in blue- and red-emitting electrophosphorescent device systems. The efficiency of the FIrpic-based blue-emitting device reached 12% (26 cd/A) and 18 lm/W at a practical brightness of 100 cd/m2; the Ir(piq)2acac-based red-emitting device exhibited an extremely low turn-on voltage (2.6 V) and a threefold enhancement in device efficiency (9.0 lm/W) relative to those of reference devices based on the CBP host material. In part B, we have fabricated a series of highly efficient white emitting polymer devices possessing a single emitting layer containing a hole-transporting host polymer, PVK, and electron-transporting auxiliary (PBD or OXD7), doped with blue-light-emitting dye and red-light-emitting osmium phosphor. These doubly doped devices all exhibited an intense white light emission and close to the standard white light region. After the modified of electron transporting layer in these WPLEDs, the maximum forward viewing luminescence efficiency of 36.1 cd/A (61.4 cd/A for total viewing) and power efficiency of 23.4 lm/W (39.8 lm/W for total viewing) was achieved, which is comparable to those reported for the state-of-the-art vacuum deposited small molecule WOLEDs.

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Książki na temat "White light producing materials"

Masuku, Bianca, Michelle Willmers, Henry Trotter i Glenda Cox, red. UCT Open Textbook Journeys. UCT Libraries, 2021. http://dx.doi.org/10.15641/0-7992-2551-8.

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The UCT Open Textbook Journeys monograph tells the stories of 11 academics at the University of Cape Town who embarked on open textbook development initiatives in order to provide their students with more accessible and locally relevant learning materials. Produced by the Digital Open Textbooks for Development (DOT4D) initiative, the monograph contributes towards a better understanding of open textbook production by providing details related to authors’ processes and their reflections on their work. The collection aims to provide rich anecdotal evidence about the factors driving open textbook activity and shed light on how to go about conceptualising and producing open textbooks, and to aid the articulation of emerging open textbook production models that advance social justice in higher education.

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Segal, David. Let There Be Lights. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198804079.003.0006.

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Chapter 6 describes solid-state lighting. It covers electroluminescence light-emitting diodes, quantum dots, organic light-emitting diodes (OLEDs), liquid crystals and liquid crystal displays. The importance of synthesis of high purity semiconductors for lighting applications is stressed. Use of materials to produce clear white light is outlined. Association structures in solution such as micelles and liquid crystals are described.

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Lent, John A., i Xu Ying. Comics Art in China. University Press of Mississippi, 2017. http://dx.doi.org/10.14325/mississippi/9781496811745.001.0001.

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In the most comprehensive and authoritative source on this subject, this book covers almost all comics art forms in mainland China, providing the history from the nineteenth century to the present as well as perspectives on both the industry and the art form. This volume encompasses political, social, and gag cartoons, lianhuanhua (picture books), comic books, humorous drawings, cartoon and humor periodicals, and donghua (animation) while exploring topics ranging from the earliest Western-influenced cartoons and the popular, often salacious, 1930s humor magazines to cartoons as wartime propaganda and comics art in the reform. Coupling a comprehensive review of secondary materials (histories, anthologies, biographies, memoirs, and more) in English and Chinese with the artists' actual works, the result spans more than two centuries of Chinese animation. Structured chronologically, the study begins with precursors in early China and proceeds through the Republican, wartime, Communist, and market economy periods. Based primarily on interviews the editors conducted with over one hundred cartoonists, animators, and other comics art figures, Comics Art in China sheds light on tumult and triumphs. Lent and Xu describe the evolution of Chinese comics within a global context, probing the often-tense relationship between expression and government, as well as proving that art can be a powerful force for revolution. Enhanced with over one hundred black-and-white and color illustrations, this book stands out as not only the first such survey in English, but perhaps the most complete one in any language.

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Części książek na temat "White light producing materials"

Sharma, Geeta, i Pankaj Poddar. "Organic–Inorganic Hybrids for White-Light Phosphors". W Hybrid Phosphor Materials, 105–18. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90506-4_4.

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Zhou, X., Jun Gong, Y. Liu i J. Zhou. "A White Light Interference Distributed Optical Fiber Temperature Sensor". W Key Engineering Materials, 575–82. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-977-6.575.

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Kubo, Yuji. "White-Light Emissive Materials Based on Supramolecular Approach". W Progress in the Science of Functional Dyes, 409–43. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4392-4_12.

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Lenk, Simone, Michael Thomschke i Sebastian Reineke. "White-Light Emitting Materials for Organic Light-Emitting Diode-Based Displays and Lighting". W Materials for Solid State Lighting and Displays, 231–72. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119140610.ch6.

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Fan, Bingfeng, Yi Zhuo i Gang Wang. "White Light-Emitting Diode: Fundamentals, Current Status, and Future Trends". W Handbook of GaN Semiconductor Materials and Devices, 463–87. Boca Raton : Taylor & Francis, CRC Press, 2017. | Series: Series in optics and optoelectronics: CRC Press, 2017. http://dx.doi.org/10.1201/9781315152011-14.

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Wu, Zhi Jun, Wen Long Jiang, Shufen Chen, Yi Zhao, Jingying Hou i Shi Yong Liu. "Molecular Organic White Light-Emitting Devices Fabricated by a Simple Way through Nondoped Process". W Materials Science Forum, 1905–8. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.1905.

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Arankalle, Avinash. "Advances in Light Weight Materials for Body-in-White (BIW)". W Lecture Notes in Mechanical Engineering, 517–25. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1771-1_55.

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Zhang, Y. Z., C. X. Li, Y. Wang i L. L. Ran. "Thermal simulation and analysis of high-power white LED light". W Advances in Materials Science, Energy Technology and Environmental Engineering, 227–30. P.O. Box 11320, 2301 EH Leiden, The Netherlands, e-mail: Pub.NL@taylorandfrancis.com , www.crcpress.com – www.taylorandfrancis.com: CRC Press/Balkema, 2016. http://dx.doi.org/10.1201/9781315227047-44.

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Xie, Wenfa, i Shi Yong Liu. "High-Efficient Non-Doped Type White Organic Light-Emitting Devices Using an Electron/Exciton Blocker". W Materials Science Forum, 1799–804. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.1799.

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Chen, Liang Chia, Wei Chieh Kao i Yao Ting Huang. "Automatic Full-Field 3-D Profilometry Using White Light Confocal Microscopy with DMD-Based Fringe Projection". W Materials Science Forum, 361–66. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-990-3.361.

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Streszczenia konferencji na temat "White light producing materials"

Lanteigne, David J., Tracy D. Hudson i Don A. Gregory. "Matched spatial filtering using a new photopolymer". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.md5.

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The Polaroid photopolymer holographic material designated as DMP-128 is a phase-only recording medium that offers the high efficiency of dichromated gelatin, yet can be stored in ordinary room conditions after a simple four-step developing process. Light polymerizes a vinyl monomer in the film, producing a modulation of the film’s index of refraction. The film is activated by placing it in air of 51% relative humidity for 3 min. Developing consists of a white-light flood, developing bath, rinse, and dry. Simple plane wave diffraction gratings have been made that are 70% efficient. DMP-128 has been used to make a matched spatial filter. The input scene was an 18-cycle spoked-wheel pattern transparency illuminated in He-Ne light. The incidence angle of the reference beam was 21°. The object/reference intensity ratio was 3:1; total exposure was in excess of 5 mJ/square centimeter. After developing, the filter plate was replaced in its original position and addressed with the object beam. 2.4% of the incident energy was diffracted into the correlation. The peak signal-to-noise (scattered light) ratio was 26.4 (14.2 dB), and the correlation was invariant to translations of the input scene.

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Jovanova, Jovana, Filip Dobrivojevski i Martina Dimoska. "Design of Bio-Inspired Mobile Robot Using Piezoelectric Transducers As Drives". W ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3819.

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This paper focuses on the design and development of a bio-inspired mobile robot using piezoelectric transducers as drives. The design of the device aimed to imitate the trajectory movement of a crawl-like animal. Design constraints as producing controlled movement with piezoelectric transducer, as well as the combination of multiple piezoelectric patches into one mobile robot are presented in their practical aspects. The robot uses 2 piezoelectric transducers as main drives, but also as main structural components of the device. The patches are connected with a thin light rod, and the kinematic of movement is achieved with 4 tiny wooden legs connected on each of the patches. The project investigates the possibility and effectiveness of the piezoelectric transducers for movement of the bio-inspired mobile robot. From conceptual development, to the mechanical design and control, the mobile robot is used to test different trajectories of movement. Ni RIO Evaluation kit has been incorporated as a real-time and FPGA control platform for the mobile robot while using Labview programing environment. To accomplish complex trajectories of movement the velocity of the robot was measured for straight line and rotation of the robot.

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Alwan, Jamil M., Chi-Chin Wu, Thomas H. Sheng, Chunhui (Kevin) Li i Yi Liu. "Light Weight Steel Technology Used in a Vehicle Design: Safety CAE Analysis". W ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/amd-25430.

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Abstract The automotive industry is facing new environmental requirements that call for more stringent rules to protect the environment and reduce material and resources usage. As such, the automotive industry is in more need to reduce fuel consumption and control emissions in order to meet the new environmental requirements. One of the methods that helps in acheiving lower fuel consumption targets is weight reduction. Making cars lighter sounds plausable, but is it acheivable without affecting vehicle Safety as well as other customer demands for more comfort and better vehicle performance (Criteria that are a must in today’s stringent safety requirements and competitive environment.). The body-in-white (BIW) accounts for about 25% of the total vehicle weight, and thus it provides a great opportunity for weight reduction. However, the challenge is not only to reduce the vehicle’s BIW weight, but also to maintain competitive vehicle functionality in Safety, NVH and Durability. The studied technologies include: Generic Body Architecture, Tailor Welded Blanks, Ultra High Strength Steel, Structural Foams, and Structural Adhesives. Each of these technologies was benchmarked in terms of weight savings, vs Safety, NVH, and Durability functionalities. The models that were used for the technology prove outs are based on generic modified Body Architecture CAE models. It was shown that the total weight savings acheived from architecture alone was 24 lb (out of 707 lb initial BIW weight, thus making the weight savings close to 3.4%). In addition, the combination of Tailor welded blanks and Ultra high strength steel has resulted in an 80 lb reduction in the BIW weight, which is close to 11.3%. Structural foams showed an effective increase in roof crush strength, and showed potential enhancement for frontal crash pulses as well as potential shortening of front ends. On the other hand, structural adhesives showed enormous NVH benefits in stiffness with as little as 1% energy absorption enhancement for crash. Thus producing the perfect method to compensate the reduced body stiffness due to sheet metal gage reduction and replacement with Ultra High strength steel. By such both safety and NVH functionalities are complemented without weight increase.

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Jedenmalm, Anneli, Walther Leardini, Mara Zavalloni i Saverio Affatato. "Effect of Head Surface Roughness and Sterilization Method on Wear of UHMWPE Acetabular Cups: Preliminary Hip Joint Simulator Results". W ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95512.

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More than one million hip joint replacements are performed each year in the world. However, the implants do not last forever due to material limitations, even though the operation is successful. The most common material combination used today is a CoCr head articulating against an UHMWPE (Ultra High Molecular Weight Polyethylene) acetabular cup. Several investigations have shown that the metal head is roughened inside the body and thus accelerating wear of the polymer cup. The sterilization method is also known to have effect on the wear properties. In vitro wear tests are however usually performed with as new implants. This investigation aimed at study the impact of head surface roughness on wear of both sterilized and non-sterilized acetabular cups. A total of nine acetabular cup and head pairs were wear tested in a hip joint simulator for 2Million cycles (Mc) with bovine calf serum as lubricant. Wear was determined by weighing of all cups. The heads were of CoCrMo and the average initial head surface roughness was 15nm (Ra), measured with a white light interference profilometer. The roughening was produced with a SiC paper producing circular multidirectional wear tracks to a surface roughness of about 400nm (Ra). The cups were of UHMWPE and the sterilized cups were 3Mrad gamma-radiated in nitrogen. The surface roughness after wear test was unchanged for the roughened heads, while the initially smooth heads were slightly roughened. Preliminary results show that the rough heads increase the wear of the cups 2-fold. The γ-irradiation affected both wear- and soak rate.

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Morehead, Mason, i Yong Huang. "Machinability Research and Workpiece Microstructure Characterization in Turning of Ultrafine Grained Copper". W ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82638.

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Various methods for production of bulk ultrafine grained/nanostructured materials have been developed. They can be classified into two categories based on their approaches: the bottom-up and top-down approaches. Recently, a top-down approach named equal channel angular extrusion (ECAE), a form of severe plastic deformation (SPD), has been gaining more and more attention in making bulk ultrafine grained/nanostructured materials. Such bulk materials are favored for there high strength, wear resistance, ductility, and high strain-rate superplasticity, which makes them suitable for light weight engineering and medical applications. Further precision machining work is normally indispensable for structural applications after bulk ultrafine grained/nanostructured materials are manufactured from any SPD processes. While researchers are increasingly interested in commercially producing SPD-processed bulk ultrafine grained/nanostructured materials and characterizing their chemical and physical properties, the machinability and microstructure stability issues in precision machining such materials are frequently ignored. Using an ECAE processed bulk ultrafine grained copper bar as an example, this study investigates the machinability as well as machining-induced workpiece microstructure variation of such ECAE processed materials in precision turning. Tool cutting performance in turning the ultrafine grained copper bar is also compared with that of the regular copper bar.

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Shen, Chao, Ee-Ning Ooi, Xiaobin Sun, Boon S. Ooi i Tien Khee Ng. "Study on laser-based white light sources". W Light-Emitting Devices, Materials, and Applications, redaktorzy Martin Strassburg, Jong Kyu Kim i Michael R. Krames. SPIE, 2019. http://dx.doi.org/10.1117/12.2511094.

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Hidalgo Alcalde, Pedro, Jaime José Dolado Fernández i Bianchi Méndez. "Efficient white-light emission from Zn2GeO4 nanomaterials". W Oxide-based Materials and Devices X, redaktorzy Ferechteh H. Teherani, David C. Look i David J. Rogers. SPIE, 2019. http://dx.doi.org/10.1117/12.2511254.

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Parasumanna, Ajeet. "Bimetal Mixture Forging Process and Its Influence on Intermetallic Phase Seam Properties for An Automotive Component". W FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2020-mml-052.

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In today’s scenario, the fuel cost and stricter norms related to environmental protection are exponentially increasing and thus lightweight forging is gaining importance which directly enhances the efficiency of the entire vehicle leading to reduction in pollution and fuel consumption. Material substitution with lighter alloy is one of the solutions but the part design is a constraint to implement this approach in structural load bearing parts which undergoes dynamic loading in its lifecycle. Mixture forging is a solid / Semi solid hot-forming process of two different materials while plastic deformation occurs. In mixture forging of steel-aluminum parts there is a formation of intermetallic phases and the diffusion occurs between two materials. This paper is addressing the challenges in forging process and especially producing bimetal product by adapting to currently followed forging practices and infrastructure. In this study, a component forging process is designed using finite element computation tool and then forged in two stages followed by application of mixture forging concept during forging operation to achieve light weighting. The two different materials used are 42CrMo4 steel for high strength at the outer case and AA6061 aluminium alloy for a lightweight core. The thickness of the intermetallic phase seam achieved is less than 10 μm and its material characterisation is carried out using SEM analysis. Micro-hardness measurement was taken of the intermetallic phase and is found to be 855 (HV 0.01) which is brittle in nature. The component thus forged is found to be 27% lighter than the component produced by steel forging. This technology is a part of the multi material joining technology using forging process wherein conventional equipment can be used. The bulk forming process achieving multi material solution is a innovative process and can lead to lighweighting of various circular parts and shaft primarily in the transmission of ICE and Electric Vehicles.

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Reddy, Bommareddi Rami, Jade Douglas, Vernessa M. Edwards i kristopher Liggins. "White-light emission characteristics of terbium-doped crystals". W Optical Components and Materials XV, redaktorzy Michel J. Digonnet i Shibin Jiang. SPIE, 2018. http://dx.doi.org/10.1117/12.2286543.

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Goodson, Mersaydes, i Bommareddi Rami Reddy. "Investigation of phosphate glasses for white-light emission". W Optical Components and Materials XVII, redaktorzy Michel J. Digonnet i Shibin Jiang. SPIE, 2020. http://dx.doi.org/10.1117/12.2539840.

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Raporty organizacyjne na temat "White light producing materials"

Tang, Ching, i Shaw Chen. Development and Utilization of Host Materials for White Phosphorescent Organic Light-Emitting Diodes. Office of Scientific and Technical Information (OSTI), maj 2013. http://dx.doi.org/10.2172/1165602.

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Kippelen, Bernard. Stable White Organic Light-emitting Diodes Enabled by New Materials with Reduced Excited State Lifetime (Final Report). Office of Scientific and Technical Information (OSTI), czerwiec 2020. http://dx.doi.org/10.2172/1764158.

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Ovalle, Samuel, E. Viamontes i Tony Thomas. Optimization of DLP 3D Printed Ceramic Parts. Florida International University, październik 2021. http://dx.doi.org/10.25148/mmeurs.009776.

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Digital Light Processing (DLP) 3D printing allows for the creation of parts with advanced engineering materials and geometries difficult to produce through conventional manufacturing techniques. Photosensitive resin monomers are activated with a UV-producing LCD screen to polymerize, layer by layer, forming the desired part. With the right mixture of photosensitive resin and advanced engineering powder material, useful engineering-grade parts can be produced. The Bison 1000 is a research-grade DLP printer that permits the user to change many parameters, in order to discover an optimal method for producing 3D parts of any material of interest. In this presentation, the process parameter optimization and their influence on the 3D printed parts through DLP technique will be discussed. The presentation is focused on developing 3D printable slurry, printing of complex ceramic lattice structures, as well as post heat treatment of these DLP-produced parts.

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