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Multilayer design of hybrid phosphor film for application in LEDs
Affiliation:1. Department of Material Science and Engineering, Izmir Institute of Technology, Izmir, Turkey;2. Vestel Electronics, LED Lighting R&D Department, O.S.B., 45030, Manisa, Turkey;1. College of Applied Science, Harbin University of Science and Technology, Harbin 150080, China;2. Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150080, China;3. Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA;1. College of Physics, Sichuan University, Chengdu 610064, China;2. College of Information Science and Engineering, Northeastern University, Shenyang 110004, China;3. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;1. Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Building 107, 1113 Sofia, Bulgaria;2. Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bonchev str., Building 11, Sofia 1113, Bulgaria;3. Institute of Solid State Physics, Acad. G. Nadjakov, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria;1. New Technologies – Research Centre, University of West Bohemia, Univerzitni 8, 306 14 Pilsen, Czech Republic;2. Semiconductor Photonics and Integrated Lightwave System (SPILS), Tun Abdul Razak Laser Lab Laboratory (TAReL), School of Microelectronic Engineering, Universiti Malaysia Perlis (UniMAP), Pauh Putra Main Campus, Jalan Arau-Changlun, 02600 Arau, Perlis, Malaysia;3. Center of Excellence Geopolymer and Green Technology, School of Material Engineering, University Malaysia Perlis, 01007 Kangar, Perlis, Malaysia;4. Department of Electrical and Electronic Engineering, Faculty of Engineering, National Defence University of Malaysia (UPNM), Kem Sungai Besi, 57000 Kuala Lumpur, Malaysia;5. Department of Physics and Astronomy, College of Science, P.O. Box 2455, King Saud University, Riyadh 11451, Saudi Arabia;6. Department of Instrumentation and Control Engineering, Faculty of Mechanical Engineering, CTU in Prague, Technicka 4, 166 07 Prague 6, Czech Republic;1. Key Laboratory of Transparent and Opto-functional Advanced Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, China;2. Analysis and Testing Center for Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;3. Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China;4. Key Laboratory Science and Technology on High Energy Laser, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China;5. Department of Physics, Shanghai Normal University, Shanghai, 200234, China
Abstract:Crosslinked polydimethylsiloxane (PDMS) composite coatings containing luminescent micrometer-sized yellow Y3Al5O12:Ce3+ (YAG:Ce3+) particles were prepared by spraying for potential applications in solid-state lighting. Blue light was down converted by phosphor particles to produce white light, yet poor color properties of YAG:Ce3+ stemmed from a deficiency of red. When nitride-based red phosphor was simply blended into the system, the electrostatic interaction of negatively charged YAG:Ce3+ and positively charged red phosphor particles caused remarkable clustering and heterogeneity in particle dispersion. Consequently, the light is dominantly blue and shifted to cold white. In other case, phosphor particles were sprayed onto the diffused polycarbonate substrate in stacked layers. Coatings with >80% inorganic content by mass with a thickness of 60 μm were subjected to thermal crosslinking, which the presence of the phosphor particles obstructed, presumably due to the hindrance of large phosphor particles in the diffusion of PDMS precursors. The coating of YAG:Ce3+ first followed by red phosphor in stacked layers produced better light output and color properties than the coating obtained by spraying the mixture at once. Monte Carlo simulation validated the hypothesis.
Keywords:Phosphor converted w-LED  PDMS  Remote phosphor  Spray coating  White light  PDMS"}  {"#name":"keyword"  "$":{"id":"kwrd0045"}  "$$":[{"#name":"text"  "_":"Polydimethylsiloxane  CIE"}  {"#name":"keyword"  "$":{"id":"kwrd0055"}  "$$":[{"#name":"text"  "_":"Commission Internationale de I’éclairage  CRI"}  {"#name":"keyword"  "$":{"id":"kwrd0065"}  "$$":[{"#name":"text"  "_":"Color Rendering Index  CCT"}  {"#name":"keyword"  "$":{"id":"kwrd0075"}  "$$":[{"#name":"text"  "_":"Correlated Color Temperature  FTIR"}  {"#name":"keyword"  "$":{"id":"kwrd0085"}  "$$":[{"#name":"text"  "_":"Fourier Transform Infrared Spectroscopy  Cerium doped Yttrium Aluminum Garnet  Europium doped Strontium Silicon Nitride
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