The thermal stability performances of the color rendering index of white light emitting diodes with the red quantum dots encapsulation |
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| Affiliation: | 1. School of Material Science and Engineering, Shanghai University, Shanghai 200072, China;2. Key Laboratory of Advanced Display and System Applications, Shanghai University, Ministry of Education, Shanghai 200072, China;1. National Research Tomsk Polytechnic University, Lenin Avenue 30, 634050 Tomsk, Russia;2. Tomsk State University of Architecture and Building, Soljanoj Street, 2 Tomsk, Russia;3. L.N. Gumilyov Eurasian National University, Astana, Kazakhstan;1. Lab of Printing & Packaging Material and Technology-Beijing Area Major Laboratory, Beijing Institute of Graphic Communication, Beijing 102600, PR China;2. Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, PR China;1. College of Mechanical and Materials Engineering, Jiujiang University, Jiangxi 332005, PR China;2. College of Science, Jiujiang University, Jiujiang 332005, PR China;1. School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China;2. Department of Electronic Engineering, City University of Hong Kong, Kowloon, Hong Kong, China |
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| Abstract: | Red phosphors are the traditional material used to improve the color rendering index (CRI) of white light emitting diode (WLEDs). In this paper, red quantum dots (QDs) were fabricated and coated on the blue LED chip to replace the red phosphors. By comparing the thermal performances of the CRI for the two WLEDs, we found that WLEDs with the encapsulation of yellow phosphors and red QDs exhibited higher CRI and lower sensitivity to temperature than those with the encapsulation of yellow and red phosphors. The CRI of WLEDs with yellow phosphors and red QDs was 90.9, and its range ability was only 0.3 when the environment temperature changed from 25 °C to 100 °C, while the CRI of WLEDs with yellow and red phosphors was as low as 81.8, and the change of CRI was 2.2 during the same temperature variation. |
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| Keywords: | LED Quantum dot Stable CRI Photoluminescence spectroscopy Double-deck |
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