A low sintering temperature glass based on SiO2–P2O5–ZnO–B2O3–R2O system for white LEDs with high color rendering index |
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| Authors: | Seonghyeon Kim Hyun‐A Park Won Bin Im Jong Heo Jae‐Young Choi Woon Jin Chung |
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| Affiliation: | 1. Institute for Rare Metals & Division of Advanced Materials Engineering, Kongju National University, Cheonan, Chungnam, Korea;2. Department of Materials Science and Engineering, Chonnam National University, Gwangju, Korea;3. Department of Materials Science and Engineering and Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, Korea;4. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggido, Korea |
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| Abstract: | A low sintering temperature glass based on the SiO2–P2O5–ZnO–B2O3–R2O (R=K and Na) system was studied as a matrix for embedding phosphors to fabricate color tunable white LEDs. The proposed system, which uses no heavy‐metal elements and can be sintered at 500°C, incorporates thermally weak commercial phosphors such as CaAlSiN3:Eu2+ to produce phosphor‐in‐glasses (PiGs). Changing the mixing ratio of glass to phosphors affected the photo‐luminescence spectra and color coordinates of the PiGs when mounted on a blue LED. The color rendering index (CRI) and color correlated temperature (CCT) of the LEDs were also varied with the mixing ratio, providing color tunable white LEDs. A high CRI, up to 93, as well as highly improved thermal stability were obtained, along with a low sintering temperature compared to other glass systems, suggesting the practical feasibility of the proposed system. |
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| Keywords: | glass low temperature optical materials phosphors sintering |
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