Luminescence characterization of (Ca1−xSrx)(S1−ySey):Eu,M (M = Sc and Y) for high color rendering white LED |
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Authors: | Jung-Sik Shin Hyun-Joon Kim Yong-Kwang Jeong Kwang-Bok Kim Jun-Gill Kang |
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Affiliation: | 1. Department of Chemistry, Chungnam National University, Gung-Dong Yusung-Goo, Daejeon 305-764, Republic of Korea;2. Kumho Electric Inc., 64-1 Bongmyung-Ri, Namsa-Myun, Youngin, Gyeonggi-Do 449-883, Republic of Korea |
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Abstract: | The highly efficient red phosphors (Ca1−xSrx)(S1−ySey):Eu2+,M3+ (M = Sc and Y) were prepared, starting from CaCO3, SrCO3, Eu2O3, Sc2O3, Y2O3, S, and SeO2 with a flux, by a conventional solid-state reaction. The optimized red phosphors converted 11.8% (Sc3+) and 11.7% (Y3+) of the absorbed blue light into luminescence. These quantum values are much higher than Q = 3.0% of CaS:Eu2+. For the fabrication of light-emitting diodes (LEDs), the prepared phosphors were coated with MgO from non-aqueous solution to overcome their weakness against moisture. White LEDs were fabricated by pasting the prepared red phosphors and the yellow YAG:Ce3+ phosphor on an InGaN blue chip (λems = 446.5 nm). The incorporation of the red phosphor to the YAG:Ce3+ phosphor resulted in an improved color rendering index (Ra) from 70 to 80. |
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Keywords: | A. Optical materials B. Chemical synthesis C. Photoluminescence spectroscopy D. Optical properties |
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