標題: | High color rendering white light-emitting-diode illuminator using the red-emitting Eu(2+)-activated CaZnOS phosphors excited by blue LED |
作者: | Kuo, Te-Wen Liu, Wei-Ren Chen, Teng-Ming 應用化學系 Department of Applied Chemistry |
公開日期: | 12-四月-2010 |
摘要: | A red phosphor CaZnOS:Eu(2+) was synthesized by solid state reaction and has been evaluated as a candidate for white LEDs. For this material, the XRD, PL, PL excitation (PLE) and diffuse reflection spectra have also been investigated. CaZnOS:Eu(2+) reveals a broad absorption band and good color purity. By utilizing a mixture of red-emitting CaZnOS:Eu(2+), green-emitting (Ba,Sr)(2)SiO(4):Eu(2+) and yellow-emitting Y(3)Al(5)O(12):Ce(3+) as light converters, an intense white InGaN-based blue-LED (similar to 460 nm) was fabricated to exhibit a high color-rendering index Ra of 85 at a correlated color temperature of 4870 K. Based on the results, we are currently evaluating the potential application of CaZnOS:Eu(2+) as a red-emitting blue-chip convertible phosphor. (c) 2010 Optical Society of America |
URI: | http://hdl.handle.net/11536/5518 |
ISSN: | 1094-4087 |
期刊: | OPTICS EXPRESS |
Volume: | 18 |
Issue: | 8 |
起始頁: | 8187 |
結束頁: | 8192 |
顯示於類別: | 期刊論文 |