摘要
Instead of developing a novel red phosphor individually, this work proposes the production of white light by combining a near-ultraviolet/ultraviolet diode chip with blue and special yellow phosphors: the yellow phosphor includes the red and green components with high color saturation. The availability of this scheme is demonstrated by preparing a white light-emitting diode (WLED) with color rendering index (Ra) up to 90.3. The desired single-mass yellow phosphor is successfully screened out from the YVO4:Bi3+,Eu 3+ system by using a combinatorial chemistry approach. When the emission color and luminous efficiency are both considered, the best composition for producing white light is (Y1-s-tBisEu t)VO4 with 0.040 ≤ s ≤ 0.050 and 0 < t ≤ 0.015. The red component that is required for a high-Ra WLED is obtained through sensitizing luminescence of Eu3+ by Bi3+ in a YVO 4 host; meanwhile, both Bi3+ and Eu3+ emission are improved by keeping the Bi3+ and Eu3+ contents close to the critical concentration.
原文 | 英語 |
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頁(從 - 到) | 587-594 |
頁數 | 8 |
期刊 | Journal of Combinatorial Chemistry |
卷 | 12 |
發行號 | 4 |
DOIs | |
出版狀態 | 已發佈 - 2010 7月 12 |
ASJC Scopus subject areas
- 一般化學