电子器件2008，Vol.31Issue(1)：381-384,204-205,6.
蓝光 LEDs 的转换荧光粉发光效率的测量
Measurements of Luminous Efficacies of Conversion Phosphors for Blue Emitting LEDs
Jack Silver 1Robert Withnall 1Anthony Liprnan1
作者信息
- 1. 布鲁纳尔大学豪尔夫逊材料研究处理中心,Uxbridge,Middle,UB8,3PH,英国
- 折叠
摘要
Abstract
In this work we investigate the shift of the colour point of the YAG.Ce phosphor towards the red when Y is substituted by Gd in the YAG lattice or when Pr is added as a co-activator with Ce. We also de-scribe efficiency measurements carried out on in-house samples of (Y, Gd) AG: Ce and YAG. Ce, Pr phos- phors when excited with 470 nm light. We show herein that the luminous efficacies of the (Y,Gd)AG.Ce and YAG..Ce,Pr phosphors decrease with Gd and Pr concentrations, respectively. Another phosphor that we and others have used for colour conversion of blue LED light is SrGa2S4:Eu. At room temperature this phosphor is very efficient, theoretically having a luminous efficacy that is more than 33 % higher than that of YAG.Ce. Luminous efficacy measurements on this phosphor show that the method of preparation is a major factor in the performance of the phosphor. When applied as an external screen phosphor in front of one or more blue LEDs, we have measured luminous efficacies up to 364 lm/W.关键词
YAG/Ce/Pr荧光粉/(Y/Gd)AG/Ce荧光粉/SrGa2S4/Eu荧光粉/发光效率/pcLEDKey words
YAG:Ce/ Pr phosphors/ (Y,Gd) AG:Ce phosphors/ SrGa2S4:Eu phosphors/ luminous efficacy/ poLED分类
信息技术与安全科学引用本文复制引用
Jack Silver,Robert Withnall,Anthony Liprnan..蓝光 LEDs 的转换荧光粉发光效率的测量[J].电子器件,2008,31(1):381-384,204-205,6.
