预涂有Sr3SiO5:Ce3+,Li+荧光粉的蓝色和近紫外发光二极管发出的白光。

White light emission from blue and near ultraviolet light-emitting diodes precoated with a Sr3SiO5:Ce3+,Li+ phosphor.

作者信息

Jang Ho Seong, Jeon Duk Young

机构信息

Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea.

出版信息

Opt Lett. 2007 Dec 1;32(23):3444-6. doi: 10.1364/ol.32.003444.

DOI:10.1364/ol.32.003444

PMID:18059961

Abstract

White-light-emitting diodes (WLEDs) were fabricated by combining a yellow Sr3SiO5:Ce3+, Li+ phosphor with a blue light-emitting diode (LED) (460 nm chip) or a near ultraviolet (n-UV) LED (405 nm chip), respectively. Color temperature (Tc) of Sr3SiO5:Ce3+, Li+-based WLEDs could be tuned from 6500 to 100,000 K (blue LED pumping) and from 4900 to 50,000 K (n-UV LED pumping) without mixing with other phosphors. The blue LED-pumped WLED showed excellent white light (luminous efficiency=31.7 lm/W, Tc=6857 K) at 20 mA. This WLED showed a stable color coordinates property against an increase of the forward current. An n-UV LED-pumped WLED also showed bright white light (25.0 lm/W, 5784 K) at 20 mA.

摘要

通过分别将黄色的Sr3SiO5:Ce3+、Li+荧光粉与蓝色发光二极管（LED）（460纳米芯片）或近紫外（n-UV）LED（405纳米芯片）相结合，制造出了白色发光二极管（WLED）。基于Sr3SiO5:Ce3+、Li+的WLED的色温（Tc）可以在不与其他荧光粉混合的情况下，从6500 K调节到100,000 K（蓝色LED泵浦）以及从4900 K调节到50,000 K（n-UV LED泵浦）。蓝色LED泵浦的WLED在20毫安时表现出优异的白光（发光效率 = 31.7流明/瓦，Tc = 6857 K）。这种WLED在正向电流增加时表现出稳定的色坐标特性。一个n-UV LED泵浦的WLED在20毫安时也表现出明亮的白光（25.0流明/瓦，5784 K）。