%0 Journal Article
%T The development of silicate matrix phosphors with broad excitation band for phosphor-convered white LED
%A XiXian Luo
%A WangHe Cao
%A Fei Sun
%J Chinese Science Bulletin
%@ 1861-9541
%D 2008
%I 
%R 10.1007/s11434-008-0392-4
%X This paper briefly reviews the recent progress in alkaline earth silicate host luminescent materials with broad excitation band for phosphor-convered white LED. Among them, the Sr-rich binary phases (Sr, Ba, Ca, Mg)2SiO4:Eu2+ and (Sr, Ba, Ca, Mg)3SiO5:Eu2+ are excellent phosphors for blue LED chip white LED. They have very broad excitation bands and exhibit strong absorption of blue radiation in the range of 450每480 nm. And they exhibit green and yellow-orange emission under the InGaN blue LED chip radiation, respectively. The luminous efficiency of InGaN-based (Sr, Ba, Ca, Mg)2SiO4:Eu2+ and (Sr, Ba, Ca, Mg)3SiO5:Eu2+ is about 70每80 lm/W, about 95%每105% that of the InGaN-based YAG:Ce, while the correlated color temperature is between 4600每11000 K. Trinary alkaline earth silicate host luminescent materials MO(M=Sr, Ca, Ba)-Mg(Zn)O-SiO2 show strong absorption of deep blue/near-ultraviolet radiation in the range of 370每440 nm. They can convert the deep blue/near-ultraviolet radiation into blue, green, and red emissions to generate white light. The realization of high-performance white-light LEDs by this approach presents excellent chromaticity and high color rendering index, and the application disadvantages caused by the mixture of various matrixes can be avoided. Moreover, the application prospects and the trends of research and development of alkaline earth silicate phosphors are also discussed.
%K white LED
%K broad excitation band
%K silicate matrix
%U http://link.springer.com/article/10.1007/s11434-008-0392-4