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《Chinese Journal of Luminescence》 2005-03
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A Single White Phosphor Suitable for Near Ultraviolet Excitation Applied to New Generation White LED Lighting

SUN Xiao-yuan, ZHANG Jia-hua, ZHANG Xia, LIU Shen-xin, JIANG Da-peng , WANG Xiao-jun (Key Laboratory of Excited State Processes, Chinese Academy of Sciences, Changchun 130033, China)  
We report, for the first time, white light emissions of a single Sr_2MgSiO_5∶Eu~(2+) material. The emission spectrum consists of two bands, located at 470 and 570 nm , respectively. The two bands have different fluorescence lifetimes, being attributed to Eu~(2+) ions substituted by different Sr sites. White light is generated by mixing the two colors. The excitation spectra of the two bands are both distributed within UV range. A white LED has been fabricated employing the white phosphor and a near UV of 400 nm InGaN chip. As the forward-(bias current) is 20 mA, the color temperature is 5 664 K, the color coordinates(CIE) are x=0.33, y=0.34, the color rendering index(CRI) is 85% and the luminescent intensity is 8 100 cd/m~2. Experiments demonstrate that CIE and CRI of the white LED change slightly with the variation of forward-bias current, indicating that the phosphor presented in this work is a promising material for use in new generation white LED lighting.
【Fund】: 中国科学院百人计划;; 国家自然科学基金(90201010 50172047 50272065)资助项目
【CateGory Index】: TN104
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