新一代白光LED照明用一种适于近紫外光激发的单一白光荧光粉

新一代白光LED照明用一种适于近紫外光激发的单一白光荧光粉 A Single White Phosphor Suitable for Near Ultraviolet Excitation Applied to New Generation White LED Lighting 孙晓园 SUN Xiao-yuan first-author 张家骅 ZHANG Jia-hua 张霞 ZHANG Xia 刘慎薪 LIU Shen-xin 蒋大鹏 JIANG Da-peng 王笑军 WANG Xiao-jun 中国科学院, 激发态物理重点实验室, 吉林, 长春, 130033 中国科学院, 激发态物理重点实验室, 吉林, 长春, 130033 Key Laboratory of Excited State Processes, Chinese Academy of Sciences, Changchun 130033, China Key Laboratory of Excited State Processes, Chinese Academy of Sciences, Changchun 130033, China 首次报道单一Sr 2 MgSiO 5 :Eu 2+ 材料的白光发射性质。发射光谱由两个谱带组成,分别位于470,570nm处,并具有不同的荧光寿命,归结为处于不同格位上的二价铕离子的发射,它们混合成白光。这两个发射带所对应的激发光谱均分布在250～450nm的紫外区,利用该荧光粉和具有400nm近紫外光发射的InGaN管芯制成了白光LED。正向驱动电流为20mA时,色温为5664K;发光色坐标为 x =0.33, y =0.34;显色指数为85%;光强达8100cd/m 2 。实验表明,器件的色坐标和显色指数等参数随正向驱动电流的变化起伏量小于5%,优于目前商用的蓝光管芯泵浦白光LED,报道的单一白光荧光粉在新一代白光LED照明领域具有广阔的应用前景。 We report, for the first time, white light emissions of a single Sr 2 MgSiO 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 5664 K, the color coordinates(CIE) are x =0.33, y =0.34, the color rendering index(CRI) is 85% and the luminescent intensity is 8100 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. 白光LED 白光荧光粉 单一白光荧光粉 white LED white phosphor single white phosphors O482.31 中国科学院BR计划;国家自然科学基金(90201010,50172047,50272065)资助项目 2005-03-20 2005-04-19 2005-05-20 2020-08-11 3 26