有机荧光材料DCJTB对白光LED发光特性的影响  

Influence of organic fluorescent material DCJTB on luminescent properties of white LED

作　　者：毕长栋[1] 张方辉[1] 孙立蓉[1] 马颖[1] 张麦丽[1] 

机构地区：[1]陕西科技大学电气与信息工程学院,陕西西安710021

出　　处：《光电子．激光》2011年第11期1660-1662,共3页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(61076066);陕西科技大学自然科学基金资助项目(ZX09-31);陕西科技大学科研启动基金资助项目(BJ09-07)

摘　　要：通过在YAG荧光粉中混合质量分数分别为1%、3%、5%、10%有机材料DCJTB的方法研究白光LED的激发光谱。结果表明,随着DCJTB混合浓度的增加,550～750nm波段的黄光、红光区域有明显的激发波峰,光谱色坐标明显从白光区域(0.2695,0.2435)向红光区域(0.447 9,0.272 9)移动,但绿光区域光谱峰值却逐渐下降,最后趋近于零,光谱呈现出两个相对独立的波峰。其中当混合浓度为1%时,LED的显色指数达到峰值74.2;但随着混合浓度的增加,显色指数明显下降。因此,LED芯片发出的能量能够激发有机材料DCJTB,同时DCJTB对YAG荧光粉发出的绿光区域有较强吸收。The excitation spectrum of white LED is studied in this paper. Here,the DCJTB was mixed into YAG phosphor by the proportions of 1 %,2%,5% and 10 %, respectively. With the mixing eoncentra tion increasing,we find that there are significant excitation peaks in the red and yellow regions （550 nm 4750 nm）. And spectral color coordinates move from white region （0. 269 5,0. 243 5） to red region （0. 447 9,0. 272 9）. However, the spectral peak in green region is nearly decreased to zero. So the spec trum shows two relatively independent peaks. The color-rendering index of LED reaches the maximum of 74. 2 when the mixing concentration is 1%. However,with the increase of mixing concentration,the color index decreases clearly. Therefore, the energy emitted from LED chip can stimulate DCJTB. Meanwhile, the DCJTB has a strong absorption in the green region excited by the YAG phosphor.

关 键 词：荧光粉 有机材料 发光特性 辐射光谱 

分 类 号：TN312.8[电子电信—物理电子学]