新型白光LED的光谱特性和相关结温特性

利用蓝光LED芯片激发Ru(dtb-bpy)₃]²⁺(PF₆^-)₂和YAG混合荧光粉的方法制备了新型白光LED,研究了随着Ru(dtb-bpy)₃]²⁺(PF₆^-)₂含量的增加而引起的白光LED光谱特性的变化。当Ru(dtb-bpy)₃]²⁺(PF₆^-)₂的质量分数为1.5%时,白光LED的显色指数达到83.2,效率相对于其含量为0%时下降了约20%。另外,研究了结温对于一体化封装的该新型白光LED发光特性的影响,结果表明:高显色LED的结温从30 ℃上升到130 ℃的过程中,芯片的蓝光辐射出现了较大幅度的减少,共降低了27.73%,随之也导致该白光LED总发光强度的衰减,而且其发光效率出现了大幅度的下降,共衰减了31.76%,但是其显色性没有明显的变化。

The Spectral and Junction Temperature Properties of New White Light LED

A new white LED was fabricated by irradiated the mixed fluorescent powder which contained Ru(dtb-bpy)3]2+(PF-6)2 and YAG.The relationship between white LED’ spectral and the Ru(dtb-bpy)3]2+(PF-6)2 content were investigated.When the mass fraction of Ru(dtb-bpy)3]2+(PF-6)2 was 1.5%,the White LED color-rending index reached 83.2 and its luminous efficiency was about 20% lower than those without Ru(dtb-bpy)3]2+(PF-6)2.Moreover,we studied the influence of junction temperature on the luminous properties of the integration package white LED.The results showed that the blue chip radiation reduced about 27.73% during LED’s junction temperature rising from 30 ℃ to 130 ℃.The white LED light intensity decreased and the luminous efficiency reduced 31.76%,while the color-rending was stability.