InGaN基白光LED光谱特征和结温相关性研究

Dependence of InGaN-based white LEDs spectral characteristics on junction temperature

摘要: 以InGaN蓝光+荧光粉的白光LED为研究对象，在恒定环境温度下改变驱动电流，利用光谱仪测得不同LED结温下的光谱曲线。通过分析实验数据，得出光谱特征与该型LED结温的关系。结果表明：InGaN基白光LED蓝光和荧光的峰值波长与结温没有明显的线性关系；蓝光的光谱线宽以及荧光和蓝光峰值强度的比值与结温具有良好的线性关系。

Abstract: Junction temperatures and spectral characteristics of InGaN+YAG white LEDs were measured at various driving currents and a constant environmental temperature, and the spectral curve under different junction temperatures was obtained, which indicated the dependence of InGaN+YAG white LEDs spectral characteristics on junction temperature. The experiment results show that the line width of blue spectrum is dependent on junction temperature, while the one of phosphor spectrum exhibits a weak dependence; the peak wavelengths of blue and phosphor spectrum have no dependence on junction temperature, while the peak intensity ratio of phosphor to blue spectrum has a good linearity.