远程荧光体白光发光二极管的发光性能

研究了高色温和低色温两种球冠状远程荧光粉白光LED在不同电流、不同热沉温度下的发光性能差异.结果表明：在大电流下，LED有源层内由于量子限制斯塔克效应使其峰值波长向短波方向移动，偏离了高色温荧光粉的最佳激发波长，更加接近低色温荧光粉的最佳激发波长.高色温LED的相关色温随电流增加呈上升趋势，低色温LED的相关色温随电流增加呈下降趋势，与它们的量子效率变化引起的色坐标漂移有很大关系.两种LED量子效率和发光效能随热沉温度的升高均呈略微增大的趋势；其中，高色温LED的量子效率和发光效能随电流的增大而减小，而低色温LED的量子效率和发光效能则随电流的增大而升高；高色温LED发光性质较低色温LED好，但色特性的稳定程度不如低色温LED.

Abstract

The luminous properties of sphere-like remote phosphor white LEDs with high Correlated Color Temperature(CCT) and low CCT were studied under different drive currents and heat sink temperatures. The result shown that the quantum efficiency and luminous efficacy of both LEDs raise with the increase of heat sink temperatures; the high-CCT LED’s quantum efficiency and luminous efficacy decrease with rising currents. However, the low-CCT LED shows a reverse trend. The reason is attributed to the quantum confinement stark effect in the active region, which makes the wavelength move towards short-wavelength so as to deviate from the optimum stimulation wavelength of the high-CCT phosphor, but close to the optimum stimulation wavelength of the low-CCT phosphor. The CCT of the high-CCT LED increase with rising currents, again, the low-CCT LED shows a reverse trend with rising currents. This trend is mainly related to the drifting of color coordinates caused by quantum efficiency changing. To sum up, the high-CCT LED possesses better optical properties but inferior color properties than the low-CCT LED.

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