传统白光LED与远程荧光粉白光LED的发光性能比较

研究了传统白光LED与蓝光激发的球冠形远程荧光粉白光LED在不同电流、不同热沉温度下的发光性能，并对其机理差异展开了探讨。实验结果表明：随热沉温度和驱动电流的上升，传统白光LED的量子效率和电光转换效率急剧下降，并导致其Y/B比（Yellow/Blue Ratio）下降，相关色温上升。而在远程荧光粉白光LED中，其量子效率、光转换效率和相关色温在相同实验条件下变化幅度都较小。由光强空间分布和Y/B比空间分布可知，远程荧光粉白光LED的光强分布呈类似蝠翼分布，且Y/B比空间均匀性远大于传统白光LED。

The Difference of Luminous Performance Between Traditional Phosphor Packaging LED and Remote Phosphor LED

Under different drive current and heat sink temperature, luminous performances as well as physical mechanisms were studied for both traditional phosphor-dispensing packaging white LED and blue light-converting hemisphere remote phosphor LEDs. With the increase of the heat sink temperature and the drive currents, the quantum efficiency and light conversion efficiency in the traditional phosphor-dispensing packaging white LED drop rapidly, which is responsible for the decrease of Y/B ratio (Yellow/Blue Ratio) and the apparent increase of CCT (correlated color temperature). However, the parameters of quantum efficiency, light conversion efficiency and CCT in blue light-converting hemisphere remote-phosphor packaging LEDs have little change under the same experimental conditions. In addition, the remote phosphor LEDs exhibit a batwing spatial luminous intensity distribution and the spatial Y/B ratio distribution is much more homogeneous compared with the traditional phosphor-dispensing packaging white LED.