离心沉降工艺对白光LED器件色区的影响

The Influence of Centrifugal Settling Process on the Color Area of White LED Device

在LED点胶工艺中,由于荧光粉受自身重力影响而引发沉降问题一直阻碍白光LED器件良率的提升,本文研究了荧光粉沉降对LED器件光电参数的影响,实验结果表明LED器件的光电参数会随着荧光粉沉降发生变化,但是沉淀时间达到8h以后,LED器件光电参数趋于稳定。基于此,本文研究采用离心沉降工艺来加速荧光粉的沉降速度,让荧光粉在短时间内加速沉降至LED芯片表面,有效解决荧光粉自身沉降引起的色漂移,改进白光LED器件色区分布,实现LED器件颜色集中度进一步提升的目标。

In the LED dispensing process, the settlement issue caused by phosphor’s own gravity has prevented the while LED device yield improvement.The effect of phosphor deposition to the photoelectric parameters of LED devices is studied. The experimental results show that LED photoelectric parameters will change with phosphor sedimentation. But when precipitation time reaches after 8h, the photoelectric parameters of LED devices tend to be stable. Based on this, this paper studies the centrifugal sedimentation process to accelerate the sedimentation rate of phosphor, which is to accelerate the deposition of phosphor to the surface of LED chip in a short time, so that to effectively solve the color drift caused by the precipitation of phosphor itself. It is to improve the color region distribution of white-light LED devices, and to achieve the goal of further enhancing the color concentration of LED devices.