三芯片集成高显色指数白光LED的研究

运用基于蒙特卡罗的光线追迹方法,对采用"光转换"兼"多色混合"技术的白光LED的显色指数、相关色温、光通量、光辐射功率、荧光粉颗粒密度和色坐标进行了仿真计算和优化选择。通过改变红、绿、蓝三种LED芯片的组合方式和红、绿、黄三种荧光粉的混合方式及各色荧光粉的密度,在保证有合理的光通量输出的条件下,得到了不同色温区的高显色指数白光LED。从显色指数角度看,冷白、正白和暖白光应分别选择BBB芯片+绿、红色荧光粉、BBB芯片+黄、红色荧光粉和RBB芯片+黄色荧光粉组合。实验上测试了采用这几种组合方式的白光LED光谱、显色指数、色温、光通量和色坐标,实验数据与仿真结果基本吻合。

Study on High CRI White LED Integrated with Three chips

Based on Monte Carlo ray-tracing method,"light-conversion" and "multicolor mixing" technologies were applied to make simulations and optimizations on the parameters including color rendering index(CRI),correlated color temperature(CCT),flux,radiation power and phosphor particle density of white LEDs.By adjusting the set of three LED chips(red,green and blue),the mixing way of the different phosphors(red,green,and yellow) and the density of the phosphors,a high CRI white light LED under different CCT was obtained under the condition that the amount of light output is acceptable.It comes to a conclusion that BBB chip + green/red phosphors,BBB chip + yellow/red phosphors and RBB chip + yellow phosphor are respectively for cool,neutral and warm correlated color temperature.Then the feasibility is confirmed by experiments.