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为了进一步提高固态白光光源的光效,探寻激发源与光效的关系,文章以菲涅尔理论为基础,研究了蓝光LED和LD作为激发源时,光能利用率随入射角及偏振角的关系。LED为激发源时,其光能利用率最大为96%;线偏振态LD为激发源时,入射角度为布儒斯特角、偏振角度为0°时,其光能利用率可达100%。研究表明在荧光转换型白光中,线偏振特性的LD相较于非偏振态的LED具有更好的光能利用率。基于所得结论提出了一种适用于LD激发荧光粉获取白光的荧光粉模块,并用蒙特卡罗光线追迹法进行了仿真验证,模拟结果与理论值完全吻合。
In order to further improve the light efficiency of the solid-state white light source and explore the relationship between the excitation source and the light efficiency, the article studies the blue light LED and LD as the excitation source, based on the Fresnel theory, the light utilization efficiency with incident angle and polarization angle relationship. When the LED is the excitation source, the light energy utilization rate is up to 96%. When the linear polarization state LD is the excitation source, the incidence angle is Brewster’s angle, and the light energy utilization rate can reach 100% when the polarization angle is 0 °. . Studies have shown that in the fluorescence-converted white light, LDs with linear polarization have better light energy utilization than non-polarization LEDs. Based on the conclusions obtained, a phosphor module suitable for obtaining white light by LD excitation phosphor is proposed and verified by Monte Carlo ray tracing method. The simulation results are in good agreement with the theoretical values.