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讨论了荧光粉浓度及驱动电流强度对白光LED特性的影响。采用软件模拟实验和实际封装测试相结合的研究方法进行分析研究。对荧光粉浓度变化对白光LED光通量和相关色温(CCT)的影响进行了三维光线追迹模拟,并且进行了实际的封装验证。另外对白光LED的节温和显色性也做了深入细致的研究。研究结果表明:CCT随着荧光粉浓度的增大而减小,光通量则先上升后下降。同时由荧光粉浓度和驱动电流强度变化所引起的节温升高会降低荧光粉的转换效率。对显色性而言,采用高浓度荧光粉封装的白光LED有相对低的显色指数;并且显色指数随着驱动电流强度的增加而升高,最终趋于稳定。
The effects of phosphor concentration and driving current intensity on the characteristics of white LEDs were discussed. The software simulation experiment and the actual packaging test are combined to research and analyze. The effect of the change of phosphor concentration on white LED luminous flux and correlated color temperature (CCT) was simulated by 3D ray tracing, and the actual package verification was carried out. In addition to the white LED’s warmth and color rendering done a thorough and meticulous research. The results show that the CCT decreases with the increase of phosphor concentration, while the luminous flux increases first and then decreases. At the same time by the phosphor concentration and drive current intensity caused by changes in temperature will reduce the phosphor conversion efficiency. For color rendering, the white LED encapsulated with high concentration phosphor has a relatively low color rendering index; and the color rendering index increases with the increase of the driving current intensity and finally tends to be stable.