Angular color uniformity enhancement of white light-emitting diodes by remote micro-patterned phosphor film
Angular color uniformity enhancement of white light-emitting diodes by remote micro-patterned phosphor film
复制标题
通过远程微图案荧光膜增强白光发光二极管的角度颜色均匀性
DOI：
10.1364/prj.4.000140
复制
发表时间：
2016-08-01
影响因子：
7.6
通讯作者：
Chen, Kaihang
中科院分区：
文献类型：
--
作者：
Yu, Shudong;Li, Zongtao;Chen, Kaihang
角度颜色均匀性（ACU）是评价白光LED发光质量的一个重要指标。在这项研究中，一种新型的双远程微图案化的荧光膜（双RMPP膜）被用来提高远程荧光（RP）筒灯的ACU。还检查常规RP膜和具有单个微图案化膜（单个RMPP膜）的远程磷光体膜以进行比较。实验测量了薄膜的角相关色温（CCT）分布和光学性能。测量结果表明，双RMPP膜结构具有更好的颜色均匀性，CCT偏差仅为441 K，而单RMPP膜结构的CCT偏差为556 K，RP膜结构的CCT偏差为1390 K。基于FDTD和射线追踪相结合的方法进行的仿真也证实了ACU的改善。此外，与传统的RP膜相比，单和双RMPP膜配置的发光效率分别提高了6.68%和4.69%，在350 mA的驱动电流。微图案化薄膜的散射和混合效应是提高ACU和发光效率的主要原因。此外，双RMPP膜结构具有更好的CCT稳定性在不同的电流比其他两种配置。结果表明，双RMPP膜在白色LED应用中的有效性和优越性。
Angular color uniformity (ACU) is a key factor used to evaluate the light quality of white-light emitting diodes (LEDs). In this study, a novel double remote micro-patterned phosphor film (double RMPP film) was used to enhance the ACU of a remote phosphor (RP) down-light lamp. A conventional RP film and remote phosphor film with single micro-patterned film (single RMPP film) also were examined for comparison. The angular correlated color temperature (CCT) distributions and the optical performance of the films were experimentally measured. The measurement results showed that double RMPP film configuration exhibited better color uniformity with a CCT deviation of only 441 K, compared with 556 K for the single RMPP film configuration and 1390 K for the RP film configuration. A simulation based on FDTD and ray tracing combined method also confirmed the ACU improvement. In addition, compared with the conventional RP film, the luminous efficiency of single and double RMPP film configurations was increased by 6.68% and 4.69%, respectively, at a driving current of 350 mA. The enhancement of the ACU and luminous efficiency are due to the scattering and mixing effect of the micro-patterned film. Moreover, the double RMPP film configuration had better CCT stability at different currents than the other two configurations. The results demonstrated the effectiveness and superiority of double RMPP film in white LED applications.