Kuo Hao-Chung, Hung Cheng-Wei, Chen Hsin-Chu, Chen Kuo-Ju, Wang Chao-Hsun, Sher Chin-Wei, Yeh Chia-Chi, Lin Chien-Chung, Chen Cheng-Huan, Cheng Yuh-Jen
Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, China.
Opt Express. 2011 Jul 4;19 Suppl 4:A930-6. doi: 10.1364/OE.19.00A930.
High efficiency white light-emitting diodes with superior color-mixing have been investigated. It is suggested that the patterned remote phosphor structure could improve the uniformity of angular-dependent correlated color temperature (CCT) and achieve high chromatic stability in wider operating current range, as compared to the conventional remote phosphor coating structure. In this experiment, we employed a pulse spray coating method to place the patterned phosphor on the package and to leave a window region. The window area, a clear space without coating of the phosphor not only increases the extraction efficiency of blue rays at large angle, but also improves the stability of angular-dependent CCT. Moreover, the CCT deviation could be reduced from 1320 K to 266 K by this patterned remote phosphor method, and the stray blue/yellow light within the package can be effectively reduced and controlled. The design was verified both experimentally and theoretically.
已对具有卓越混色性能的高效白光发光二极管进行了研究。结果表明，与传统的远程荧光粉涂层结构相比，图案化远程荧光粉结构可提高角度相关相关色温（CCT）的均匀性，并在更宽的工作电流范围内实现高色度稳定性。在本实验中，我们采用脉冲喷涂法将图案化荧光粉放置在封装上并留出一个窗口区域。窗口区域，即没有荧光粉涂层的清晰空间，不仅提高了大角度蓝光的提取效率，还提高了角度相关CCT的稳定性。此外，通过这种图案化远程荧光粉方法，CCT偏差可从1320 K降低到266 K，并且封装内的杂散蓝/黄光可得到有效减少和控制。该设计通过实验和理论得到了验证。
