Sun Ching-Cherng, Chung Shuang-Chao, Yang Shuang-Hao, Yu Yeh-Wei, Chien Wei-Ting, Chen Huang-Kuen, Chen Shih-Peng
Department of Optics and Photonics, National Central University, Chung-Li 320, Taiwan.
Opt Express. 2013 Jul 29;21(15):18414-23. doi: 10.1364/OE.21.018414.
This paper demonstrates a novel retro-reflective dome that enhances the directionality of a light emitting diode (LED) by recycling photons reflected by a textured LED die surface. A simulation model is developed to describe both the photon recycling process within the dome and the role of specific pyramid patterns on the top surface of the LED die. Advanced simulations showed that a perfectly polished surface with 100% reflectivity potentially enhances the directionality of the dome by 340%, 250%, and 240% using reflective domes with 10°, 20°, and 30° light cones, respectively. In the experiment, the directionality of the domes exhibiting surface imperfections is enhanced by approximately 160%, 150%, and 130% using 10°, 20°, and 30° light cones, respectively. By incorporating a textured top surface on the LED die, the proposed dome effectively increases the directionality of the LED light source.
本文展示了一种新型的反光圆顶，它通过回收由有纹理的发光二极管（LED）芯片表面反射的光子来增强发光二极管的方向性。开发了一个模拟模型来描述圆顶内的光子回收过程以及LED芯片顶面上特定金字塔图案的作用。先进的模拟表明，使用10°、20°和30°光锥的反光圆顶时，具有100%反射率的完美抛光表面可能会使圆顶的方向性分别提高340%、250%和240%。在实验中，使用10°、20°和30°光锥时，存在表面缺陷的圆顶的方向性分别提高了约160%、150%和130%。通过在LED芯片上加入有纹理的顶面，所提出的圆顶有效地增加了LED光源的方向性。
