材料科学
发光二极管
光学
光电子学
晶格常数
光子晶体
二极管
紫外线
衍射
布拉格定律
光子学
物理
作者
Zesen Liu,xinxin yu,Jianhong Zhang,Xinghua Liu,JIANDONG YE,F. Ren,Yiwang Wang,Weizong Xu,Dong Zhang,Rong Zhang,Yue Zheng,H. J. Lü
出处
期刊:Optics Letters
[The Optical Society]
日期:2023-01-02
卷期号:48 (2): 247-247
被引量:3
摘要
The authors demonstrate the enhanced light output from 275-nm AlGaN-based deep ultraviolet (DUV) light-emitting diode (LED) structures via the in-plane modulation of shallow photonic crystal (PC) patterns that were fabricated on the p-AlGaN contact layer surface. The employed PC lattice constants are in the range of 270-780 nm, much larger than the fundamental Bragg order lattice constant (∼95 nm). As compared to the unpatterned sample, the intensity of the top (or bottom) emission can be enhanced by up to 331% (or 246%), attributed to the high-order coherent diffraction of the internal trapped light and also the Purcell enhancement of spontaneous emission. The findings in this Letter suggest an easier way for the realization of more energy-efficient DUV LEDs which offer the advantage of high emission for various applications in disinfection and sterilization.
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