| Li Zhi-quan,Wang Ya-nan,Li Wen-chao,Cao Ping,Zhang Jing-ru.Extraction efficiency enhancement of LEDs using 2-D photonic crystal[J].Optoelectronics Letters,2012,8(3):186-189 |
| Extraction efficiency enhancement of LEDs using 2-D photonic crystal |
| Author Name | Affiliation | | Li Zhi-quan | Institute of Electric and Engineering, Yanshan University, Qinhuangdao 066004, China | | Wang Ya-nan | Institute of Electric and Engineering, Yanshan University, Qinhuangdao 066004, China | | Li Wen-chao | Department of Automation, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China | | Cao Ping | Department of Automation, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China | | Zhang Jing-ru | Department of Automation, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China |
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| Abstract: |
| Using photonic crystals (PCs), the extraction efficiency of the light-emitting diodes (LEDs) can be greatly enhanced by the
effects of photonic band gap (PBG) and grating diffraction. The two theoretical methods are also discussed. Meanwhile, we
demonstrate that LEDs can achieve high extraction efficiency by employing photonic crystal as diffraction grating. PCs with
square lattice of cylindrical unit cells are fabricated in GaN layer of GaN-based blue LED. We present a theoretical discussion
on the extraction efficiency of PC-LED, which relies on the effective medium theory and transmission matrix method to investigate
the effect of lattice constant. The results show that the extraction efficiency of the high performance LEDs can achieve 61.8%
when the lattice constant is 270 nm. |
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| This work has been supported by the National Natural Science Foundation of China (No.60877047) and the Natural Science Foundation of Hebei
Province (No.2010002002). |
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