scholarly journals Asymmetrical Interfaces Design for Unidirectional Light Extraction from Spectrum Conversion Films

2022 ◽  
Author(s):  
Lihua Shen ◽  
runnan lou ◽  
Xiaobo Yin
Keyword(s):  
Light Extraction ◽  
Spectrum Conversion

ZnO Nano-arrays on High Power Blue LED Chip for Enhanced Light Extraction Efficiency

2012 ◽  
Vol 27 (7) ◽  
pp. 716-720
Author(s):  
Bing XU ◽  
Jun-Liang ZHAO ◽  
Jian-Ming ZHANG ◽  
Xiao-Wei SUN ◽  
Fu-Wei ZHUGE ◽  
...  
Keyword(s):  
High Power ◽  
Extraction Efficiency ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Blue Led

Ultrathin microcrystalline hydrogenated Si/Ge alloyed tandem solar cells towards full solar spectrum conversion

2020 ◽  
Vol 14 (6) ◽  
pp. 997-1005 ◽  
Author(s):  
Yu Cao ◽  
Xinyun Zhu ◽  
Xingyu Tong ◽  
Jing Zhou ◽  
Jian Ni ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Spectrum ◽  
Tandem Solar Cells ◽  
Spectrum Conversion

scholarly journals Perspectives on UVC LED: Its Progress and Application

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 196
Author(s):  
Tsung-Chi Hsu ◽  
Yu-Tsai Teng ◽  
Yen-Wei Yeh ◽  
Xiaotong Fan ◽  
Kuo-Hsiung Chu ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Flip Chip ◽  
Layer Structure ◽  
Light Emitting Diode ◽  
Internal Quantum Efficiency ◽  
Reverse Current ◽  
Light Extraction ◽  
Epitaxial Layers ◽  
High Electron ◽  
Recombination Rates

High-quality epitaxial layers are directly related to internal quantum efficiency. The methods used to design such epitaxial layers are reviewed in this article. The ultraviolet C (UVC) light-emitting diode (LED) epitaxial layer structure exhibits electron leakage; therefore, many research groups have proposed the design of blocking layers and carrier transportation to generate high electron–hole recombination rates. This also aids in increasing the internal quantum efficiency. The cap layer, p-GaN, exhibits high absorption in deep UV radiation; thus, a small thickness is usually chosen. Flip chip design is more popular for such devices in the UV band, and the main factors for consideration are light extraction and heat transportation. However, the choice of encapsulation materials is important, because unsuitable encapsulation materials will be degraded by ultraviolet light irradiation. A suitable package design can account for light extraction and heat transportation. Finally, an atomic layer deposition Al2O3 film has been proposed as a mesa passivation layer. It can provide a low reverse current leakage. Moreover, it can help increase the quantum efficiency, enhance the moisture resistance, and improve reliability. UVC LED applications can be used in sterilization, water purification, air purification, and medical and military fields.

Nano-grooves etching on top of GaN-LED for light extraction enhancement

2021 ◽  
Vol 138 ◽  
pp. 106842
Author(s):  
Qifa Liu ◽  
Zhenhai Wang ◽  
Lihui Zhu ◽  
Xiefeng Cheng ◽  
Jin Wang
Keyword(s):  
Light Extraction ◽  
Gan Led
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