scholarly journals Both improvements of the light extraction efficiency and scattered angle of GaN-LED using sub-micron Fresnel lens array

2015 ◽  
Author(s):  
Xinyu Gu ◽  
Linsen Chen ◽  
Su Shen ◽  
Wenqiang Wan
Keyword(s):  
Extraction Efficiency ◽  
Fresnel Lens ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Lens Array ◽  
Gan Led

Effect of Structure of Nano-Hemisphere Microlens Array on Light Extraction Efficiency of GaN-LED

2012 ◽  
Vol 32 (12) ◽  
pp. 1223001
Author(s):  
王晓民 Wang Xiaomin ◽  
李康 Li Kang ◽  
孔凡敏 Kong Fanmin ◽  
张振明 Zhang Zhenming ◽  
高晖 Gao Hui
Keyword(s):  
Extraction Efficiency ◽  
Microlens Array ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Gan Led ◽  
Effect Of Structure

Enhancement of near-UV GaN LED light extraction efficiency by GaN/sapphire template patterning

2012 ◽  
Vol 27 (8) ◽  
pp. 082002 ◽  
Author(s):  
M Ali ◽  
O Svensk ◽  
L Riuttanen ◽  
M Kruse ◽  
S Suihkonen ◽  
...  
Keyword(s):  
Extraction Efficiency ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Led Light ◽  
Gan Led

Analytical Calculation of the Light Extraction Efficiency of Micro Cavities Light-Emitting Diodes

2007 ◽  
Vol 364-366 ◽  
pp. 98-103
Author(s):  
Paul C.P. Chao ◽  
Lun De Liao ◽  
Yi Hua Fan ◽  
Chien Yu Shen ◽  
Yung Yuan Kao ◽  
...  
Keyword(s):  
Extraction Efficiency ◽  
Substrate Surface ◽  
Surface Texturing ◽  
Three Dimensional ◽  
Analytical Calculation ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Light Emitting ◽  
Gan Led ◽  
Micro Cavity

Using TracePro® Monte-Carlo ray-tracing simulations, this paper investigates the improved light extraction efficiency (LEE) obtained by patterning the surface and/or substrate of GaN LEDs with unique three-dimensional micro-cavity patterns. The simulations commence by considering the case of a sapphire-based GaN LED. The effects on the LEE of the micro-cavity dimensions, the absorption coefficient of the active layer, the point source location, and the chip dimensions are systematically examined. Subsequently, the LEE performance of the sapphire-based GaN LED is compared with that of a thin-GaN LED for various surface texturing strategies. In general, the results show that patterning either the surface or the substrate of the LED structure provides an effective improvement in the LEE of both the sapphire-based GaN LED and the thin- GaN LED. For both LED structures, the maximum LEE enhancement is obtained by patterning both the upper surface of the LED and the substrate surface. However, the simulation results indicate that the improvement obtained in the LEE is the result primarily of pattering the upper surface of the LED.

scholarly journals Emission-intensity-enhanced GaN-based LED based on multilayer grating structures

2021 ◽  
Vol 51 (4) ◽  
Author(s):  
Xin Li ◽  
Dejie Sun ◽  
Kun Han ◽  
Lijun Cao ◽  
Shiliang Guo ◽  
...  
Keyword(s):  
Extraction Efficiency ◽  
Internal Quantum Efficiency ◽  
Waveguide Structure ◽  
Light Extraction ◽  
Light Extraction Efficiency ◽  
Emission Efficiency ◽  
Ito Film ◽  
Gan Led ◽  
Multilayer Grating ◽  
Symmetrical Waveguide

A novel surface-plasmon-enhanced GaN-LED is proposed to improve the emission efficiency of the traditional LED. The SiO2 film, Ag triangular structure and ITO film were coated on the rectangularly-patterned p-GaN layer sequentially, which can form the quasi-symmetrical waveguide structure to enhance the internal quantum efficiency and the light extraction efficiency. The COMSOL software is used to simulate the LED structure. The radiated powers, absorbed powers and distribution of electric field are obtained and analyzed. The results reveal that emission efficiency of the proposed GaN-LED can be greatly improved.

scholarly journals Enhancement of Light Extraction Efficiency for InGaN/GaN Light-Emitting Diodes Using Silver Nanoparticle Embedded ZnO Thin Films

Micromachines ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 239 ◽  
Author(s):  
Lei ◽  
Yang ◽  
Huang ◽  
Yeh
Keyword(s):  
Thin Film ◽  
Silver Nanoparticle ◽  
Surface Texture ◽  
Extraction Efficiency ◽  
Light Extraction ◽  
Window Layer ◽  
Light Extraction Efficiency ◽  
Zno Thin Film ◽  
Light Emitting ◽  
Gan Led

In this study, we propose a liquid-phase-deposited silver nanoparticle embedded ZnO (LPD-Ag NP/ZnO) thin film at room temperature to improve the light extraction efficiency (LEE) for InGaN/GaN light-emitting diodes (LEDs). The treatment solution for the deposition of the LPD-Ag/NP ZnO thin film comprised a ZnO-powder-saturated HCl and a silver nitrate (AgNO3) aqueous solution. The enhanced LEE of an InGaN/GaN LED with the LPD-Ag NP/ZnO window layer can be attributed to the surface texture and localized surface plasmon (LSP) coupling effect. The surface texture of the LPD-Ag/NP ZnO window layer relies on the AgNO3 concentration, which decides the root-mean-square (RMS) roughness of the thin film. The LSP resonance or extinction wavelength also depends on the concentration of AgNO3, which determines the Ag NP size and content of Ag atoms in the LPD-Ag NP/ZnO thin film. The AgNO3 concentration for the optimal LEE of an InGaN/GaN LED with an LPD-Ag NP/ZnO window layer occurs at 0.05 M, which demonstrates an increased light output intensity that is approximately 1.52 times that of a conventional InGaN/GaN LED under a 20-mA driving current.

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
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