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.

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.

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