Title :
Double-sided pattern design on patterned sapphire substrate of GaN-based LEDs
Author :
Xinyu Yu ; Zhen Che ; Jun Zhang ; Mengyuan Xie ; Jianhui Yu ; Huihui Lu ; Yunhan Luo ; Zhe Chen
Author_Institution :
Dept. of Optoelectron. Eng., Jinan Univ., Guangzhou, China
Abstract :
In this paper, we established a optical model and made an analysis of GaN-based LED flip chip by double-sided PSS (patterned sapphire substrate). The result analysis shows that the small distance and large radius of micro-cylinder and micro-hemisphere for cylindrical and hemispherical PSS would be more effective to enhance LED efficacy. The hemispherical pattern is more efficient than the cylindrical for enhancement for the light extraction efficiency (LEE) of PSS-LED flip chip. The light extraction efficiency of micro-hemispherical PSS-LED chip is twice than that on the non-patterned (or normal planar) sapphire substrate (non-PSS).
Keywords :
III-V semiconductors; flip-chip devices; gallium compounds; light emitting diodes; wide band gap semiconductors; Al2O3; GaN; GaN-based LED flip chip; cylindrical PSS; double-sided PSS; double-sided pattern design; hemispherical pattern; light extraction efficiency; microcylinder; microhemisphere; microhemispherical PSS-LED chip; optical model; patterned sapphire substrate; Flip-chip devices; Light emitting diodes; Optical device fabrication; Optical reflection; Optical refraction; Optical variables control; Substrates; double-sided pattern; light extraction efficiency; patterned sapphire substrate;
Conference_Titel :
Numerical Simulation of Optoelectronic Devices (NUSOD), 2014 14th International Conference on
Conference_Location :
Palma de Mallorca
Print_ISBN :
978-1-4799-3681-6
DOI :
10.1109/NUSOD.2014.6935338
