Title: Brightness enhancement of ITO/GaN LEDs by self-aligned micro-net structures
Authors: Chang, KM
Chu, JY
Cheng, CC
Chu, CF
Department of Electronics Engineering and Institute of Electronics
Issue Date: 2005
Abstract: Arrays of square and hexagonal holes of various dimensions were patterned on indium-tin-oxide (ITO)/GaN light-emitting diodes (LEDs) using the self-aligned method to increase the light extraction area and shorten the optical paths. The hole region was etched to give the sidewall of the active layer a sloped profile, and it was passivated by SiOxNy films to extract more light. The self-aligned micro-net LED is at least 10% brighter than the conventional structure in the normal direction without loss of operating voltage or leakage current. The ratio of luminescence to total output power is increased by 25% at a current density of 100 A/cm(2). Moreover, varying the hole dimensions and the designed density increased the peak external quantum efficiency by 5% at a current of 3 mA. The greater axial luminescence and the higher external quantum efficiency make LEDs self-aligned micro-net structures quite useful in surface-mounting and low-power-consuming devices, such as cellular phones. (c) 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
URI: http://hdl.handle.net/11536/17619
ISSN: 1610-1634
DOI: 10.1002/pssc.200461550
Journal: Physica Status Solidi C - Conferences and Critical Reviews, Vol 2, No 7
Volume: 2
Issue: 7
Begin Page: 2920
End Page: 2923
Appears in Collections:Conferences Paper

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