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Optical and Thermal Analyses of Thin-Film Hexagonal Micro-Mesh Light-Emitting Diodes

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4 Author(s)
Kwai Hei Li ; Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong ; Yuk Fai Cheung ; Qian Zhang ; Hoi Wai Choi

Vertical thin-film light-emitting diodes (LEDs) with integrated micro-mesh arrays are reported. By removing the sapphire substrate through laser lift-off, vertical current conduction becomes possible, improving current spreading capability and thus electrical properties. Compared with the as-grown device, the thin-film micro-mesh LEDs emits 61% more optical power, attributed to enhanced light extraction through the micro-mesh, evidence of which is provided by confocal imaging. At 100 mA, the enhancement factor rises to >;100% attributed to low junction temperatures due to efficient heat conduction as verified by infrared thermometric imaging.

Published in:

IEEE Photonics Technology Letters  (Volume:25 ,  Issue: 4 )