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Title: Optimization of hydrothermal growth ZnO Nanorods for enhancement of light extraction from GaN blue LEDs
Authors: Soh, C.B.
Tay, C.B. 
Chua, S.J. 
Le, H.Q.
Ang, N.S.S.
Teng, J.H.
Keywords: A2. Hydrothermal crystal growth
A3. Metalorganic chemical vapor deposition
B2. Semiconducting II-VI materials
B3. Light emitting diodes
Issue Date: 15-May-2010
Citation: Soh, C.B., Tay, C.B., Chua, S.J., Le, H.Q., Ang, N.S.S., Teng, J.H. (2010-05-15). Optimization of hydrothermal growth ZnO Nanorods for enhancement of light extraction from GaN blue LEDs. Journal of Crystal Growth 312 (11) : 1848-1854. ScholarBank@NUS Repository.
Abstract: In this study, we report on the enhancement in the light extraction efficiency of GaN blue LEDs topped with ZnO nanorods. The ZnO nanorods were grown by a two-step hydrothermal synthesis with pre-coated ZnO nanoparticles under optimized condition to give the appropriate size and quality, giving an increase in the light output efficiency of 66%. This improvement is attributed to the optimal rod size and spacing with improved thermal dissipation as compared to light extraction from plain GaN surface. During the ZnO growth on the LEDs, 0.55 M of NH3 was added and the ZnO sample was later annealed at 475 °C in N2 ambient, to drive out interstitial oxygen atoms from the tetrahedral unstable site. As a result, a high ratio of UV to orange defect band emission was achieved. The two-step growth of ZnO nanorods on GaN LEDs was effective in generating array of ZnO nanorods which serve as reflector to enhance light extraction from LEDs. © 2010 Elsevier B.V. All rights reserved.
Source Title: Journal of Crystal Growth
ISSN: 00220248
DOI: 10.1016/j.jcrysgro.2010.02.041
Appears in Collections:Staff Publications

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