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Proceedings Paper

Optical and structural properties of dual wavelength InGaN/GaN multiple quantum well light emitting diodes
Author(s): Zhe Chuan Feng; Ting-Wei Kuo; C. Y. Wu; Hong-Ling Tsai; Jer-Ren Yang; Y. S. Huang; Ian T. Ferguson; Weijie Lu
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Paper Abstract

The optical and structural properties of Charge Asymmetric Resonance Tunneling (CART) structure InGaN/GaN multiquantum wells (MQWs) grown on sapphire by metalorganic chemical vapor deposition (MOCVD) have been investigated by optical measurements of temperature-dependent photoluminescence (PL), photoluminescence excitation (PLE) and time-resolved photoluminescence (TRPL), and high-resolution transmission electron microscopy (HRTEM). Two typical samples are studied, both consisting of six periods of CART InGaN wells with 3.3 nm thickness and with 8.5 nm thickness of GaN barrier, respectively, and two periods of InGaN wells with 2 nm thickness of 7 nm GaN barrier with different well growth-temperature of 797°C and 782°C, respectively. According to the PL measurement results, large values of activation energy are obtained. The decrease of well growth-temperature results higher In composition and also in the increase of composition fluctuation in the InGaN MQW region, showing the stronger carrier localization effect and large values of activation energy and Stokes' shift are obtained. The lifetime at the low-energy side of the InGaN peaks is longer for higher indium composition.

Paper Details

Date Published: 2 September 2008
PDF: 12 pages
Proc. SPIE 7058, Eighth International Conference on Solid State Lighting, 70580S (2 September 2008); doi: 10.1117/12.795255
Show Author Affiliations
Zhe Chuan Feng, National Taiwan Univ. (Taiwan)
Ting-Wei Kuo, National Taiwan Univ. (Taiwan)
C. Y. Wu, Uni-Light Technology Corp. (Taiwan)
Hong-Ling Tsai, National Taiwan Univ. (Taiwan)
Jer-Ren Yang, National Taiwan Univ. (Taiwan)
Y. S. Huang, National Taiwan Univ. of Science & Technology (Taiwan)
Ian T. Ferguson, Georgia Institute of Technology (United States)
Weijie Lu, Fisk Univ. (United States)

Published in SPIE Proceedings Vol. 7058:
Eighth International Conference on Solid State Lighting
Ian T. Ferguson; Tsunemasa Taguchi; Ian E. Ashdown; Seong-Ju Park, Editor(s)

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