Document Type


Original Publication Date


Journal/Book/Conference Title

Applied Physics Letters





DOI of Original Publication



Originally published at

K. S. Ramaiah was at a different university at the time of publication, but was later affiliated with VCU and was listed as the reprint author.

Date of Submission

April 2015


InGaN(3nm)∕GaN(5nm) three period multiquantum green-light-emitting diodes(LEDs) grown by the metalorganic chemical vapor deposition technique have been studied using high-resolution transmission electron microscopy (HRTEM), double crystal high resolution x-ray diffraction (HRXRD) and low temperature photoluminescence. HRTEM analysis showed that the defect density gradually decreased in the growth direction with increasing thickness. Self-assembled quantum dot-likestructures in the wells and black lumps between the well and barrier due to In segregation and strain contrast were observed, respectively. The HRXRD spectrum of the green LEDstructure was simulated using the kinematical theory method to obtain the composition and thickness of the well and barrier. The quantum-well (QW) green emission peak 2.557eV at 10K showed “S” shaped shift like a red–blue–red shift with variation of the temperature in the photoluminescence spectra due to potential fluctuations caused by inhomogeneous alloy distribution in the wells. The activation energy of 49meVobtained from the QW green emission line indicated deepening of the localization of the carriers.


Ramaiah, K.S., Su, Y.K., Chang, S.J., et al. Studies of InGaN∕GaN multiquantum-well green-light-emitting diodes grown by metalorganic chemical vapor deposition. Applied Physics Letters, 85, 401 (2004). Copyright © 2004 AIP Publishing LLC.

Is Part Of

VCU Electrical and Computer Engineering Publications