NDLI: Temperature effects on output characteristics of quantum dot white light emitting diode

Content Provider	Springer Nature Link
Author	Ranjbaran, Amin
Copyright Year	2012
Abstract	In this paper, we proposed quantum dot (QD) based structure for implementation of white light emitting diode (WLED) based on InGaN/GaN. The proposed structure included three layers of InGaN QD with box shapes and GaN barriers. By using of single band effective mass method and considering strain effect, piezoelectric and spontaneous polarizations internal fields, then solving Schrödinger and Poisson equations self consistently, we obtained electron and hole eigen energies and wave functions. By evaluating dipole moment matrix elements for interband transitions, the output intensity was calculated due to the interband transition between two energy levels with highest emission probability. We adjusted QDs dimensions and material compositions so that the output light can be close to the ideal white light in chromaticity diagrams. Finally, effects of temperature variations on output spectrum and chromaticity coordinates were studied. We demonstrated that temperature variations in the range of 100 to 400 K decrease output intensity, broaden output spectral profile and cause a red shift in three main colors spectrums. This temperature variation deviates (x, y) are coordinated in the chromaticity diagram, but the output color still remains close to white.
Starting Page	284
Ending Page	291
Page Count	8
File Format	PDF
ISSN	20952759
Journal	Frontiers of Optoelectronics
Volume Number	5
Issue Number	3
e-ISSN	16744594
Language	English
Publisher	SP Higher Education Press
Publisher Date	2012-07-28
Publisher Institution	Chinese Universities
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	quantum dot (QD) InGaN optical intensity spectrum white light emitting diode (WLED) chromaticity coordinate Physics Electrical Engineering Biomedical Engineering
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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