Efficiency of true-green light emitting diodes:Non-uniformity and temperature effects

Abstract

External quantum efficiency of industrial-grade green InGaN light-emitting diodes (LEDs) has been measured in a wide range of operating currents at various temperatures from 13 K to 300 K. Unlike blue LEDs, the efficiency as a function of current is found to have a multi-peak character, which could not be fitted by a simple ABC-model. This observation correlated with splitting of LED emission spectra into two peaks at certain currents. The characterization data are interpreted in terms of non-uniformity of the LED active region, which is tentatively attributed to extended defects like V-pits. We suggest a new approach to evaluation of temperature-dependent light extraction and internal quantum efficiencies taking into account the active region non-uniformity. As a result, the temperature dependence of light extraction and internal quantum efficiencies have been evaluated in the temperature range mentioned above and compared with those of blue LEDs.

Publication DOI: https://doi.org/10.3390/ma10111323
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
Uncontrolled Keywords: Active region non-uniformity,Extended defects,InGaNgreen LEDs,Internal quantum efficiency,Light extraction efficiency,Modeling,Temperature-dependent electroluminescence,Materials Science(all)
Publication ISSN: 1996-1944
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.mdp ... 1944/10/11/1323 (Publisher URL)
PURE Output Type: Article
Published Date: 2017-11-18
Published Online Date: 2017-11-18
Accepted Date: 2017-09-12
Submitted Date: 2017-08-17
Authors: Titkov, Ilya E.
Karpov, Sergey Yu
Yadav, Amit
Mamedov, Denis
Zerova, Vera L.
Rafailov, Edik (ORCID Profile 0000-0002-4152-0120)

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