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

Ilya E. Titkov*, Sergey Yu Karpov, Amit Yadav, Denis Mamedov, Vera L. Zerova, Edik Rafailov

*Corresponding author for this work

Research output: Contribution to journalArticle

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.

Original languageEnglish
Article number1323
JournalMaterials
Volume10
Issue number11
Early online date18 Nov 2017
DOIs
Publication statusPublished - 18 Nov 2017

Bibliographical note

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).

Keywords

  • Active region non-uniformity
  • Extended defects
  • InGaNgreen LEDs
  • Internal quantum efficiency
  • Light extraction efficiency
  • Modeling
  • Temperature-dependent electroluminescence

Fingerprint Dive into the research topics of 'Efficiency of true-green light emitting diodes: Non-uniformity and temperature effects'. Together they form a unique fingerprint.

  • Cite this