Open AccessElectrical determination of current injection and internal quantum efficiencies in AlGaN-based deep-ultraviolet light-emitting diodes
Author(s) -
Guo-Dong Hao,
Naoki Tamari,
Toshiyuki Obata,
Toru Kinoshita,
Shinichiro Inoue
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.00a639
Subject(s) - light emitting diode , electroluminescence , quantum efficiency , materials science , diode , optoelectronics , current density , ultraviolet , current (fluid) , optics , physics , layer (electronics) , quantum mechanics , composite material , thermodynamics
We propose a method to determine the current injection efficiency (CIE) and internal quantum efficiency (IQE) of light-emitting diodes (LEDs) during current injection. The method is based on fourth-order polynomial fitting of a modified rate equation to electroluminescence data. Our method can extract the CIE at low injection current densities, unlike conventional methods that generally assume the CIE to be unity. We apply the method to AlGaN-based deep-ultraviolet LEDs. Results show that the CIE was only approximately 51% at low injection current densities and was almost independent of injection current density up to 100 A/cm 2 . The peak IQE was 77%.