Temperature-dependent internal quantum efficiency of blue high-brightness light-emitting diodes

Abstract

Internal quantum efficiency (IQE) of a blue high-brightness InGaN/GaN light-emitting diode (LED) was evaluated from the external quantum efficiency measured as a function of current at various temperatures ranged between 13 and 440 K. Processing the data with a novel evaluation procedure based on the ABC-model, we have determined the temperature-dependent IQE of the LED structure and light extraction efficiency of the LED chip. Separate evaluation of these parameters is helpful for further optimization of the heterostructure and chip designs. The data obtained enable making a guess on the temperature dependence of the radiative and Auger recombination coefficients, which may be important for identification of dominant mechanisms responsible for the efficiency droop in III-nitride LEDs. Thermal degradation of the LED performance in terms of the emission efficiency is also considered.

Publication DOI: https://doi.org/10.1109/JQE.2014.2359958
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
College of Engineering & Physical Sciences > School of Informatics and Digital Engineering > Electrical and Electronic Engineering
Additional Information: © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Funding: European Union through the Nanostructured Efficient White LEDs Project within the FP7 Programme under Grant 318388
Uncontrolled Keywords: auger recombination,iII-nitrides,internal quantum efficiency,light-emitting diodes,optical emission spectra,temperature dependence,Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Condensed Matter Physics
Full Text Link: http://ieeexplo ... rnumber=6910236
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2014-11
Published Online Date: 2014-09-25
Authors: Titkov, Ilya E.
Karpov, Sergey Yu
Yadav, Amit
Zerova, Vera L.
Zulonas, Modestas
Galler, Bastian
Strassburg, Martin
Pietzonka, Ines
Lugauer, Hans Juergen
Rafailov, Edik U. (ORCID Profile 0000-0002-4152-0120)

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