Reduction of efficiency droop in InGaN-based UV light-emitting diodes with InAlGaN barrier

Ching Hsueh Chiu*, Po Min Tu, Jet Rung Chang, Wei Ting Chang, Hao-Chung Kuo, Chun Yen Chang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

In this study, we fabricated and compared the performance of LEDs of InGaN-based UV MQWs active region with ternary AlGaN and quaternary InAlGaN barrier layers. HRXRD and TEM measurements show the two barriers are consistent with the lattice, and smooth morphology of quaternary InAlGaN layer can be observed in AFM. The electroluminescence results indicate that the light performance of the InGaN-based UV LEDs can be enhanced effectively when the conventional LT AlGaN barrier layers are replaced by the InAlGaN barrier layers. Furthermore, simulation results show that InGaN-based UV LEDs with quaternary InAlGaN barrier exhibit higher radiative recombination rate about 62% and low efficiency droop about 13% at a high injection current. We attribute this change to a drastic improvement from increasing of carrier concentration and redistribution of carriers, because of reduction of scatterings due to better morphology in the transverse carrier transport through the InGaN/InAlGaN MQWs.

Original languageEnglish
Title of host publicationGallium Nitride Materials and Devices VII
DOIs
StatePublished - 16 Apr 2012
EventGallium Nitride Materials and Devices VII - San Francisco, CA, United States
Duration: 23 Jan 201226 Jan 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8262
ISSN (Print)0277-786X

Conference

ConferenceGallium Nitride Materials and Devices VII
CountryUnited States
CitySan Francisco, CA
Period23/01/1226/01/12

Keywords

  • efficiency droop
  • UV LEDs

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