Advantages of Concave Quantum Barriers in AlGaN Deep Ultraviolet Light-Emitting Diodes

Barsha Jain, Mano Bala Sankar Muthu, Ravi Teja Velpula, Ngoc Thi Ai Nguyen, Hieu Pham Trung Nguyen

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Although AlGaN-based deep ultraviolet (UV) light-emitting diodes (LEDs) have been studied extensively, their quantum efficiency and optical output power still remain extremely low compared to the InGaN-based visible color LEDs. Electron leakage has been identified as one of the most possible reasons for the low internal quantum efficiency (IQE) in AlGaN based UV LEDs. The integration of a p-doped AlGaN electron blocking layer (EBL) or/and increasing the conduction band barrier heights with prompt utilization of higher Al composition quantum barriers (QBs) in the LED could mitigate the electron leakage problem to an extent, but not completely. In this context, we introduce a promising approach to alleviate the electron overflow without using EBL by utilizing graded concave QBs instead of conventional QBs in AlGaN UV LEDs. Overall, the carrier transportation, confinement capability and radiative recombination are significantly improved. As a result, the IQE, and output power of the proposed concave QB LED were enhanced by ~25.4% and ~25.6% compared to the conventional LED for emission at ~254 nm, under 60 mA injection current.

Original languageAmerican English
Title of host publicationGallium Nitride Materials and Devices XVIII
EditorsHiroshi Fujioka, Hadis Morkoc, Ulrich T. Schwarz
ISBN (Electronic)9781510659476
StatePublished - 2023
EventGallium Nitride Materials and Devices XVIII 2023 - San Francisco, United States
Duration: Jan 30 2023Feb 2 2023

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering


ConferenceGallium Nitride Materials and Devices XVIII 2023
Country/TerritoryUnited States
CitySan Francisco

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • AlGaN
  • concave
  • electron leakage
  • electron-blocking layer
  • light-emitting diodes


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