Multi-active region AlGaN UV LEDs with transparent tunnel junctions

Agnes Maneesha Dominic Merwin Xavier, Arnob Ghosh, Sheikh Ifatur Rahman, Andrew Allerman, Darpan Verma, Roberto C. Myers, Shamsul Arafin, Siddharth Rajan

Research output: Contribution to journalLetterpeer-review

1 Scopus citations


In this work, we demonstrate two-junction UV LEDs enabled by transparent tunnel junctions. Low voltage-drop tunnel junctions were realized in Al0.3Ga0.7N layers through a combination of high doping and compositional grading. Capacitance and current-voltage measurements confirmed the operation of two junctions in series. The voltage drop of the two-junction LED was 2.1 times that of an equivalent single-junction LED, and the two-junction LED had higher external quantum efficiency (147%) than the single junction.

Original languageEnglish (US)
Article number082001
JournalApplied Physics Express
Issue number8
StatePublished - Aug 1 2023
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy


  • cascading LEDs
  • tunnel junctions
  • ultraviolet light-emitting diodes


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