Efficiency droop in GaInN/GaN LEDs

Houqiang Fu, Yuji Zhao

Research output: Chapter in Book/Report/Conference proceedingChapter

20 Scopus citations


This chapter will discuss widely studied but still debated topic in GaInN/GaN light emitting diodes (LEDs): efficiency droop. Efficiency droop refers to the reduction of efficiency with increasing current (current droop) or temperature (thermal droop). Two of the most recognized mechanisms are proposed to explain the origin of the efficiency droop, that is, Auger recombination and carrier leakage. Experimental data and theoretical simulations are provided to support each mechanism. The efficiency droop in c-plane GaInN/GaN LEDs is exacerbated due to the polarization effect. To solve this issue, very low-droop blue GaInN/GaN LEDs have been realized on semipolar and nonpolar GaN substrates with reduced or eliminated polarization effects. A modified ABC model is developed to characterize the droop performance of both c-plane and nonpolar/semipolar GaInN/GaN LEDs.

Original languageEnglish (US)
Title of host publicationNitride Semiconductor Light-Emitting Diodes (LEDs)
Subtitle of host publicationMaterials, Technologies, and Applications: Second Edition
Number of pages27
ISBN (Electronic)9780081019436
ISBN (Print)9780081019429
StatePublished - Jan 1 2018


  • Auger recombination
  • Carrier leakage
  • Efficiency droop
  • Light emitting diodes
  • Nonpolar
  • Polarization
  • Semipolar
  • Thermal droop

ASJC Scopus subject areas

  • General Engineering
  • General Materials Science


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