Enhanced Heat Dissipation in Gallium Nitride-Based Light-Emitting Diodes by Piezo-phototronic Effect

Qi Guo, Ding Li, Qilin Hua, Keyu Ji, Wenhong Sun*, Weiguo Hu*, Zhong Lin Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

As a new generation of light sources, GaN-based light-emitting diodes (LEDs) have wide applications in lighting and display. Heat dissipation in LEDs is a fundamental issue that leads to a decrease in light output, a shortened lifespan, and the risk of catastrophic failure. Here, the temperature spatial distribution of the LEDs is revealed by using high-resolution infrared thermography, and the piezo-phototronic effect is proved to restrain efficaciously the temperature increment for the first time. We observe the temperature field and current density distribution of the LED array under external strain compensation. Specifically, the temperature rise caused by the self-heating effect is reduced by 47.62% under 0.1% external strain, which is attributed to the enhanced competitiveness of radiative recombination against nonradiative recombination due to the piezo-phototronic effect. This work not only deepens the understanding of the piezo-phototronic effect in LEDs but also provides a novel, easy-to-implement, and economical method to effectively enhance thermal management.

Original languageEnglish
Pages (from-to)4062-4070
Number of pages9
JournalNano Letters
Volume21
Issue number9
DOIs
Publication statusPublished - 12 May 2021
Externally publishedYes

Keywords

  • GaN-based LEDs
  • infrared thermography
  • piezo-phototronic effect
  • self-heating effect
  • thermal management

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Guo, Q., Li, D., Hua, Q., Ji, K., Sun, W., Hu, W., & Wang, Z. L. (2021). Enhanced Heat Dissipation in Gallium Nitride-Based Light-Emitting Diodes by Piezo-phototronic Effect. Nano Letters, 21(9), 4062-4070. https://doi.org/10.1021/acs.nanolett.1c00999