Perovskite-Gallium Nitride Tandem Light-Emitting Diodes with Improved Luminance and Color Tunability

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

22 Scopus Citations
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Author(s)

  • Zong-Tao Li
  • Hong-Wei Zhang
  • Jia-Sheng Li
  • Kai Cao
  • Ziming Chen
  • Liang Xu
  • Xin-Rui Ding
  • Bin-Hai Yu
  • Yong Tang
  • Jian-Zhen Ou
  • Hao-Chung Kuo

Detail(s)

Original languageEnglish
Article number2201844
Journal / PublicationAdvanced Science
Volume9
Issue number22
Online published21 May 2022
Publication statusPublished - 5 Aug 2022

Link(s)

Abstract

Tandem structures with different subpixels are promising for perovskite-based multicolor electroluminescence (EL) devices in ultra-high-resolution full-color displays; however, realizing excellent luminance- and color-independent tunability considering the low brightness and stability of blue perovskite light-emitting diodes (PeLEDs) remains a challenge. Herein, a bright and stable blue gallium nitride (GaN) LED is utilized for vertical integration with a green MAPbBr3 PeLED, successfully achieving a Pe-GaN tandem LED with independently tunable luminance and color. The electronic and photonic co-excitation (EPCE) effect is found to suppress the radiative recombination and current injection of PeLEDs, leading to degraded luminance and current efficiency under direct current modulation. Accordingly, the pulse-width modulation is introduced to the tandem device with a negligible EPCE effect, and the average hybrid current efficiency is significantly improved by 139.5%, finally achieving a record tunable luminance (average tuning range of 16631 cd m-2 at an arbitrary color from blue to green) for perovskite-based multi-color LEDs. The reported excellent independent tunability can be the starting point for perovskite-based multicolor EL devices, enabling the combination with matured semiconductor technologies to facilitate their commercialization in advanced display applications with ultra-high resolution.

Research Area(s)

  • gallium nitride light-emitting diodes, luminance and color tunability, perovskite light-emitting diodes, tandem structure, NANOCRYSTALS

Citation Format(s)

Perovskite-Gallium Nitride Tandem Light-Emitting Diodes with Improved Luminance and Color Tunability. / Li, Zong-Tao; Zhang, Hong-Wei; Li, Jia-Sheng et al.
In: Advanced Science, Vol. 9, No. 22, 2201844, 05.08.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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