Bright CsPbI3 Perovskite Quantum Dot Light-Emitting Diodes with Top-Emitting Structure and a Low Efficiency Roll-Off Realized by Applying Zirconium Acetylacetonate Surface Modification

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

5 Scopus Citations
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Author(s)

  • Min Lu
  • Jie Guo
  • Siqi Sun
  • Po Lu
  • Jinlei Wu
  • Yu Wang
  • Stephen V. Kershaw
  • William W. Yu
  • Yu Zhang

Detail(s)

Original languageEnglish
Pages (from-to)2829–2836
Journal / PublicationNano Letters
Volume20
Issue number4
Online published30 Mar 2020
Publication statusPublished - 8 Apr 2020

Abstract

Zirconium acetylacetonate used as a co-precursor in the synthesis of CsPbI3 quantum dots (QDs) increased their photoluminescence quantum efficiency to values over 90%. The top-emitting device structure on a Si substrate with high thermal conductivity (to better dissipate Joule heat generated at high current density) was designed to improve the light extraction efficiency making use of a strong microcavity resonance between the bottom and top electrodes. As a result of these improvements, light-emitting diodes (LEDs) utilizing Zr-modified CsPbI3 QDs with an electroluminescence at 686 nm showed external quantum efficiency (EQE) of 13.7% at a current density of 108 mA cm-2, which was combined with low efficiency roll-off (maintaining an EQE of 12.5% at a high current density of 500 mA cm-2) and a high luminance of 14725 cd m-2, and the stability of the devices being repeatedly lit (cycled on and off at high drive current density) has been greatly enhanced.

Research Area(s)

  • CsPbI3 perovskite quantum dots, efficiency roll-off, surface modification, top-emitting light-emitting diodes, zirconium acetylacetonate

Citation Format(s)

Bright CsPbI3 Perovskite Quantum Dot Light-Emitting Diodes with Top-Emitting Structure and a Low Efficiency Roll-Off Realized by Applying Zirconium Acetylacetonate Surface Modification. / Lu, Min; Guo, Jie; Sun, Siqi; Lu, Po; Wu, Jinlei; Wang, Yu; Kershaw, Stephen V.; Yu, William W.; Rogach, Andrey L.; Zhang, Yu.

In: Nano Letters, Vol. 20, No. 4, 08.04.2020, p. 2829–2836.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal