Highly Stable and Efficient Light-Emitting Diodes Based on Orthorhombic γ-CsPbINanocrystals

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

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Author(s)

  • Jie Guo
  • Min Lu
  • Xiaoyu Zhang
  • Siqi Sun
  • Ce Han
  • Yu Zhang
  • Xuyong Yang
  • Stephen V. Kershaw
  • Weitao Zheng

Detail(s)

Original languageEnglish
Pages (from-to)9290-9301
Journal / PublicationACS Nano
Volume17
Issue number10
Online published1 May 2023
Publication statusPublished - 23 May 2023

Abstract

Orthorhombic γ-CsPbIpossesses the highest structural stability among the optically active (light-emissive) CsPbIperovskites. Here, we make use of a seed-assisted heteroepitaxial growth to fabricate seed/core/shell CaIx/γ-CsPbI3/CaInanocrystals. Ultrasmall CaInanoparticles serve as seeds to template the Pb-centered octahedral arrangement which enables the formation of the γ-CsPbIphase and at the same time inhibit lattice strain by blocking the force transfer that otherwise leads to an octahedral twist and so improve the structural stability of the resulting nanocrystals. An outer shell composed from the same material, CaI2, isolates the formed γ-CsPbInanocrystals from the environment, which also significantly improves their stability under ambient conditions. Optical and electrical studies indicate that the seed/core/shell CaIx/γ-CsPbI3/CaIstructure possesses a shallower set of trap states as compared to cubic α-CsPbInanocrystals. Light-emitting diodes utilizing these γ-CsPbInanocrystals show a record high external quantum efficiency of 25.3%, high brightness of over 13600 cd/m2, and an operational lifetime of ∼14 h before reaching 50% of their initial luminance. These devices can repeatedly be illuminated over 650 times at ∼500 cd/mwith no decline of brightness, which indicates their great commercial potential. © 2023 American Chemical Society.

Research Area(s)

  • orthorhombic γ-CsPbI3 phase, seed, core, shell nanostructure, light-emitting diode, CaI2 nanoparticles, stable light-emitting devices, SOLAR-CELLS, PEROVSKITE, STABILITY, CSPBL(3), CSPBX3, BR

Citation Format(s)

Highly Stable and Efficient Light-Emitting Diodes Based on Orthorhombic γ-CsPbINanocrystals. / Guo, Jie; Lu, Min; Zhang, Xiaoyu et al.
In: ACS Nano, Vol. 17, No. 10, 23.05.2023, p. 9290-9301.

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