Color-Stable Deep-Blue Perovskite Light-Emitting Diodes Based on Organotrichlorosilane Post-Treatment

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

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Author(s)

  • Guangruixing Zou
  • Zhenchao Li
  • Ziming Chen
  • Linghao Chu
  • Yong Cao

Detail(s)

Original languageEnglish
Article number2103219
Journal / PublicationAdvanced Functional Materials
Volume31
Issue number46
Online published8 Aug 2021
Publication statusPublished - Nov 2021

Abstract

Recent studies of sky-blue perovskite light-emitting diodes (PeLEDs) have extensively promoted optimal device design to achieve an external quantum efficiency (EQE) above 12%. However, the development of thin-film deep-blue PeLEDs lags dramatically behind, especially with regards to meeting the latest Rec. 2020 standard. A trichloro(3,3,3-trifluoropropyl) silane post-treatment that drives the emission of perovskite into the deep-blue region, ranging from 440 to 460 nm, which meets the Rec. 2020 standard, is proposed. The chlorine ions released from the organotrichlorosilane molecules during their polycondensation reaction provide an addition halide source to fine tune the composition of the mixed halide perovskite films, leading to increase of bandgap and deep-blue emission. In addition, hydrogen bonds between the hydroxy groups of silane molecules and halide anions in perovskite can suppress ion migration for improving emission stability. As a result, an optimal PeLED is developed with deep-blue emission at 458 nm and excellent color stability, which yields an EQE and luminance of 1.1% and 130 cd m−2, respectively, representing a state-of-the-art result for thin-film PeLEDs in this emission region. This work paves the way to achieve high-performance deep-blue PeLEDs with stable emissions to meet the demand for potential applications such as full-color display.

Research Area(s)

  • color stability, deep-blue, perovskite light-emitting diodes, stable emission spectrum

Citation Format(s)

Color-Stable Deep-Blue Perovskite Light-Emitting Diodes Based on Organotrichlorosilane Post-Treatment. / Zou, Guangruixing; Li, Zhenchao; Chen, Ziming; Chu, Linghao; Yip, Hin-Lap; Cao, Yong.

In: Advanced Functional Materials, Vol. 31, No. 46, 2103219, 11.2021.

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