Universal surface tailoring of perovskite nanocrystals via organic pseudohalide ligands applicable to green and blue light-emitting diodes

Jaewan Ko, Hyeondoo Je, Kitae Kim, Taejun Eom, Joonyoung F. Joung, Sungnam Park, Joona Bang, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

Abstract

Proper management of surface defects in perovskite nanocrystals (PeNCs) has resulted in near-unity photoluminescence quantum yield and the development of high-performance light-emitting diodes (LEDs). However, most PeNCs still suffer from incomplete surface passivation, which results in non-ideal efficiencies. Herein, we devise a simple surface tailoring of CsPbBr3 NCs with organic pseudohalide ligands, didodecyldimethylammonium tetrafluoroborate (DDA-BF4). Results suggest that the DDA cation and BF4 anion simultaneously coordinated on the CsPbBr3 NC surfaces, thereby dramatically improving optical properties and colloidal stability. With this passivation, surface-tailored CsPbBr3 NCs were applied to green LEDs, which showed significantly higher external quantum efficiencies than LEDs with untreated PeNCs and stable electroluminescence (EL) at a wavelength of 516 nm. Also, when this method was applied to sky-blue LED based on CsPbBr3−xClx NCs (EL at 484 nm), similar improvement in device performance was observed. We believe that organic pseudohalide treatment provides a universal methodology that can be applicable to green and blue PeNC-based LEDs, providing a promising platform for future displays and lighting technologies.

Original languageEnglish
Pages (from-to)18226-18233
Number of pages8
JournalJournal of Materials Chemistry C
Volume10
Issue number48
DOIs
Publication statusPublished - 2022 Nov 22

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2021R1A2C2006167 and 2019R1A6A1A11044070) and by the Creative Materials Discovery Program through an NRF grant funded by MSIT (No. 2018M3D1A1058536). This work was also supported by the LG Display (C2021007630).

Publisher Copyright:
© 2022 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Materials Chemistry

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