Perovskite Nanocrystals Protected by Hermetically Sealing for Highly Bright and Stable Deep-Blue Light-Emitting Diodes

Yongju Hong, Chungman Yu, Hyeondoo Je, Jin Young Park, Taekyung Kim, Hionsuck Baik, Gracita M. Tomboc, Youngseo Kim, Jung Min Ha, Jinwhan Joo, Chai Won Kim, Han Young Woo, Sungnam Park, Dong Hoon Choi, Kwangyeol Lee

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Metal–halide perovskite nanocrystals (NCs) have emerged as suitable light-emitting materials for light-emitting diodes (LEDs) and other practical applications. However, LEDs with perovskite NCs undergo environment-induced and ion-migration-induced structural degradation during operation; therefore, novel NC design concepts, such as hermetic sealing of the perovskite NCs, are required. Thus far, viable synthetic conditions to form a robust and hermetic semiconducting shell on perovskite NCs have been rarely reported for LED applications because of the difficulties in the delicate engineering of encapsulation techniques. Herein, a highly bright and durable deep-blue perovskite LED (PeLED) formed by hermetically sealing perovskite NCs with epitaxial ZnS shells is reported. This shell protects the perovskite NCs from the environment, facilitates charge injection/transport, and effectively suppresses interparticle ion migration during the LED operation, resulting in exceptional brightness (2916 cd m−2) at 451 nm and a high external quantum efficiency of 1.32%. Furthermore, even in the unencapsulated state, the LED shows a long operational lifetime (T50) of 1192 s (≈20 min) in the air. These results demonstrate that the epitaxial and hermetic encapsulation of perovskite NCs is a powerful strategy for fabricating high-performance deep-blue-emitting PeLEDs.

Original languageEnglish
Article number2302906
JournalAdvanced Science
Volume10
Issue number23
DOIs
Publication statusPublished - 2023 Aug 15

Bibliographical note

Funding Information:
Y.H., C.Y., H.J., and J.Y.P. contributed equally to this work. This work was supported by National Research Foundation of Korea (NRF, grant number 2019R1A6A1A11044070, NRF–2020R1A2B5B03002475, and 2022R1A2B5B02001454). Y. Hong acknowledges the Global Ph.D. Fellowship (NRF–2018H1A2A1062618). This work was supported by LG Display under LGD–Korea university Incubation Program (C2022008162). The authors also thank KBSI Seoul Centre, Busan Centre, and Jeonju Centre to use their HRTEM, XPS, and UPS instruments.

Funding Information:
Y.H., C.Y., H.J., and J.Y.P. contributed equally to this work. This work was supported by National Research Foundation of Korea (NRF, grant number 2019R1A6A1A11044070, NRF–2020R1A2B5B03002475, and 2022R1A2B5B02001454). Y. Hong acknowledges the Global Ph.D. Fellowship (NRF–2018H1A2A1062618). This work was supported by LG Display under LGD–Korea university Incubation Program (C2022008162). The authors also thank KBSI Seoul Centre, Busan Centre, and Jeonju Centre to use their HRTEM, XPS, and UPS instruments.

Publisher Copyright:
© 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.

Keywords

  • core/shell
  • deep-blue
  • high brightness
  • light-emitting diodes
  • metal–halide perovskites

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • General Chemical Engineering
  • General Materials Science
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • General Engineering
  • General Physics and Astronomy

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