Energy-well band structure for enhanced exciton confinement effect in perovskite light-emitting diodes via spray-coating

Jin Kyoung Park, Jin Hyuck Heo, Hyong Joon Lee, Bong Woo Kim, Sang Woo Park, Ki Ha Hong, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

Abstract

Perovskites possess bright emission and high color purity, but constructing strong charge confinement is requisite for application in efficient light-emitting diodes. Here, we demonstrate a breakthrough to enhance the exciton confinement effect by introducing a Cs4PbBr6 layer on a CsPbBr3 perovskite film through the spray-coating deposition. The impact of the Cs4PbBr6 layer is thoroughly investigated and indicates that the Cs4PbBr6 layer results in a confined energy-wall band structure and a stronger exciton binding energy. Accordingly, the CsPbBr3 film with Cs4PbBr6 wall exhibits higher photoluminescence (PL) and electroluminescence (EL) from the perovskite light-emitting diodes (PeLEDs). We further optimize the device architecture in an energy-well band structure by sandwiching the CsPbBr3 between the Cs4PbBr6 buried layer and overlayer. As a result, the PeLED with Cs4PbBr6 well exhibits ∼18 nm of full width at half maximum (FWHM) in the emission spectrum, 25,738 cd m−2 of maximum luminance, 65.94 cd A−1 of maximum current efficiency (CE), 15.08% of maximum external quantum efficiency (EQE).

Original languageEnglish
Article number171499
JournalJournal of Alloys and Compounds
Volume965
DOIs
Publication statusPublished - 2023 Nov 25

Bibliographical note

Funding Information:
† J. K. Park and J. H. Heo have equally contributed to this work. This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science , ICT & Future Planning ( Basic Science Research Program [Grant No. 2021R1A5A6002853 ], [Grant No. 2022R1A2C3004964 ], [Grant No. 2022R1C1C2008126 ], [Grant No. 2022M3H4A1A03074093 ]), (Grant No. 2021R1A2B5B01002312 ). K. H. Hong acknowledge that this research was supported by the research fund of Hanbat National University in 2022. The Synopsys TCAD was supported by the IC Design Education Center . J. H. Heo acknowledges the supports by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20227410100040 )

Funding Information:
†J. K. Park and J. H. Heo have equally contributed to this work. This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science, ICT & Future Planning (Basic Science Research Program [Grant No. 2021R1A5A6002853], [Grant No. 2022R1A2C3004964], [Grant No. 2022R1C1C2008126], [Grant No. 2022M3H4A1A03074093]), (Grant No. 2021R1A2B5B01002312). K. H. Hong acknowledge that this research was supported by the research fund of Hanbat National University in 2022. The Synopsys TCAD was supported by the IC Design Education Center. J. H. Heo acknowledges the supports by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20227410100040)

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Energy-well
  • Exciton confinement
  • LED
  • Perovskite
  • Spray-coating

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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