Formadinium Cation Doping Stabilized Ultra-deep-blue Lead Halide Perovskite Nanocrystal Light-emitting Diodes

doi:10.1007/s40242-024-4065-x

Chemical Research in Chinese Universities ›› 2024, Vol. 40 ›› Issue (3): 556-560.doi: 10.1007/s40242-024-4065-x

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Formadinium Cation Doping Stabilized Ultra-deep-blue Lead Halide Perovskite Nanocrystal Light-emitting Diodes

Pui Kei KO, Jonathan E. HALPERT

Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon, Hong Kong 999077, P. R. China

Received:2024-03-15 Online:2024-06-01 Published:2024-06-01
Contact: Jonathan E. HALPERT,E-mail:jhalpert@ust.hk E-mail:jhalpert@ust.hk
Supported by:
This work was supported by the Funding from the School of Science and Department of Chemistry at the Hong Kong University of Science and Technology (HKUST), China (No. IRS22SC117), the Research Grants Council/University Grants Committee (RGC/UGC) (No. 16306020), and ITF-midstream Grant from the Innovation and Technology Commission (ITC) (No. ITS/059/22MX). We also thank the technical support teams from the Materials Characterization and Preparation Facility (MCPF) of HKUST.

Abstract

Abstract: The halide migration effect in mixed-halide lead-based perovskite is a serious problem hindering the development of its display technology. In this study, we have successfully addressed this issue by reporting formadinium (FA) doped mixed-halide perovskite nanocrystals (NCs) with ultra-deep-blue emission of 450 nm, narrow bandwidth of 16 nm, and a high photoluminescence quantum yield (PLQY) of 66%. The perovskite nanocrystal light-emitting diodes (NC-LEDs) using this nanocrystal as an active layer achieved a maximum external quantum efficiency (EQE) of 0.32%, 30-fold improved compared to that of pristine and stable electroluminescence (EL) spectra at 450 nm under a 4.9—8.0 V bias. These findings demonstrate the potential of our approach in developing stable and efficient deep blue perovskite NC-LEDs.

Key words: Halide perovskite, Light-emitting diode, Deep-blue

Pui Kei KO, Jonathan E. HALPERT. Formadinium Cation Doping Stabilized Ultra-deep-blue Lead Halide Perovskite Nanocrystal Light-emitting Diodes[J]. Chemical Research in Chinese Universities, 2024, 40(3): 556-560.

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Formadinium Cation Doping Stabilized Ultra-deep-blue Lead Halide Perovskite Nanocrystal Light-emitting Diodes

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