Journal article
Efficient and Stable Blue Light Emitting Diodes Based on CsPbBr3 Nanoplatelets with Surface Passivation by a Multifunctional Organic Sulfate
Advanced energy materials, Vol.13(33), 2201605
09/01/2023
Web of Science ID: WOS:000828697600001
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Abstract
Metal halide perovskite nanocrystals (NCs) have emerged as highly promising light emitting materials for various applications, ranging from perovskite light-emitting diodes (PeLEDs) to lasers and radiation detectors. While remarkable progress has been achieved in highly efficient and stable green, red, and infrared perovskite NCs, obtaining efficient and stable blue-emitting perovskite NCs remains a great challenge. Here, a facile synthetic approach for the preparation of blue emitting CsPbBr3 nanoplatelets (NPLs) with treatment by an organic sulfate is reported, 2,2-(ethylenedioxy) bis(ethylammonium) sulfate (EDBESO4), which exhibit remarkably enhanced photoluminescence quantum efficiency (PLQE) and stability as compared to pristine CsPbBr3 NPLs coated with oleylamines. The PLQE is improved from approximate to 28% for pristine CsPbBr3 NPLs to 85% for EDBESO4 treated CsPbBr3 NPLs. Detailed structural characterizations reveal that EDBESO4 treatment leads to surface passivation of CsPbBr3 NPLs by both EDBE2+ and SO42- ions, which helps to prevent the coalescence of NPLs and suppress the degradation of NPLs. A simple proof-of-concept device with emission peaked at 462 nm exhibits an external quantum efficiency of 1.77% with a luminance of 691 cd m(-2) and a half-lifetime of 20 min, which represents one of the brightest pure blue PeLEDs based on NPLs reported to date.
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Details
- Title
- Efficient and Stable Blue Light Emitting Diodes Based on CsPbBr3 Nanoplatelets with Surface Passivation by a Multifunctional Organic Sulfate
- Publication Details
- Advanced energy materials, Vol.13(33), 2201605
- Resource Type
- Journal article
- Publisher
- Wiley
- Number of pages
- 9
- Grant note
- FSU Office of Research ECCS-1912911; CHE-2005079; DMR-1644779; CHE-1919633 / National Science Foundation; National Science Foundation (NSF) State of Florida
- Copyright
- © 2022 Wiley-VCH GmbH
- Identifiers
- WOS:000828697600001; 99381443120406600
- Academic Unit
- Chemistry; Hal Marcus College of Science and Engineering
- Language
- English