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Efficient and Stable Blue Light Emitting Diodes Based on CsPbBr3 Nanoplatelets with Surface Passivation by a Multifunctional Organic Sulfate
Journal article   Peer reviewed

Efficient and Stable Blue Light Emitting Diodes Based on CsPbBr3 Nanoplatelets with Surface Passivation by a Multifunctional Organic Sulfate

He Liu, Michael Worku, Animesh Mondal, Tunde Blessed Shonde, Maya Chaaban, Azza Ben-Akacha, Sujin Lee, Fabiola Gonzalez, Oluwadara Olasupo, Xinsong Lin, …
Advanced energy materials, Vol.13(33), 2201605
09/01/2023
DOI: https://doi.org/10.1002/aenm.202201605
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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