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Colour-encoded electroluminescent white light-emitting diode Eenabled by Perovskite-Cu-In-S quantum composites

Cho, Seung-Bum, Sohn, Jung Inn, Lee, Sang-Seok, Moon, Seung-Gyun, Hou, Bo ORCID: and Park, Il-Kyu 2021. Colour-encoded electroluminescent white light-emitting diode Eenabled by Perovskite-Cu-In-S quantum composites. Journal of Materials Chemistry. C 9 (22) , pp. 7027-7034. 10.1039/D1TC00683E

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Solution-processed quantum dot (QD) white light-emitting diodes (WLEDs) have received much attention as a viable light source in the next-generation large-area ambient lighting, flexible photonics and full-colour display backlighting technologies. Attributable to their solution processibility, tunable colour temperature, high quantum efficiency and high photostability, considerable research efforts have been spent on accumulating new insights into the materials and device architecture design for high-performance QD WLEDs. At present, prevalent research on WLEDs focuses on using QDs as a photoluminescence colour converter or using purely narrow linewidth QD LEDs to complement white colour spectra, which is not energy efficient as well as challenging to achieve Eye Comfort ambient colour coding. Herein, a quantum composite made from hybridising perovskite (CsPbBr3 and CsPb(Br1-xClx)3) and CuInS2 (CIS) QDs is proposed as a colour-encoded electroluminescence layer, which underpins good white colour temperature and bias stability for ambient lighting. Instead of using solely sharp emission QDs to match the white light spectra, broad light emission spectrum CIS QDs are used for colour temperature toning. In addition, the mixed-halide perovskite CsPb(Br1-xClx)3 QDs are successfully synthesised through a noninvasive halide ion exchange method associated with trimethylsilyl chloride additives, which provide a good colour purity in blue and green electroluminescence region. This rational-designed QD composites enable the as-prepared WLED electroluminescence spectra to match the ideal ambient light Commission International de l’Éclairage 1931 (CIE) colour coordinates with a mean value of 0.33, 0.34. Moreover, as-prepared WLEDs show a turn-on voltage of 4 V with negligibly small leakage current, good colour stability and electrical bias tolerance even under a broad range of driving voltages. Our results herald the advent of molecular level hybridisation of different quantum materials for high-performance electroluminescence white colour toning.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Additional Information: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence
Publisher: Royal Society of Chemistry
ISSN: 2050-7526
Date of First Compliant Deposit: 29 April 2021
Date of Acceptance: 23 April 2021
Last Modified: 06 Nov 2023 22:00

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