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Origin of the exclusive ternary electroluminescent behavior of BN-doped nanographenes in efficient single-component white light-emitting electrochemical cells

Fresta, Elisa, Dosso, Jacopo, Cabanillas-González, Juan, Bonifazi, Davide and Costa, Rubén D. 2020. Origin of the exclusive ternary electroluminescent behavior of BN-doped nanographenes in efficient single-component white light-emitting electrochemical cells. Advanced Functional Materials , 1906830. 10.1002/adfm.201906830
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Abstract

White‐light‐emitting electrochemical cells (WLECs) still represent a significant milestone, since only a few examples with moderate performances have been reported. Particularly, multiemissive white emitters are highly desired, as a paradigm to circumvent phase separation and voltage‐dependent emission color issues that are encountered following host:guest and multilayered approaches. Herein, the origin of the exclusive white ternary electroluminescent behavior of BN‐doped nanographenes with a B3N3 doping pattern (hexa‐perihexabenzoborazinocoronene) is rationalized, leading to one of the most efficient (≈3 cd A−1) and stable‐over‐days single‐component and single‐layered WLECs. To date, BN‐doped nanographenes have featured blue thermally activated delayed fluorescence (TADF). This doping pattern provides, however, white electroluminescence spanning the whole visible range (x/y CIE coordinates of 0.29–31/0.31–38 and average color rendering index (CRI) of 87) through a ternary emission involving fluorescence and thermally activated dual phosphorescence. This temperature‐dependent multiemissive mechanism is operative for both photo‐ and electroluminescence processes and holds over the device lifespan, regardless of the device architecture, active layer composition, and operating conditions. As such, this work represents a new stepping‐stone toward designing a new family of multiemissive white emitters based on BN‐doped nanographenes that realizes one of the best‐performing single‐component white‐emitting devices compared to the prior‐art.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Chemistry
Publisher: Wiley
ISSN: 1616-301X
Date of First Compliant Deposit: 3 February 2020
Date of Acceptance: 17 December 2019
Last Modified: 11 Mar 2020 17:15
URI: http://orca-mwe.cf.ac.uk/id/eprint/129274

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