Origin of the Exclusive Ternary Electroluminescent Behavior of BN-Doped Nanographenes in Efficient Single-Component White Light-Emitting Electrochemical Cells

Elisa Fresta, Jacopo Dosso, Juan Cabanillas-González, Davide Bonifazi, Rubén D. Costa

研究成果: Article査読

9 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号1906830
ジャーナルAdvanced Functional Materials
30
33
DOI
出版ステータスPublished - 2020 8 1

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学

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