Azaborine as a Versatile Weak Donor for Thermally Activated Delayed Fluorescence

Pagidi Sudhakar; Suman Kuila; Kleitos Stavrou; Andrew Danos; Alexandra M.Z. Slawin; Andrew Monkman; Eli Zysman-Colman

doi:10.1021/acsami.3c05409

Azaborine as a Versatile Weak Donor for Thermally Activated Delayed Fluorescence

Pagidi Sudhakar, Suman Kuila, Kleitos Stavrou, Andrew Danos, Alexandra M.Z. Slawin, Andrew Monkman, Eli Zysman-Colman

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9 Scopus citations

Abstract

Extensive research has been devoted to the development of thermally activated delayed fluorescence emitters, especially those showing pure-blue emission for use in lighting and full-color display applications. Toward that goal, herein we report a novel weak donor, 1,4-azaborine (AZB), with complementary electronic and structural properties compared to the widely used dimethylacridan (DMAC) or carbazole (Cz) donors. Coupled with a triazine acceptor, AZB-Ph-TRZ is the direct structural analogue of the high-performance and well-studied green TADF emitter DMAC-TRZ and has ΔE_ST = 0.39 eV, a photoluminescence quantum yield (Φ_PL) of 27%, and λ_PL = 415 nm in 10 wt % doped mCP films. The shortened analogue AZB-TRZ possesses red-shifted emission with a reduced singlet-triplet gap (ΔE_ST = 0.01 eV) and fast reverse intersystem crossing (k_RISC of 5 × 10⁶ s^-1) in mCP. Despite a moderate Φ_PL of 34%, OLEDs with AZB-TRZ in mCP showed sky-blue emission with CIE₁₉₃₁(x,y) of (0.22,0.39) and a maximum external quantum efficiency (EQE_max) of 10.5%. Expanding the chemist’s toolkit for the design of blue donor-acceptor TADF materials will enable yet further advances in the future, as AZB is paired with a wider range of acceptor groups.

Original language	English
Pages (from-to)	25806-25818
Number of pages	13
Journal	ACS Applied Materials and Interfaces
Volume	15
Issue number	21
DOIs	https://doi.org/10.1021/acsami.3c05409
State	Published - 31 May 2023
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2023 The Authors. Published by American Chemical Society.

Funding

This project was funded by European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska Curie grant agreements No. 891606 (TADFNIR) and 812872 (TADFlife). P.S. acknowledges financial support from the Marie Skłodowska-Curie Individual Fellowship. S.K. and A.M. acknowledge financial support from the EPSRC (EP/T02240 X/1).

Funders	Funder number
Horizon 2020 Framework Programme	812872, 891606
H2020 Marie Skłodowska-Curie Actions
Engineering and Physical Sciences Research Council	EP/T02240 X/1

Keywords

azaborine donor
donor−acceptor
organic light-emitting diodes
thermally activated delayed fluorescence
triazine

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10.1021/acsami.3c05409

Cite this

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abstract = "Extensive research has been devoted to the development of thermally activated delayed fluorescence emitters, especially those showing pure-blue emission for use in lighting and full-color display applications. Toward that goal, herein we report a novel weak donor, 1,4-azaborine (AZB), with complementary electronic and structural properties compared to the widely used dimethylacridan (DMAC) or carbazole (Cz) donors. Coupled with a triazine acceptor, AZB-Ph-TRZ is the direct structural analogue of the high-performance and well-studied green TADF emitter DMAC-TRZ and has ΔEST = 0.39 eV, a photoluminescence quantum yield (ΦPL) of 27%, and λPL = 415 nm in 10 wt % doped mCP films. The shortened analogue AZB-TRZ possesses red-shifted emission with a reduced singlet-triplet gap (ΔEST = 0.01 eV) and fast reverse intersystem crossing (kRISC of 5 × 106 s-1) in mCP. Despite a moderate ΦPL of 34%, OLEDs with AZB-TRZ in mCP showed sky-blue emission with CIE1931(x,y) of (0.22,0.39) and a maximum external quantum efficiency (EQEmax) of 10.5%. Expanding the chemist{\textquoteright}s toolkit for the design of blue donor-acceptor TADF materials will enable yet further advances in the future, as AZB is paired with a wider range of acceptor groups.",

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Azaborine as a Versatile Weak Donor for Thermally Activated Delayed Fluorescence

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Keywords

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