Organic Thermally Activated Delayed Fluorescence Material with Strained Benzoguanidine Donor

Submitting author affiliation:
University of Manchester, Manchester, United Kingdom

Beilstein Arch. 2023, 202326.

Published 28 Jun 2023

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Organic thermally activated delayed fluorescence materials (TADF) have been widely investigated due to their impressive electronic properties and applied potential for the third generation of organic light-emitting diodes (OLED). We present organic TADF material based on the strained benzoguanidine donor (4BGIPN) and compare it with the benchmark carbazole-based material (4CzIPN). Extended π-conjugation in 4BzIPN material results in yellow luminescence at 525 nm with a fast radiative rate of 1.15x10-6 s-1 and photoluminescence quantum yield of 46% in methylcyclohexane solution. Such a nitrogen-rich 4BGIPN material has a significantly stabilized highest occupied molecular orbital (HOMO) at –6.4 eV while the lowest unoccupied molecular orbital (LUMO) at -4.0 eV, indicating potential suitability for application as the electron transport layer or TADF class III emitter in OLEDs.

Keywords: Organic; TADF; yellow; guanidine; photoluminescence

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Brannan, A. C.; Beaumont, E. F. P.; Phuoc, N. L.; Whitehead, G. F. S.; Linnolahti, M.; Romanov, A. S. Beilstein Arch. 2023, 202326. doi:10.3762/bxiv.2023.26.v1

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