Efficiently red-emitting dimethoxybenzothiadiazoles for organic doping-free devices enabling stable warm-white electroluminescence

Stepan Kutsiy; Lyudmyla Kanibolotska; Alexander Kanibolotsky; Mykhailo Shchetinin; Khrystyna Ivaniuk; Pavlo Stakhira; Asta Dabuliene; Dmytro Volyniuk; Joseph Cameron; Juozas V Grazulevicius; Iryna Yaremchuk; Peter J Skabara

doi:10.1039/d6tc01121g

Title	Efficiently red-emitting dimethoxybenzothiadiazoles for organic doping-free devices enabling stable warm-white electroluminescence
Authors	Kutsiy, Stepan ; Kanibolotska, Lyudmyla ; Kanibolotsky, Alexander ; Shchetinin, Mykhailo ; Ivaniuk, Khrystyna ; Stakhira, Pavlo ; Dabuliene, Asta ; Volyniuk, Dmytro ; Cameron, Joseph ; Grazulevicius, Juozas V ; Yaremchuk, Iryna ; Skabara, Peter J
DOI	10.1039/d6tc01121g
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Is Part of	Journal of materials chemistry C.. Cambridge : Royal Society of Chemistry. 2026, Early access. ISSN 2050-7534. eISSN 2050-7526
Abstract [eng]	The study provides guidance for developing doping-free white organic light-emitting diodes (OLEDs) with single or double light-emitting layers and offers insights into molecular structure–property relationships for highly efficient dimethoxybenzothiadiazole-based emitters. To achieve white electroluminescence, newly synthesised dimethoxybenzothiadiazole derivatives were used as red fluorescent emitters in combination with emitters exhibiting efficient thermally activated delayed fluorescence (TADF), such as a sky-blue exciplex emitter or a conventional green emitter. The developed compounds exhibit photoluminescence quantum efficiencies of up to 98% in solutions, hole mobilities exceeding 1 104 cm2 V1 s1 at electric fields above 1 106 V cm1, ionisation energies of ca. 5.6 eV, and electron affinities of ca. 3.4 eV. These properties enabled us to fabricate doping-free OLEDs with an external quantum efficiency (EQE) of up to 3.34% and red electroluminescence with CIE1931 (x, y) colour coordinates (0.54, 0.36). The sky-blue exciplex-based TADF emitter tunes the colour coordinates and enhances EQE by up to 8.5%. The green TADF emitter enabled us to achieve stable warm-white electroluminescence in OLEDs with double, fully doping-free light-emitting layers, exhibiting EQE up to 8.23%, and colour coordinates of x up to 0.43, and y up to 0.38.
Published	Cambridge : Royal Society of Chemistry
Type	Journal article
Language	English
Publication date	2026
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„Efficiently red-emitting dimethoxybenzothiadiazoles for organic doping-free devices enabling stable warm-white electroluminescence“