| Title |
Carbazolyl-substituted benzoic anhydrides as efficient triplet harvesters for high-brightness blue organic light-emitting diodes |
| Authors |
Aksionova, Myroslava ; Ivaniuk, Khrystyna ; Lytvyn, Roman ; Kutsiy, Stepan ; Kaszubowski, Oskar ; Kinzhybalo, Vasyl ; Dabulienė, Asta ; Volyniuk, Dmytro ; Obushak, Mykola D ; Grazulevicius, Juozas Vidas ; Potopnyk, Mykhaylo A |
| DOI |
10.1021/acsami.6c11053 |
| Full Text |
|
| Is Part of |
ACS Applied materials and interfaces.. Washington : American Chemical Society. 2026, Early access, p. 1-13.. ISSN 1944-8244. eISSN 1944-8252 |
| Keywords [eng] |
thermally activated delayed fluorescence ; room-temperature phosphorescence ; electroluminescence ; OLED ; low efficiency roll-off |
| Abstract [eng] |
A simple and efficient synthetic strategy for the preparation of carbazole-basedC2-symmetric anhydrides with donor-acceptor-donor (D-A-D) architecture is presented. Four benzoic anhydrides incorporating carbazole or 3,6-di-tert-butylcarbazole donor units, linked to the anhydride acceptor moiety through either para- or ortho-positions, are rationally designed, synthesized, and systematically investigated. Photophysical studies reveal a strong dependence of photophysical properties on the linkage topology. While para-linked derivatives exhibit neither delayed fluorescence nor phosphorescence, ortho-substituted anhydrides display small singlet-triplet energy gaps and consequently show thermally activated delayed fluorescence (TADF), as well as unexpected room-temperature phosphorescence (RTP). Therefore, compounds bearing ortho-linked carbazole donor moieties are successfully employed as triplet-harvesting emitters in sky-blue organic light-emitting diodes (OLEDs), delivering electroluminescence maxima at 475 and 481 nm, maximum external quantum efficiencies of up to 21.0%, high luminance exceeding 62 000 cd/m2, and low efficiency roll-off. These results demonstrate that the formation of anhydrides from donor-substituted aromatic acids represents a versatile and effective design strategy for highly emissive TADF/RTP materials and provides a promising platform for the development of efficient multicolor OLED emitters through rational molecular engineering. |
| Published |
Washington : American Chemical Society |
| Type |
Journal article |
| Language |
English |
| Publication date |
2026 |
| CC license |
|
