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Carbazolyl-Substituted Benzoic Anhydrides as Efficient Triplet Harvesters for High-Brightness Blue Organic Light-Emitting Diodes
Autorzy
Rok wydania
2026
Czasopismo
ACS Applied Materials and Interfaces
Numer woluminu
18
Strony
51286-51298
DOI
10.1021/acsami.6c11053
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
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.
Słowa kluczowe
thermally activated delayed fluorescence, room-temperature phosphorescence, electroluminescence, OLED, low efficiency roll-off
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Pełny tekst licencji: https://creativecommons.org/licenses/by/3.0/pl/legalcode
Adres publiczny
http://dx.doi.org/10.1021/acsami.6c11053
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