Dicyano-Imidazole: A Facile Generation of Pure Blue TADF Materials for OLEDs.
blue-emitting
electroluminescence
imidazole
organic light-emitting diodes
thermally activated delayed fluorescence
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Titre abrégé: Chemistry
Pays: Germany
ID NLM: 9513783
Informations de publication
Date de publication:
09 Sep 2021
09 Sep 2021
Historique:
received:
21
05
2021
pubmed:
22
7
2021
medline:
22
7
2021
entrez:
21
7
2021
Statut:
ppublish
Résumé
A series of dicyano-imidazole-based molecules with thermally activated delayed fluorescence (TADF) properties were synthesized to obtain pure blue-emitting organic light-emitting diodes (OLEDs). The targeted molecules used dicyano-imidazole with a short-conjugated system as the electron acceptor to strong intermolecular π-π interactions, and provide a relatively shallow energy level of the lowest unoccupied molecular orbital (LUMO). The cyano group was selected to improve imidazole as an electron acceptor due to its prominent electron-transporting characteristics. Four different electron donors, that is, 9,9-dimethyl-9,10-dihydroacridine (DMAC), 10H-spiro(acridine-9,9'-fluoren) (SPAC), and 9,9-diphenyl-9,10-dihydroacridine (DPAC), were used to alternate the highest occupied molecular orbital (HOMO) energy level to tune the emission color further. The crowded molecular structure in space makes the electron donor and acceptor almost orthogonal, reducing the energy gap (ΔE
Identifiants
pubmed: 34288149
doi: 10.1002/chem.202101807
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
12998-13008Subventions
Organisme : Ministry of Science and Technology, Taiwan
ID : MOST 109-2113-M-126-002
Organisme : Ministry of Science and Technology, Taiwan
ID : MOST 109-2221-E-155-052
Informations de copyright
© 2021 Wiley-VCH GmbH.
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