Polymerized Thermally Activated Delayed-Fluorescence Small Molecules: Long-Axis Polymerization Leads to a Nearly Concentration-Independent Luminescence.
Aggregation-Caused Quenching
Aggregation-Induced Emission
Concentration-Independent Luminescence
PLEDs
Thermally Activated Delayed Fluorescence Polymers
Journal
Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
Titre abrégé: Angew Chem Int Ed Engl
Pays: Germany
ID NLM: 0370543
Informations de publication
Date de publication:
02 May 2023
02 May 2023
Historique:
received:
11
01
2023
medline:
10
3
2023
pubmed:
10
3
2023
entrez:
9
3
2023
Statut:
ppublish
Résumé
Nowadays numerous thermally activated delayed fluorescence (TADF) polymers have been developed for PLEDs to realize high device performance and tunable emission colors. However, they often possess a strong concentration dependence on their luminescence including aggregation-caused quenching (ACQ) and aggregation-induced emission (AIE). Herein, we first report a nearly concentration-independent TADF polymer based on the strategy of polymerized TADF small molecules. It is found that when a donor-acceptor-donor (D-A-D) type TADF small molecule is polymerized through its long-axis direction, the triplet state is distributed along the polymeric backbone to effectively suppress the unwanted concentration quenching. Unlike the short-axis one with an ACQ effect, the photoluminescent quantum yield (PLQY) of the resultant long-axis polymer remains almost unchanged with the increasing doping concentration. Accordingly, a promising external quantum efficiency (EQE) up to 20 % is successfully achieved in a whole doping control window of 5-100 wt. %.
Identifiants
pubmed: 36892571
doi: 10.1002/anie.202300529
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e202300529Subventions
Organisme : CAS-Croucher Funding Scheme for Joint Laboratories
Organisme : the Youth Innovation Promotion Association CAS
ID : 2021222
Organisme : National Natural Science Foundation of China
ID : 52273198,52173186
Organisme : the Scientific Research Foundation for Introduced Talents of Yunnan University
ID : CZ21623201
Informations de copyright
© 2023 Wiley-VCH GmbH.
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