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Modifications of Pyridine-3,5-dicarbonitrile Acceptor for Highly Efficient Green-to-Red Organic Light-Emitting Diodes.

Authors :
Deng SL
Chen YK
Lei J
Jayakumar J
Ko CL
Hung WY
Wu TL
Cheng CH
Source :
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2023 Jul 19; Vol. 15 (28), pp. 33819-33828. Date of Electronic Publication: 2023 Jul 07.
Publication Year :
2023

Abstract

The strategy of acceptor modification is a powerful technique for tuning the emission color of thermally activated delayed fluorescence (TADF) emitters. In this study, we have successfully designed and synthesized three TADF emitters with donor-acceptor (D-A) structures using a 4-(diphenylamino)-2,6-dimethylphenyl (TPAm) donor and various pyridine-3,5-dicarbonitrile (PC) acceptor units. As a result, three compounds named TPAmbPPC, TPAm2NPC, and TPAmCPPC exhibited greenish-yellow to orange-red emissions with high photoluminescent quantum yields (76-100%) in thin films. Remarkably, a greenish-yellow device based on TPAmbPPC and TPAm2NPC showed a high maximum external quantum efficiency (EQE <subscript>max</subscript> ) of 39.1 and 39.0%, respectively. Furthermore, benefiting from the suitable steric hindrance between the acceptor and donor, the nondoped organic light-emitting diodes (OLEDs) based on TPAmbPPC demonstrated an exceptional EQE <subscript>max</subscript> of 21.6%, indicating its promising potential as an efficient emitter for the application of OLED applications. Furthermore, orange-red OLED devices based on TPAmCPPC exhibited a high EQE <subscript>max</subscript> of 26.2%, a CE of 50.1 cd A <superscript>-1</superscript> , and a PE of 52.4 lm W <superscript>-1</superscript> .

Details

Language :
English
ISSN :
1944-8252
Volume :
15
Issue :
28
Database :
MEDLINE
Journal :
ACS applied materials & interfaces
Publication Type :
Academic Journal
Accession number :
37418573
Full Text :
https://doi.org/10.1021/acsami.3c05243