Highly efficient carbazolylgold() dendrimers based on thermally activated delayed fluorescence and their application in solution-processed organic light-emitting devices

A new class of C^C^N ligand-containing carbazolylgold( iii ) dendrimers has been designed and synthesized. High photoluminescence quantum yields of up to 82% in solid-state thin films and large radiative decay rate constants in the order of 10 5 s −1 are observed. These gold( iii ) dendrimers are fo...

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Bibliographic Details
Published in:Chemical science (Cambridge) 2021-11, Vol.12 (44), p.14833-14844
Main Authors: Li, Lok-Kwan, Kwok, Wing-Kei, Tang, Man-Chung, Cheung, Wai-Lung, Lai, Shiu-Lun, Ng, Maggie, Chan, Mei-Yee, Yam, Vivian Wing-Wah
Format: Article
Language:English
Subjects:
Chemistry
Current efficiency
Decay rate
Dendrimers
Devices
Efficiency
Emission analysis
Fluorescence
Gold
Organic light emitting diodes
Photoluminescence
Power efficiency
Quantum efficiency
Rate constants
Thin films
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Summary:A new class of C^C^N ligand-containing carbazolylgold( iii ) dendrimers has been designed and synthesized. High photoluminescence quantum yields of up to 82% in solid-state thin films and large radiative decay rate constants in the order of 10 5 s −1 are observed. These gold( iii ) dendrimers are found to exhibit thermally activated delayed fluorescence (TADF), as supported by variable-temperature emission spectroscopy, time-resolved photoluminescence decay and computational studies. Solution-processed organic light-emitting diodes (OLEDs) based on these gold( iii ) dendrimers have been fabricated, which exhibit a maximum current efficiency of 52.6 cd A −1 , maximum external quantum efficiency of 15.8% and high power efficiency of 41.3 lm W −1 . The operational stability of these OLEDs has also been recorded, with the devices based on zero- and second-generation dendrimers showing maximum half-lifetimes of 1305 and 322 h at 100 cd m −2 , respectively, representing the first demonstration of operationally stable solution-processed OLEDs based on gold( iii ) dendrimers. A new class of carbazolylgold( iii ) C^C^N dendrimers with thermally activated delayed fluorescence properties has been designed and synthesized for the realzaqtion of operationally stable solution-processed organic light-emitting devices.
ISSN:2041-6520
2041-6539
DOI:10.1039/d1sc03690d