Highly Efficient Carbazolylgold(iii) Dendrimers Based on Thermally Activated Delayed Fluorescence and Their Application in Solution-processed Organic Light-emitting Devices

Overview

Journal Chem Sci

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2021 Nov 25

PMID 34820099

Citations 1

Authors

Lok-Kwan Li

Wing-Kei Kwok

Man-Chung Tang

Wai-Lung Cheung

Shiu-Lun Lai

Maggie Ng

Mei-Yee Chan

Vivian Wing-Wah Yam

Affiliations

Soon will be listed here.

Abstract

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 s 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, maximum external quantum efficiency of 15.8% and high power efficiency of 41.3 lm W. 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, respectively, representing the first demonstration of operationally stable solution-processed OLEDs based on gold(iii) dendrimers.

Citing Articles

Carbazolylgold(iii) complexes with thermally activated delayed fluorescence switched on by ligand manipulation as high efficiency organic light-emitting devices with small efficiency roll-offs.

Wong C, Tang M, Li L, Leung M, Tang W, Lai S Chem Sci. 2022; 13(34):10129-10140.

PMID: 36128251 PMC: 9430534. DOI: 10.1039/d2sc03037c.

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