Issue 6, 2022

A meta-linkage strategy towards high-performance hosts for efficient blue thermally activated delayed fluorescence OLEDs

Abstract

The development of high-performance host materials for blue thermally activated delayed fluorescence (TADF) emitters is crucial for realizing efficient blue organic light-emitting diodes (OLEDs). Herein, two star-shaped host materials, tris(3-(diphenylphosphanyl oxide)phenyl)phosphane oxide (m4PO) and tris(3-(carbazole)phenyl)phosphane oxide (m3CzPO), containing a triphenylphosphine oxide (TPPO) core and three meta-substituted diphenylphosphine oxide or carbazolyl groups, are designed and synthesized. The comparative study reveals that the meta-linkage strategy significantly improves the performances of the hosts. The two hosts show superhigh triplet energies of over 3.1 eV, along with high thermal stability, good carrier-transporting capability, and high film quality, which establish the basis for being potentially ideal hosts for blue TADF emitters. Based on a conventional blue TADF emitter bis[4-(9,9-dimethyl-9,10-dihydroacridine)phenyl]sulfone (DMAC-DPS), the blue TADF-OLEDs realize high performances with maximum external quantum efficiencies (EQEs) beyond 20%, maximum power efficiencies (PEs) over 40 lm W−1, a low turn-on voltage of 2.8 V, and a high luminance of up to 5170 nits.

Graphical abstract: A meta-linkage strategy towards high-performance hosts for efficient blue thermally activated delayed fluorescence OLEDs

Supplementary files

Article information

Article type
Research Article
Submitted
27 dec 2021
Accepted
25 jan 2022
First published
27 jan 2022

Mater. Chem. Front., 2022,6, 748-756

A meta-linkage strategy towards high-performance hosts for efficient blue thermally activated delayed fluorescence OLEDs

X. Tao, Z. Wei, L. Meng, X. Chen, M. Yang, Y. Jing, D. Zhang and C. Lu, Mater. Chem. Front., 2022, 6, 748 DOI: 10.1039/D1QM01660A

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