Jump to main content
Jump to site search


Double-twist pyridine–carbonitrile derivatives yielding excellent thermally activated delayed fluorescence emitters for high-performance OLEDs

Author affiliations

Abstract

Possessing high photoluminescence quantum yield (PLQY) and fast reverse intersystem crossing (RISC) process are critical for obtaining efficient thermally activated delayed fluorescence (TADF) emitters. Herein, two donor–spacer–acceptor molecules, namely, 4-(4-(9,9-dimethylacridin-10(9H)-yl)phenyl)-2,6-dimethylpyridine-3,5-dicarbonitrile (Me-DMAC) and 4-(4-(10H-phenoxazin-10-yl)phenyl)-2,6-dimethylpyridine-3,5-dicarbonitrile (Me-PXZ), were developed via a double-twist design strategy. The large hindrance induces a twisted geometry, leading to small ΔEST values and fast RISC processes. The time-resolved photophysical measurements revealed the TADF emissions of these pyridine-3,5-dicarbonitrile-based molecules in doped thin films. High external quantum efficiency (EQE) values of 25.8% and 21.1% were achieved in organic light-emitting diodes (OLEDs) using green Me-DMAC and yellow Me-PXZ dyes, respectively, as emitters.

Graphical abstract: Double-twist pyridine–carbonitrile derivatives yielding excellent thermally activated delayed fluorescence emitters for high-performance OLEDs

Back to tab navigation

Supplementary files

Publication details

The article was received on 29 Sep 2019, accepted on 17 Nov 2019 and first published on 18 Nov 2019


Article type: Paper
DOI: 10.1039/C9TC05340A
J. Mater. Chem. C, 2020, Advance Article

  •   Request permissions

    Double-twist pyridine–carbonitrile derivatives yielding excellent thermally activated delayed fluorescence emitters for high-performance OLEDs

    J. Li, W. Chen, H. Liu, Z. Chen, D. Chai, C. Lee and C. Yang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05340A

Search articles by author

Spotlight

Advertisements