In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 10, No. 6 ( 2022), p. 2109-2120
Abstract:
Polymer host materials have great potential for enabling small molecular thermally activated delayed fluorescence (TADF) emitters to construct solution-processed organic light-emitting diodes (OLEDs). Herein, four novel benzonitrile-based polymer hosts, P4CzCN–PA, P4CzCN–BCz (1 : 4), P4CzCN–BCz (1 : 1) and P4CzCN–BCz (4 : 1), with TADF characteristics and simple synthesis processes are fully characterized. All the polymers have high triplet energies ( 〉 2.68 eV) for effective exciton confining and AIE property for suppressing exciton quenching. By using homopolymerized P4CzCN–PA as the host material, the solution-processed green and blue TADF-OLEDs achieved the maximum external quantum efficiency (EQE) as high as 20.9% and 13.4%, respectively, which are almost 6 times higher than its copolymerized counterpart. This result demonstrates that the TADF polymer host with AIE property can inhibit its concentration quenching without the need for a complicated copolymerization of the bulky monomer. As far as we know, this is the first report of a benzonitrile-based TADF polymer and the final cost of the polymer is lower without any noble metal catalyst or high boiling point solvent. This strategy of using a benzonitrile-based homopolymer as the host materials of OLEDs provides a direction for the design of easy synthesis and low-cost polymer host materials in the future.
Type of Medium:
Online Resource
ISSN:
2050-7526
,
2050-7534
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702245-6
detail.hit.zdb_id:
2705156-0
