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Phenothiazine dioxide-containing derivatives as efficient hosts for blue, green and yellow thermally activated delayed fluorescence OLEDs

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Abstract

By conjugating 10-phenyl-10H-phenothiazine-5,5-dioxide (2PTO) with aromatic amine substituents (PhCz and DMACMN), three novel host materials namely 10-(9-phenyl-9H-carbazol-3-yl)-10H-phenothiazine 5,5-dioxide (3CzNPTO), (10-(4-(9H-carbazol-9-yl)phenyl)-10H-phenothiazine 5,5-dioxide (9CzNPTO) and 10-(4-(9,9-dimethylacridin-10(9H)-yl)-2,5-dimethylphenyl)-10H-phenothiazine 5,5-dioxide (DMACMNPTO) were designed and synthesized. DMACMNPTO with thermally activated delayed fluorescence (TADF) properties exhibited bipolar characteristics resulting from the completely separated HOMO/LUMO distribution. Using DMACMNPTO as a host for TADF emitters, devices showed a maximum external quantum efficiency (EQEmax), current efficiency (CEmax) and power efficiency (PEmax) of 18.3%, 33.3 cd A−1 and 37.4 lm W−1 in blue-emitting diodes, 18.6%, 49.1 cd A−1 and 47.2 lm W−1 in green-emitting diodes, and 19.1%, 59.2 cd A−1 and 66.0 lm W−1 in yellow-emitting diodes, respectively. These results corroborated the potential of phenothiazine dioxide-containing derivatives as host materials in a sequence of color TADF-OLEDs.

Graphical abstract: Phenothiazine dioxide-containing derivatives as efficient hosts for blue, green and yellow thermally activated delayed fluorescence OLEDs

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Supplementary files

Article information


Submitted
30 Oct 2019
Accepted
22 Jan 2020
First published
24 Jan 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Phenothiazine dioxide-containing derivatives as efficient hosts for blue, green and yellow thermally activated delayed fluorescence OLEDs

R. Guo, Y. Wang, Z. Huang, Q. Zhang, S. Xiang, S. Ye, W. Liu and L. Wang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05917B

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