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Issue 25, 2018
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Blue-shifted emission color and high quantum efficiency in solution-processed blue thermally activated delayed fluorescence organic light-emitting diodes using an intermolecular interaction suppressing host decorated with blocking groups

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Abstract

A high triplet energy material with the ability to suppress intermolecular interactions was synthesized as a host for a blue thermally activated delayed fluorescence (TADF) emitter for blue-shifted emission color and high quantum efficiency in solution-processed TADF organic light-emitting diodes. The host material, (5-(tert-butyl)-2-(4-(tert-butyl)phenoxy)phenyl)diphenylphosphine oxide (POBBPE), was designed to have a phenoxyphenyl core structure for high triplet energy, a diphenylphosphine oxide group for electron transport, and two tert-butyl units to prevent intermolecular interaction. Solution-processed blue TADF devices were developed using the POBBPE host and 2,3,4,5,6-penta(9H-carbazol-9-yl)benzonitrile (5CzCN) as the emitter, and a high quantum efficiency of 23.3% was achieved. In particular, the color coordinates of the solution-processed POBBPE:5CzCN devices were (0.16, 0.23), which were significantly blue-shifted compared to the color coordinates of (0.17, 0.31) from a previous 5CzCN device fabricated using a well-known bis[2-(diphenylphosphino)phenyl]ether oxide host.

Graphical abstract: Blue-shifted emission color and high quantum efficiency in solution-processed blue thermally activated delayed fluorescence organic light-emitting diodes using an intermolecular interaction suppressing host decorated with blocking groups

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Publication details

The article was received on 28 Apr 2018, accepted on 08 Jun 2018 and first published on 08 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC02050G
Citation: J. Mater. Chem. C, 2018,6, 6778-6783
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    Blue-shifted emission color and high quantum efficiency in solution-processed blue thermally activated delayed fluorescence organic light-emitting diodes using an intermolecular interaction suppressing host decorated with blocking groups

    S. K. Jeon, H. Park and J. Y. Lee, J. Mater. Chem. C, 2018, 6, 6778
    DOI: 10.1039/C8TC02050G

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