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Planarized intramolecular charge transfer on triphenylamine-modified pyrazine and its application in organic light-emitting diodes

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Abstract

Excellent luminescence and transportation are the most essential features of organic light-emitting diodes (OLEDs); however, many D–A type materials usually facilitate charge transport but have poor luminescence properties. Herein, we designed two triphenylamine-pyrazine compounds, namely 25-TPA2P and 26-TPA2P, with planarized intramolecular charge transfer character to overcome this problem. Both single crystal XRD and computational analysis show an asymmetric configuration for 26-TPA2P, which furnishes 26-TPA2P with relatively strong ICT and better charge transport balance, as compared with the symmetric 25-TPA2P. A non-doped device containing 25-TPA2P displays sky-blue electroluminescence with a maximum external quantum efficiency (ηext) of 6.09%, by virtue of its strong emission in the solid state and its orientation; for 26-TPA2P, a deep blue OLED with a CIEy of 0.07 and ηext of 4.88% is achieved. Thanks to the balanced transport ability of 26-TPA2P, a series of high efficiency orange/red phosphorescent OLEDs and two-color hybrid WOLEDs are obtained based on 26-TPA2P as the host material. The ηext of the orange OLED exceeds 28%, and the warm-white OLED exhibits a total ηext of 30.11%. These results suggest that PLICT materials could satisfy both conditions of good charge transportation and luminescence, which could bring about bright prospects for displays and illuminations.

Graphical abstract: Planarized intramolecular charge transfer on triphenylamine-modified pyrazine and its application in organic light-emitting diodes

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Supplementary files

Article information


Submitted
06 Feb 2020
Accepted
26 Feb 2020
First published
27 Feb 2020

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

Planarized intramolecular charge transfer on triphenylamine-modified pyrazine and its application in organic light-emitting diodes

B. Zhang, H. Wu, Z. Wang, A. Qin and B. Z. Tang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC00626B

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