Issue 14, 2020

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

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

Supplementary files

Article information

Article type
Paper
Submitted
06 Feb 2020
Accepted
26 Feb 2020
First published
27 Feb 2020

J. Mater. Chem. C, 2020,8, 4754-4762

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, 8, 4754 DOI: 10.1039/D0TC00626B

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