Issue 2, 2023

Strongly polarized surface electroluminescence from an organic light-emitting transistor

Abstract

Emissive materials that radiate polarized light are in high demand for a broad variety of light-emitting electronic devices. In organic light-emitting devices—light-emitting diodes and transistors—highly polarized emission from the device surface, the surface emission, can be achieved by the in-plane co-linear orientation of molecular transition dipole moments (TDMs) in the device active layer. Furthermore, such a TDM arrangement strongly alleviates the waveguiding effect, enhancing the performance of the device. In this work, we report the first practical implementation of these ideas in an organic light-emitting transistor. Highly emissive semiconductor single crystals were grown from a thiophene–phenylene co-oligomer 1,4-bis{5-[4-(trimethylsilyl)phenyl]thiophen-2-yl}benzene (TMS-PTPTP-TMS) with trimethylsilyl (TMS) terminal substituents, which promote the in-plane TDM orientation. Organic light-emitting transistors based on TMS-PTPTP-TMS showed ambipolar charge transport with efficient electroluminescence, and the single-crystal devices demonstrated linearly polarized electroluminescence with the polarization degree of 0.78 ± 0.06. The observed polarization properties of both electro- and photoluminescence are in full agreement with the solved crystal structure and the corresponding calculations. Our findings indicate that smart control of in-plane ordered TDMs via molecular packing is a promising approach to designing materials for highly efficient light-emitting electronic devices.

Graphical abstract: Strongly polarized surface electroluminescence from an organic light-emitting transistor

Supplementary files

Article information

Article type
Research Article
Submitted
11 Okt 2022
Accepted
28 Nov 2022
First published
29 Nov 2022

Mater. Chem. Front., 2023,7, 238-248

Strongly polarized surface electroluminescence from an organic light-emitting transistor

V. A. Trukhanov, A. V. Kuevda, D. I. Dominskiy, A. L. Mannanov, T. V. Rybalova, V. A. Tafeenko, A. Yu. Sosorev, V. G. Konstantinov, M. S. Kazantsev, O. V. Borshchev, S. A. Ponomarenko, M. S. Pshenichnikov and D. Yu. Paraschuk, Mater. Chem. Front., 2023, 7, 238 DOI: 10.1039/D2QM01046A

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