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Research Article

Efficient energy transfer in organic light-emitting transistor with tunable wavelength

Ke Zhou1, Jian Tang1, Shaofan Fang1, Ke Jiang1, Fangxu Yang2, Deyang Ji2, Jing Xiang1,3, Jie Liu4, Huanli Dong4( ), Cheng Han1, Hanlin Hu3, Xiaotao Zhang2, Wenping Hu2,5( ), Yumeng Shi1( )
International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Sciences, Tianjin University, Tianjin 300072, China
Hoffman Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 518060, China
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China
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Graphical Abstract

Here, we report a novel device configuration called the energy transfer organic light-emitting transistor (ET-OLET). The ET-OLET can separate its charge transport layer and its emissive layer, leading to high efficiency and tuning of the light emission color by adjusting the doping concentration, gate voltage, or source-drain voltage.

Abstract

Key challenges in the development of organic light-emitting transistors (OLETs) are blocking both scientific research and practical applications of these devices, e.g., the absence of high-mobility emissive organic semiconductor materials, low device efficiency, and color tunability. Here, we report a novel device configuration called the energy transfer organic light-emitting transistor (ET-OLET) that is intended to overcome these challenges. An organic fluorescent dye-doped polymethyl methacrylate (PMMA) layer is inserted below the conventional high-mobility organic semiconductor layer in a single-component OLET to separate the functions of the charge transport and light-emitting layers, thus making the challenge to essentially integrate the high mobility and emissive functions within a single organic semiconductor in a conventional OLET or multilayer OLET unnecessary. In this architecture, there is little change in mobility, but the external quantum efficiency (EQE) of the ET-OLET is more than six times that of the conventional OLET because of the efficient Förster resonance energy transfer, which avoids exciton-charge annihilation. In addition, the emission color can be tuned from blue to white to green-yellow using the source-drain and gate voltages. The proposed structure is promising for use with electrically pumped organic lasers.

Keywords

color tunabilityenergy transferorganic light-emitting transistor (OLET)Förster resonance energy transfer (FRET)

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Nano Research
Volume 15 Issue 4,
April 2022
Pages 3647-3652
DOI: 10.1007/s12274-021-3959-x
Cite this article:
Zhou K, Tang J, Fang S, et al. Efficient energy transfer in organic light-emitting transistor with tunable wavelength. Nano Research, 2022, 15(4): 3647-3652. https://doi.org/10.1007/s12274-021-3959-x
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Received: 30 August 2021
Revised: 20 October 2021
Accepted: 29 October 2021
Published: 06 December 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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