Efficient top-gate, ambipolar, light-emitting field-effect transistors based on a green-light-emitting polyfluorene. Organic light-emitting transistors: Materials, device configurations, and operations. Spatial control of the recombination zone in an ambipolar light-emitting organic transistor. Heterostructures based on two-dimensional layered materials and their potential applications. Organic light-emitting transistors: Advances and perspectives. Organic light-emitting transistors entering a new development stage. Optically switchable organic light-emitting transistors. The proposed structure is promising for use with electrically pumped organic lasers. In addition, the emission color can be tuned from blue to white to green-yellow using the source-drain and gate voltages. 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. 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. Here, we report a novel device configuration called the energy transfer organic light-emitting transistor (ET-OLET) that is intended to overcome these challenges. 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.
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