通过混合接触设计实现具有持续效率的高亮度有机发光场效应晶体管
Achieving Bright Organic Light Emitting Field Effect Transistors with Sustained Efficiency through Hybrid Contact Design
AI总结：
针对双层有机发光场效应晶体管电荷传输不平衡导致高亮度下效率滚降的问题，提出透明有机/无机混合接触设计，经数值模拟验证可在宽亮度、电流密度范围维持稳定外量子效率，为有机电子领域提供理想发光器件方案。
摘要：
具有双层结构的有机发光场效应晶体管（OLEFETs）因有望集成高迁移率有机晶体管与高效有机发光二极管而被广泛研究。然而，这类器件面临电荷传输不平衡的重大挑战，会导致高亮度下效率严重滚降。对此，我们提出了一种解决方案：引入一种具有特殊设计电子结构的透明有机/无机混合接触。我们的设计旨在稳定积累注入发光聚合物的电子，使发光界面即使在空穴电流增加时也能有效捕获更多空穴。数值模拟表明，这些稳定电子的捕获效率将主导电荷复合，在-4 V至-100 V电压范围内，在3个数量级的亮度（4至7700 cd/m²）和电流密度（1.2至2700 mA/cm²）区间内，实现0.23%的持续外量子效率（EQE）。即便将EQE提升至约0.51%，这种增强效果依然保持。混合接触OLEFETs提供的高且可调的亮度与稳定的效率，使其成为适用于各类应用的理想发光器件。这类器件通过攻克电荷传输不平衡这一根本挑战，有望革新有机电子领域。
英文摘要：
Organic light emitting field effect transistors (OLEFETs) with bilayer structures have been widely studied due to their potential to integrate high-mobility organic transistors and efficient organic light emitting diodes. However, these devices face a major challenge of imbalance charge transport leading to severe efficiency roll-off at high brightness. Here, we propose a solution to this challenge by introducing a transparent organic/inorganic hybrid contact with specially designed electronic structures. Our design aims to steadily accumulate the electrons injected to the emissive polymer, allowing the light emitting interface to effectively capture more holes even when hole current increases. Our numerical simulations show that the capture efficiency of these steady electrons will dominate charge recombination and lead to a sustained external quantum efficiency of 0.23% over 3 orders of magnitude of brightness (4 to 7700 cd/m2) and current density (1.2 to 2700 mA/cm2) from -4 to -100 V. The same enhancement is retained even after increasing EQE to ~0.51%. The high and tunable brightness with stable efficiency offered by hybrid-contact OLEFETs make them ideal light emitting devices for various applications. These devices have the potential to revolutionize the field of organic electronics by overcoming the fundamental challenge of imbalance charge transport.
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