Hu Yongsheng, Lin Jie, Song Li, Lu Qipeng, Zhu Wanbin, Liu Xingyuan
State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
State Key Laboratory of Applied Optics, Chinese Academy of Sciences, Changchun 130033, China.
Sci Rep. 2016 Mar 17;6:23210. doi: 10.1038/srep23210.
Organic light-emitting field-effect transistors (OLEFETs) are regarded as a novel kind of device architecture for fulfilling electrical-pumped organic lasers. However, the realization of OLEFETs with high external quantum efficiency (EQE) and high brightness simultaneously is still a tough task. Moreover, the design of the resonator structure in LED is far from satisfactory. Here, OLEFETs with EQE of 1.5% at the brightness of 2600 cdm(-2), and the corresponding ON/OFF ratio and current efficiency reaches above 10(4) and 3.1 cdA(-1), respectively, were achieved by introducing 1,4,5,8,9,12-hexaazatriphenylene-hexacarbonitrile (HAT-CN) as a charge generation layer. Moreover, a vertical microcavity based on distributed Bragg reflector (DBR) and Ag source/drain electrodes is successfully introduced into the high performance OLEFETs, which results in electroluminescent spectrum linewidth narrowing from 96 nm to 6.9 nm. The results manifest the superiority of the vertical microcavity as an optical resonator in OLEFETs, which sheds some light on achieving the electrically pumped organic lasers.
有机发光场效应晶体管（OLEFETs）被视为实现电泵浦有机激光器的一种新型器件架构。然而，同时实现具有高外部量子效率（EQE）和高亮度的OLEFETs仍然是一项艰巨的任务。此外，发光二极管中谐振器结构的设计也远不能令人满意。在此，通过引入1,4,5,8,9,12 - 六氮杂三亚苯 - 六腈（HAT - CN）作为电荷产生层，实现了在亮度为2600 cdm⁻²时EQE为1.5%的OLEFETs，其相应的开/关比和电流效率分别达到10⁴以上和3.1 cdA⁻¹。此外，一种基于分布式布拉格反射器（DBR）和银源/漏电极的垂直微腔被成功引入到高性能OLEFETs中，这使得电致发光光谱线宽从96 nm窄化到6.9 nm。结果表明垂直微腔作为OLEFETs中的光学谐振器具有优越性，这为实现电泵浦有机激光器提供了一些启示。
