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An Organic Light-Emitting Diode with Field-Effect Electron Transport

机译：具有场效应电子传输的有机发光二极管

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摘要

We describe an organic light-emitting diode (OLED) using field-effect to transport electrons. The device is a hybrid between a diode and a field-effect transistor. Compared to conventional OLEDs, the metallic cathode is displaced by one to several micrometers from the light-emitting zone. This micrometer-sized distance can be bridged by electrons with enhanced field-effect mobility. The device is fabricated using poly(triarylamine) (PTAA) as the hole-transport material, tris(8-hydroxyquinoline) aluminum (Alq_3) doped with 4-(dicyanomethylene)-2-methyl-6-(julolindin-4-yl-vinyl)-4H-pyran (DCM_2) as the active light-emitting layer, and N,N'-ditridecylperylene-3,4,9,l0-tetracarboxylic diimide (PTCDI-C_(13)H_(27)). as the electron-transport material. The obtained external quantum efficiencies are as high as for conventional OLEDs comprising the same materials. The quantum efficiencies of the new devices are remarkably independent of the current, up to current densities of more than 10 A cm~(-2). In addition, the absence of a metallic cathode covering the light-emission zone permits top-emission and could reduce optical absorption losses in waveguide structures. These properties may be useful in the future for the fabrication of solid-state high-brightness organic light sources.
机译：我们描述了一种利用场效应传输电子的有机发光二极管（OLED）。该器件是二极管和场效应晶体管之间的混合体。与传统的OLED相比，金属阴极距发光区的距离为一到几微米。微米大小的距离可以通过电子来增强场效应迁移率。该器件是使用聚三芳基胺（PTAA）作为空穴传输材料，掺杂有4-（二氰基亚甲基）-2-甲基-6-（julolindin-4-yl-）的三（8-羟基喹啉）铝（Alq_3）制成的。乙烯基）-4H-吡喃（DCM_2）作为活性发光层，以及N，N'-二十三烷基per-3,4,9,10-四羧酸二酰亚胺（PTCDI-C_（13）H_（27））。作为电子传输材料。所获得的外部量子效率与包含相同材料的常规OLED一样高。新器件的量子效率明显独立于电流，直至电流密度超过10 A cm〜（-2）。另外，不存在覆盖发光区的金属阴极允许顶部发射并且可以减少波导结构中的光吸收损耗。这些特性在将来可能用于制造固态高亮度有机光源。

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