Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, Canada M5S 3E4.
Science. 2011 May 20;332(6032):944-7. doi: 10.1126/science.1202992. Epub 2011 Apr 14.
In organic light-emitting diodes (OLEDs), a stack of multiple organic layers facilitates charge flow from the low work function [4.7 electron volts (eV)] of the transparent electrode (tin-doped indium oxide, ITO) to the deep energy levels (6 eV) of the active light-emitting organic materials. We demonstrate a chlorinated ITO transparent electrode with a work function of >6.1 eV that provides a direct match to the energy levels of the active light-emitting materials in state-of-the art OLEDs. A highly simplified green OLED with a maximum external quantum efficiency (EQE) of 54% and power efficiency of 230 lumens per watt using outcoupling enhancement was demonstrated, as were EQE of 50% and power efficiency of 110 lumens per watt at 10,000 candelas per square meter.
在有机发光二极管（OLED）中，多层有机材料的堆叠有助于电荷从透明电极（掺锡氧化铟，ITO）的低功函数（4.7 电子伏特（eV））流向活性发光有机材料的深能级（6 eV）。我们展示了一种具有>6.1 eV 功函数的氯化 ITO 透明电极，该电极与最先进的 OLED 中活性发光材料的能级直接匹配。采用外耦合增强技术，展示了一个高度简化的绿光 OLED，其最大外量子效率（EQE）为 54%，功率效率为 230 流明/瓦，在 10000 坎德拉/平方米时，EQE 为 50%，功率效率为 110 流明/瓦。
