ITO-free top emitting organic light emitting diodes with enhanced light out-coupling
ITO-free top emitting organic light emitting diodes with enhanced light out-coupling
复制标题
DOI：
10.1002/lpor.201300148
复制
发表时间：
2014-01-01
影响因子：
11
通讯作者：
Namdas, Ebinazar B.
中科院分区：
文献类型：
--
作者：
Yambem, Soniya D.;Ullah, Mujeeb;Namdas, Ebinazar B.
底部发射有机发光二极管（OLED）可能由于所产生的光的低效外耦合而遭受较低的外部量子效率（EQE）。在此，证明了当MoOx（5 nm）/Ag（10 nm）/MoOx（40 nm）叠层用作顶部发射OLED结构中的透明阳极时，红色、黄色和蓝色荧光单层聚合物OLED的电流效率和EQE显著增强。黄色OLED的最大电流效率和EQE分别为21.2 cd/A和6.7%，而蓝色OLED的最大电流效率和EQE分别为16.5 cd/A和10.1%。相对于优化的底部发射器件，顶部发射OLED的光输出耦合的增加导致效率增加高达2.2倍，这是在简单架构中使用溶液处理的聚合物报告的最佳输出耦合，并且是它们在大面积照明和显示器中使用的重要一步。
Bottom emitting organic light emitting diodes (OLEDs) can suffer from lower external quantum efficiencies (EQE) due to inefficient out-coupling of the generated light. Herein, it is demonstrated that the current efficiency and EQE of red, yellow, and blue fluorescent single layer polymer OLEDs is significantly enhanced when a MoOx(5 nm)/Ag(10 nm)/MoOx(40 nm) stack is used as the transparent anode in a top emitting OLED structure. A maximum current efficiency and EQE of 21.2 cd/A and 6.7%, respectively, was achieved for a yellow OLED, while a blue OLED achieved a maximum of 16.5 cd/A and 10.1%, respectively. The increase in light out-coupling from the top-emitting OLEDs led to increase in efficiency by a factor of up to 2.2 relative to the optimised bottom emitting devices, which is the best out-coupling reported using solution processed polymers in a simple architecture and a significant step forward for their use in large area lighting and displays.