Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
Adv Mater. 2023 Jun;35(26):e2300574. doi: 10.1002/adma.202300574. Epub 2023 May 8.
Efficient organic light-emitting diodes (OLEDs) commonly comprise a multilayer stack including charge-transport and charge- and exciton-blocking layers, to confine charge recombination to the emissive layer. Here, a highly simplified single-layer blue-emitting OLED is demonstrated based on thermally activated delayed fluorescence with the emitting layer simply sandwiched between ohmic contacts consisting of a polymeric conducting anode and a metal cathode. The single-layer OLED exhibits an external quantum efficiency of 27.7% with minor roll-off at high brightness. The internal quantum efficiency approaches unity, demonstrating that highly simplified single-layer OLEDs without confinement layers can achieve state-of-the-art performance, while greatly reducing the complexity of the design, fabrication, and device analysis.
高效的有机发光二极管（OLED）通常包括一个多层堆叠结构，其中包括电荷传输层和电荷和激子阻挡层，以将电荷复合限制在发射层中。在这里，我们展示了一种高度简化的单层蓝色发射 OLED，它基于热激活延迟荧光，其发射层简单地夹在欧姆接触层之间，欧姆接触层由聚合物导电阳极和金属阴极组成。该单层 OLED 的外量子效率为 27.7%，在高亮度下略有下降。内部量子效率接近 1，表明没有限制层的高度简化单层 OLED 可以实现最先进的性能，同时大大降低设计、制造和器件分析的复杂性。
