In this work, vacuum-evaporated Ag-island nanostructures were incorporated into the electron transporting layer (ETL) and their effects on the performance of non-doped blue phosphorescent organic light-emitting devices (PhOLEDs) using an ultrathin phosphorescent dye as the emitting layer (EML) were investigated systematically. By changing the thickness and deposition rate of Ag layer, the surface morphologies and resonance absorption spectra of the Ag-island nanostructures can be fine modulated. The device performance is significantly dependent on the structure and position of Ag layer. The experimental results indicate that 0.5 nm Ag layer deposited at a rate of 0.06 Å/s presents excellent spectral overlap between the resonance absorption spectra of Ag-island layer and the emission spectra of EML that impacts the electrical properties. Compared to the reference device without Ag-island layer, the current efficiency of the optimized device was enhanced by 54% from 15.1 cd/A to 23.2 cd/A when 0.5 nm Ag-island layer was incorporated into ETL with 20 nm away from EML. The performance enhancement is attributed to the synergistic effects for the improved electron transport properties induced by the Ag-island layer and the effective couplings between excitons and localized surface plasmons (LSPs).

在这项工作中，真空蒸发的银岛纳米结构被并入电子传输层（ETL）中，并且它们对使用超薄磷光染料作为发光层的非掺杂蓝色磷光有机发光器件（PhOLED）的性能产生了影响。 （EML）进行了系统的调查。通过改变银层的厚度和沉积速率，可以对银岛纳米结构的表面形貌和共振吸收光谱进行精细调制。器件性能在很大程度上取决于Ag层的结构和位置。实验结果表明，以0.06Å/ s的速率沉积的0.5 nm Ag层在Ag-island层的共振吸收光谱与EML的发射光谱之间有极好的光谱重叠，从而影响了电性能。与没有Ag-island层的参考器件相比，当将0.5 nm Ag-island层合并到ETL中且与EML距离为20 nm时，优化器件的电流效率从15.1 cd / A提高到23.2 cd / A，提高了54％。 。性能的提高归因于银岛层诱导的电子传输性能的改善以及激子与局部表面等离激元之间的有效耦合所产生的协同效应。