Department of Electrical & Computer Engineering and Waterloo Institute for Nanotechnology (WIN) and †Department of Chemistry, University of Waterloo , 200 University Avenue West, Waterloo, Ontario N2G 3G1, Canada.
ACS Appl Mater Interfaces. 2017 Nov 22;9(46):40564-40572. doi: 10.1021/acsami.7b15190. Epub 2017 Nov 10.
We investigate and compare between organic light-emitting devices (OLEDs) fabricated by solution-coating versus vacuum-deposition. Electroluminescence, photoluminescence, and chromatographic measurements on typical OLED host materials reveal significant electromer formation in layers fabricated by solution-processing, pointing to stronger intermolecular interactions in these systems. Delayed electroluminescence measurements reveal that solution-processed layers also have increased charge traps. The findings provide insights on the morphological differences between solution-processed and vacuum-deposited materials and shed light on the root causes behind the lower electroluminescence stability of solution-processed OLEDs.
我们研究并比较了溶液涂覆和真空沉积制备的有机发光器件（OLED）。对典型 OLED 主体材料的电致发光、光致发光和色谱测量表明，溶液处理制备的层中存在显著的电偶极子形成，表明这些体系中存在更强的分子间相互作用。延迟电致发光测量表明，溶液处理的层也具有增加的电荷陷阱。这些发现提供了对溶液处理和真空沉积材料之间形态差异的深入了解，并揭示了溶液处理 OLED 电致发光稳定性较低的根本原因。
