School of Chemical Engineering, Sungkyunkwan University , 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Korea.
ACS Appl Mater Interfaces. 2018 Feb 14;10(6):5700-5705. doi: 10.1021/acsami.7b17260. Epub 2018 Jan 30.
Solution-processed high-efficiency fluorescent organic light-emitting diodes with an external quantum efficiency over 18% were developed by engineering a host material and device structure designed for solution process. A high triplet energy host material designed for the solution process, (oxybis(3-(tert-butyl)-6,1-phenylene))bis(diphenylphosphine oxide) (DPOBBPE), worked efficiently as the host of blue fluorescent devices because of good solubility, high photoluminescence quantum yield, and good film properties. The DPOBBPE host enabled a high external quantum efficiency of 18.8% in the fluorescent organic light-emitting diodes by the solution process. Moreover, 25.8% external quantum efficiency in the soluble blue thermally activated delayed fluorescent devices was also realized. The 25.8% external quantum efficiency of the DPOBBPE delayed fluorescent device and 18.8% external quantum efficiency of the fluorescent device are the highest efficiency values achieved in the solution-processed blue fluorescent organic light-emitting diodes. Moreover, the solution-processed fluorescent device showed an improved blue color coordinate of (0.14, 0.20) compared to (0.17, 0.31) of the delayed fluorescent device.
通过工程化用于溶液处理的主体材料和器件结构，开发了一种具有超过 18%外量子效率的溶液处理高效荧光有机发光二极管。一种用于溶液处理的高三重态能量主体材料，（氧双（3-（叔丁基）-6,1-亚苯基））双（二苯基膦氧化物）（DPOBBPE），由于良好的溶解性、高光致发光量子产率和良好的薄膜性能，作为蓝色荧光器件的主体材料表现出高效率。通过溶液处理，DPOBBPE 主体使荧光有机发光二极管的外量子效率达到 18.8%。此外，还实现了可溶性蓝色热激活延迟荧光器件 25.8%的外量子效率。DPOBBPE 延迟荧光器件的 25.8%外量子效率和荧光器件的 18.8%外量子效率是溶液处理蓝色荧光有机发光二极管中达到的最高效率值。此外，与延迟荧光器件的（0.17，0.31）相比，溶液处理的荧光器件的蓝色色坐标得到了改善，为（0.14，0.20）。
