期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 6, 页码 5700-5705出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b17260
关键词
quantum efficiency; fluorescence; blue device; solution process; hyperfluorescence
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2016M3A7B4909243, 2016R1A2B3008845]
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.
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