Solution-Process-Feasible Deep-Red Phosphorescent Emitter

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• 作者：Jwo-Huei Jou ; Yu-Ting Su ; Ming-Ting Hsiao ; Hui-Huan Yu ; Zhe-Kai He ; Shen-Chin Fu ; Chi-Heng Chiang ; Chien-Tien Chen ; Chia-hung Chou ; Jing-Jong Shyue
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：August 25, 2016
• 年：2016
• 卷：120
• 期：33
• 页码：18794-18802
• 全文大小：568K
• 年卷期：0
• ISSN：1932-7455

文摘

Solution processing enables organic devices to be fabricated cost-effectively, while deep-red emitters enable displays with high color saturation and lighting with high light quality. However, limited deep-red emitters were reported with solution-process feasibility and high efficiency. We demonstrate here a high-efficiency, solution-process-feasible deep-red emitter by coupling the highly efficient phosphorescent complex with a highly thermally stable fluorescent compound. The device exhibits a maximum external quantum efficiency of 11.2% at 10 cd m^–2 and 8.4% at 100 cd m^–2. The latter is coupled with an ultradeep red emission (0.70, 0.27) and a potential color saturation of 108%. Besides the intrinsically high-efficiency nature of the phosphorescent complex, the record high efficiency may be attributable to the spirally configured fluorene moiety in the fluorescent compound to prevent concentration-quenching effect, a proper host to enable an effective host-to-guest energy transfer, and the employed cohost with electron-trapping character to enable a balanced carrier injection.