溶液加工型TADF荧光/磷光混合型白光器件组装和性能研究

In view of the restriction of white OLED by high cost and short lifetime of blue phosphors, this proposal aims at design and fabrication of solution-processed hybrid white OLED based on TADF blue emitters and yellow phosphors. The key is to use interfacial exciplex as the host for TADF blue emitter to develop low driving-voltage and high power-efficiency hybrid white device. The design and fabrication of two kinds of devices will be developed: one is to achieve low driving-voltage blue TADF device and high power-efficiency hybrid white device by developing high triplet-energy-level interfacial exciplex hosts suitable for TADF blue emitter; the other is to achieve solution-processed multi-layer hybrid white device through orthogonal-solvent method by using alcohol-resisting dendritic TADF blue emitter and alcohol-soluble yellow phosphors. With the achievement of low driving voltage (<3.0 V) and high power efficiency (80～100 lm/W) for solution-processed white OLED, we believe this study will provide innovative approaches for the development of white OLED with application perspective.

针对白光OLED器件应用面临成本偏高和蓝光磷光材料寿命较短的限制，本申请围绕溶液加工型TADF荧光/磷光混合型白光器件开展材料设计和器件组装。特色是采用界面型激基复合物作为蓝光TADF材料的主体，利用其低驱动电压的优势，发展高功率效率的溶液加工荧光/磷光混合型白光器件。重点围绕两类器件开展研究，其一是面向高功率效率的白光器件，发展适用于蓝光TADF材料的高三线态能级界面型激基复合物主体，组装具有低驱动电压特性的TADF蓝光荧光器件和荧光/磷光混合型白光器件；其二是面向溶液加工多层结构的白光器件，采用具有耐醇溶剂侵蚀特性的树枝状TADF蓝光材料和醇溶性黄光磷光染料，结合正交溶剂法组装具有多层结构的荧光/磷光混合型白光器件。力争实现溶液加工型白光器件驱动电压的显著降低（<3.0V）和功率效率的突破（80～100lm/W），为发展具有应用潜力的低成本白光器件提供研究基础和创新思路。

传统贵金属蓝光磷光材料价格高且寿命较短是制约白光OLED产业应用的瓶颈问题。因此，本项目围绕溶液加工型TADF荧光（蓝光）/磷光（黄光）混合型白光器件开展材料开发和器件组装，发展了适用于蓝光TADF材料的高三线态能级（>2.8 eV）界面型激基复合物主体，开发出高效率蓝绿光TADF高分子，实现了低驱动电压（启亮电压2.8 V）和高功率效率（80.0 lm/W）的溶液加工型TADF荧光/磷光混合白光器件的组装，同时利用正交溶剂工艺成功组装出具有溶液加工多层结构的白光器件。此外，本项目还探索了溶液加工型全TADF型白光器件的组装，并实现其效率的突破，为下一步开发完全不需要贵金属的全有机溶液加工型白光器件奠定了基础。