【摘要】 本文报道了一类兼具超长有机磷光（UOP）和强圆偏振发光（CPL）性质的蓝光轴手性材料.这类材料不仅具有极小的单重态（S1）-三重态（T1）能隙差(ΔE_ST,0.03 eV),能够极大地促进系间窜越过程以产生更多的三重态激子,而且还具有超长的磷光衰减寿命（5.5 s）.因此,这类材料在77 K下的2-MeTHF稀溶液中显示长达60 s的亮蓝色余辉.我们进一步提出了“激子沙漏”模型来描述内部的光物理过程和解释产生超长余辉的原因.此外,由于刚性的轴手性骨架,这类UOP材料还表现出强的CPL活性,尤其是将它们用作液晶材料的手性诱导剂时,能够获得0.34的glum值.本工作对于进一步设计兼具UOP和强CPL性质的新型纯有机分子材料具有重要的指导意义.更多还原

【Abstract】 In this work,one type of axially chiral materials with both blue-emissive ultralong organic phosphorescence（UOP） and intense circularly polarized luminescence（CPL） is reported.Such materials not only exhibit extremely small energy gap between the S1 and T1 states(ΔE_ST 0.03 eV),greatly promoting the intersystem crossing process for more triplet excitons,but also show ultralong phosphorescent lifetime（5.5 s）.As a result,a bright blue afterglow of up to 60 s is achieved in 2-methyltetrahydrofuran at 77 K.The "exciton hourglass " model is further proposed to describe the internal photophysical processes.Moreover,such UOP materials also exhibit intense CPL because of the rigid axially chiral skeleton.Impressively,the luminescence asymmetry factor（glum） value of up to 0.34 can be achieved by applying them as the chiral inducers for liquid crystal materials.This work can provide a guideline and perspective for further designing novel pure organic molecules with both UOP and intense CPL.更多还原