摘要：Thermally activated delayed fluorescence(TADF)molecules have outstanding potential for applications in organic light-emitting diodes(OLEDs).Due to the lack of systematic studies on the correlation between molecular structure and luminescence properties,TADF molecules are far from meeting the needs of practical applications in terms of variety and *** this paper,three twisted TADF molecules are studied and their photophysical properties are theoretically predicted based on the thermal vibrational correlation function method combined with multiscale *** results show that all the molecules exhibit fast reverse intersystem crossing(RISC)rates(kRISC),predicting their TADF luminescence *** addition,the binding of DHPAzSi as the donor unit with different acceptors can change the dihedral angle between the ground and excited states,and the planarity of the acceptors is positively correlated with the reorganization energy,a property that has a strong influence on the non-radiative ***,a decrease in the energy of the molecular charge transfer state and an increase in the kRISC were observed in the *** study not only provides a reliable explanation for the observed experimental results,but also offers valuable insights that can guide the design of future TADF molecules.

摘要：中国的古文字是一种图形文字,在长期的使用过程中逐渐形成了其独特的造字精神。研究古文字的造字精神对现代视觉传达设计有一定的借鉴作用,本文通过大量案例对此进行了详细阐述。

摘要：蓝光OLED材料是电致发光领域的关键和难点。基于高能激发态转换的“热激子”材料表现出优异蓝光材料的潜能。本文通过调节给受体的推拉电子能力,以蒽为核心构筑单元、三苯基苯为弱给体、苯氰基为受体,设计合成了一种新型D-π-A结构分子TACN。扭曲的三苯基苯提供了高度扭曲的分子构象,有效减弱了聚集态下的猝灭效应,因此TACN表现出高的荧光量子产率(聚集态下47%)。实验结果和理论分析表明,TACN具备“热激子”特征,其大的T_(2)-T_(1)能隙(1.45 eV)有效阻碍了从T_(2)到T_(1)的内转换(IC)过程,而小的T_(2)-S_(1)能差(0.18 eV,T_(2)>S_(1))有利于促进反向系间窜越(RISC)过程。基于TACN的非掺杂器件表现出深蓝色发射(λmax=444 nm),半峰宽(FWHM)为59 nm,色坐标为(0.17,0.13)。其最大外量子效率(EQEmax)为8.3%,相应的激子利用率(EUE)最高为88.7%。

摘要：既有研究表明街道中心性在社区层面的土地利用格局中发挥着至关重要的作用。但在多中心条件下,这种关联性可能会减弱。因此以深圳为研究案例,使用扩展空间句法测算不同半径下的街道中心性。由兴趣点数据反映运动休闲设施的空间分布,通过核密度估计法在ArcGIS中将要素转化为同一栅格数据集,并分析不同类型的运动休闲设施空间分布与街道中心性的联系。通过空间自相关分析来探索街道中心性与运动休闲设施空间分布的耦合关系。结果表明:(1)街道中心性对于公益性运动休闲设施的分布具有吸引力,但这种吸引力可能由于功能种类、服务半径、地理条件、历史人文要素等因素产生波动,增强或减弱至不显著状态。(2)街道中心性的接近性和中间性两种指标,对于不同种类运动休闲设施的空间分布有着不同程度的吸引力。(3)街道中间性对于运动休闲设施空间分布的吸引力需要街道接近性的支持才能够显现。(4)目前深圳的商业性运动休闲设施呈现出大型化、外迁化的特点,这是城市活力衰减的标志。