Herein we disclose a series of purely organic molecules (1–4) with a donor‐acceptor architecture (phenothiazine donor (D) and the acyl acceptor (A)) exhibiting room temperature dual phosphorescence (RTDP) characteristics. Detailed computational and photophysical studies revealed that the dual RTP bands with different wavelengths and lifetimes in these compounds originate from excited triplet states of different energies. In particular, the electronic nature of the substituent on the acceptor acyl unit has a significant effect on the energy of the ICT state, hybridization of excited states, as well as the rate of intersystem crossing. Compound 1 with an electron‐deficient CF₃−CO acceptor moiety exhibit RTDP in the longer wavelength region. In contrast, compounds 2, 3 and 4 with weaker acceptors (2; CH₃−CO, 3; CH₃−CH₂−CO and 4; (CH₃)₂−CH−CO) exhibit RTDP in a shorter wavelength region.

中文翻译：

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室温磷光（RTP）N-乙酰基吩噻嗪

本文我们公开了一系列纯有机分子（的1 - 4）与供体-受体架构（吩噻嗪给体（d）和所述酰基受体（A））表现出室温双磷光（RTDP）特性。详细的计算和光物理研究表明，这些化合物中具有不同波长和寿命的双RTP谱带源自不同能量的激发三重态。特别地，受体酰基单元上的取代基的电子性质对ICT状态的能量，激发态的杂化以及系统间交叉的速率具有重要影响。化合物1具有电子不足的CF ₃-CO受体部分在更长的波长区域内显示RTDP。与此相反，化合物2，3和4具有较弱受体（2 ; CH ₃ -CO，3 ; CH ₃ -CH ₂ -CO和4 ;（CH ₃）₂ -CH-CO）表现出在RTDP较短波长区域。