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不能这样说, 一般说来是两个态之间的跃迁特征差异越大,它们之间的SOC就越强。 比如<CT|SOC|CT>就往往很小,<CT|SOC|LE>往往就比较大。关于这个问题,Acc. Chem. Res. 2018, 51, 2215−2224这篇TADF的综述文章中是这样讲的:“In twisted CT-type TADF emitters in which the S1 and T1
states both show a substantial CT-excitation character, the positive outcome is a small ΔEST; however, a drawback is that the spin−orbit coupling between these excited states tends to vanish.10 The main reason is that, within the one-electron approximation, the spin−orbit operator acts on both the spin magnetic quantum number of the electron and its spatial angular momentum quantum number. Consequently, spin− orbit couplings between singlet and triplet states with the same spatial orbital occupation are formally zero, as any change in spin cannot be compensated by a corresponding change in orbital angular momentum and thus the total angular momentum would not be conserved. ” 大概意思就是说,要保证总的角动量守恒,这里以S1与T1为例,那么就必须要保证S1与T1具有不同的跃迁特征(按照这里的说法即具有不同的轨道角动量),此时它们之间的SOC才比较大。 |
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