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Prediction of excitation energies for conjugated polymers using time-dependent density functional theory

机译:使用时变密度泛函理论预测共轭聚合物的激发能

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Excitation energies of light-emitting conjugated polymers have been investigated with time-dependent density functional theory (TDDFT) within the adiabatic approximation. Our calculations show that the accuracy of the calculated TDDFT excitation energies largely depends on the dihedral angles obtained by the ground-state DFT geometry optimization. We find that, when the DFT torsional dihedral angles are close to experimental estimates, the TDDFT excitation energies agree well with experiments. This trend is observed based on calculations of eight different polymeric systems considered here. We further show that while hybrid density functionals can respect the thumb rule of E_T≈2E_S/3, where E_S is the singlet-singlet excitation energy and E_T the singlet-triplet excitation energy, nonhybrid functionals do not.
机译:发光共轭聚合物的激发能已在绝热近似中使用时变密度泛函理论(TDDFT)进行了研究。我们的计算表明,计算出的TDDFT激发能的精度很大程度上取决于通过基态DFT几何优化获得的二面角。我们发现,当DFT扭转二面角接近实验估计值时,TDDFT激发能与实验很好地吻合。基于此处考虑的八种不同聚合物体系的计算,可以观察到这种趋势。我们进一步证明,虽然混合密度泛函可以遵循E_T≈2E_S/ 3的经验法则,其中E_S是单重态-单重态激发能,E_T是单重态-三重态激发能,但非混合函数则不然。

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