Kadashchuk A, Vakhnin A, Blonski I, Beljonne D, Shuai Z, Brédas J L, Arkhipov V I, Heremans P, Emelianova E V, Bässler H
Institute of Physics, National Academy of Sciences of Ukraine, Prospekt Nauki 46, 03028, Kiev.
Phys Rev Lett. 2004 Aug 6;93(6):066803. doi: 10.1103/PhysRevLett.93.066803. Epub 2004 Aug 4.
The singlet-triplet splitting of geminate polaron pairs in a ladder-type conjugated polymer has been studied by the thermally stimulated luminescence technique. The energy gap separating the singlet and triplet states of the geminate pairs is measured to be in the range of 3-6 meV, depending on the polymer morphology. The results of correlated quantum-chemical calculations on a long ladder-type oligomer are fully consistent with the observed values of the geminate polaron pair singlet-triplet gap. Such low splitting values have important implications for the spin-dependent exciton formation in conjugated polymers.
通过热激发发光技术研究了梯形共轭聚合物中双极化子对的单重态-三重态分裂。根据聚合物形态，双极化子对单重态和三重态之间的能隙测量值在3-6毫电子伏特范围内。对长梯形低聚物进行的相关量子化学计算结果与双极化子对单重态-三重态能隙的观测值完全一致。如此低的分裂值对共轭聚合物中自旋相关激子的形成具有重要意义。
