Romanovskii Y V, Gerhard A, Schweitzer B, Scherf U, Personov R I, Bassler H
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow region, 142092 Russian Federation.
Phys Rev Lett. 2000 Jan 31;84(5):1027-30. doi: 10.1103/PhysRevLett.84.1027.
We observed phosphorescence from a ladder-type poly-(para-phenylene) and an analogous oligomer containing five phenylene rings. The spectra are similar to the intrinsic fluorescence spectra and bear out a singlet-triplet splitting of 5000 cm(-1) (polymer) and 6800 cm(-1) (oligomer). Phosphorescence decay of the polymer occurs on a 10-100-micros scale obeying a power law and suggestive of nonradiative quenching, while that of the oligomer is asymptotically exponential with an intrinsic decay time of approximately 250 ms. The polymer also exhibits delayed fluorescence. It originates from delayed recombination of geminate electron-hole pairs rather than from triplet-triplet annihilation.
我们观察到一种梯形聚对亚苯基和一种含有五个苯环的类似低聚物发出磷光。其光谱与本征荧光光谱相似，证实聚合物的单重态 - 三重态分裂为5000 cm⁻¹，低聚物为6800 cm⁻¹。聚合物的磷光衰减发生在10 - 100微秒尺度上，遵循幂律，表明存在非辐射猝灭，而低聚物的磷光衰减是渐近指数型的，本征衰减时间约为250毫秒。该聚合物还表现出延迟荧光。它源于双生电子 - 空穴对的延迟复合，而非三重态 - 三重态湮灭。
