%0 Journal Article %1 wong2000 %A Wong, K. S. %A Lee, C. W. %A Huang, J. D. %A Frolov, S. V. %A Vardeny, Z. V. %D 2000 %J Synthetic Metals %K ase diplom festkörper %P 497 - 500 %R 10.1016/S0379-6779(99)00430-0 %T Ultrafast stimulated emission dynamics in poly(p-phenylenevinylene) films %U http://www.sciencedirect.com/science/article/pii/S0379677999004300 %V 111-112 %X Femtosecond time-resolved studies of photoluminescence (PL) and stimulated emission (SE) have been conducted, for the first time, in neat thin films of poly(p-phenylenevinylene) derivatives. We found that the SE spectral narrowing is accompanied by a dramatic lifetime shortening from ~250 to ~3 ps, which enhances energy migration within the inhomogeneously broadened exciton distribution. In addition, the SE is delayed with respect to the PL onset by a few picoseconds depending on excitation intensity and the illumination stripe length. In some cases, a second, delayed SE is formed in the film due to the continuing energy migration into exciton states with superior radiative coupling. A set of coupled rate equations, which take into account the time-dependent exciton generation, propagation effect, optical gain and absorption loss, can simulate correctly all the observed SE dynamics.

@article{wong2000, abstract = {Femtosecond time-resolved studies of photoluminescence (PL) and stimulated emission (SE) have been conducted, for the first time, in neat thin films of poly(p-phenylenevinylene) derivatives. We found that the SE spectral narrowing is accompanied by a dramatic lifetime shortening from ~250 to ~3 ps, which enhances energy migration within the inhomogeneously broadened exciton distribution. In addition, the SE is delayed with respect to the PL onset by a few picoseconds depending on excitation intensity and the illumination stripe length. In some cases, a second, delayed SE is formed in the film due to the continuing energy migration into exciton states with superior radiative coupling. A set of coupled rate equations, which take into account the time-dependent exciton generation, propagation effect, optical gain and absorption loss, can simulate correctly all the observed SE dynamics.}, added-at = {2011-06-30T16:50:47.000+0200}, author = {Wong, K. S. and Lee, C. W. and Huang, J. D. and Frolov, S. V. and Vardeny, Z. V.}, biburl = {https://www.bibsonomy.org/bibtex/26a2af5ed76bcac5f245a95be4fcb9e8a/bkoch}, description = {ScienceDirect - Synthetic Metals : Ultrafast stimulated emission dynamics in poly(p-phenylenevinylene) films}, doi = {10.1016/S0379-6779(99)00430-0}, interhash = {af65c6c1b17159af723ca8b8971cf45a}, intrahash = {6a2af5ed76bcac5f245a95be4fcb9e8a}, issn = {0379-6779}, journal = {Synthetic Metals}, keywords = {ase diplom festkörper}, pages = {497 - 500}, timestamp = {2011-06-30T16:50:47.000+0200}, title = {Ultrafast stimulated emission dynamics in poly(p-phenylenevinylene) films}, url = {http://www.sciencedirect.com/science/article/pii/S0379677999004300}, volume = {111-112}, year = 2000 }