A new two-photon material, 3E,6E-bis（2-pyrid-4′-ylvinyl）dibenzothiophene （BPVDBT）, has been firstly synthesized by an efficient Pd-catalyzed Heck coupling route. The single- and two-photon fluorescence, quantum y...A new two-photon material, 3E,6E-bis（2-pyrid-4′-ylvinyl）dibenzothiophene （BPVDBT）, has been firstly synthesized by an efficient Pd-catalyzed Heck coupling route. The single- and two-photon fluorescence, quantum yields, lifetimes, solvent effects of the chromophore were studied in detail and the compound exhibited solvent-sensitivity. The fluorescence intensity （Ⅰout） and input excitation intensity （Ⅰin） can fit in well with the quadratic parabolas, which indicates that the up-converted fluorescence was induced by the two-photon absorption （TPA）. TPA cross-section of BPVDBT has been measured using the two-photon-induced fluorescence method, whose value is 14.24×10^-50 cm^4·s·photon^-1·molecule^-1 at 750 nm. The experimental results confirm that BPVDBT is a good two-photon absorbing chromophore with an A-π-A type.展开更多
基金Project supported by the State Key Program of China （No. 2004CB719803）, the National Natural Science Foundation of China （Nos. 50673053, NSFC/RGC50218001, 50173015, 60377041）.
文摘A new two-photon material, 3E,6E-bis（2-pyrid-4′-ylvinyl）dibenzothiophene （BPVDBT）, has been firstly synthesized by an efficient Pd-catalyzed Heck coupling route. The single- and two-photon fluorescence, quantum yields, lifetimes, solvent effects of the chromophore were studied in detail and the compound exhibited solvent-sensitivity. The fluorescence intensity （Ⅰout） and input excitation intensity （Ⅰin） can fit in well with the quadratic parabolas, which indicates that the up-converted fluorescence was induced by the two-photon absorption （TPA）. TPA cross-section of BPVDBT has been measured using the two-photon-induced fluorescence method, whose value is 14.24×10^-50 cm^4·s·photon^-1·molecule^-1 at 750 nm. The experimental results confirm that BPVDBT is a good two-photon absorbing chromophore with an A-π-A type.
