摘要
Three two-photon absorption （TPA） tribranched chromophores were successfully prepared, in which 1,3,5-triazine is been as electron deficient core, 1,4-phenylenedivinylene as conjugated bridge, 3,4-ethylenedioxy- thiophene （EDOT） （T1）, N-methylpyrrole （T2） or triphenylamine （T3） as electron-donating end-groups. Their pho- tophysical properties were studied by absorption, one- and two-photon fluorescence and TPA cross-section deter- mination. The nonlinear transmission （NLT） measurement in femtoseconds （fs） regime at 800 nm indicates that TPA cross-section σ2 values of T1, T2 and T3 with extended π-conjugated bridge are much larger than the corresponding chromophore T4 with a short length bridge, and TPA cross-section of T1 with end-groups EDOT exhibits a remarkable enhancement compared with T2 and T3 having the same length It-system. The chromophores T1, T2 and T3 show also remarkable up-converted luminescence and optical limiting activity.
Three two-photon absorption （TPA） tribranched chromophores were successfully prepared, in which 1,3,5-triazine is been as electron deficient core, 1,4-phenylenedivinylene as conjugated bridge, 3,4-ethylenedioxy- thiophene （EDOT） （T1）, N-methylpyrrole （T2） or triphenylamine （T3） as electron-donating end-groups. Their pho- tophysical properties were studied by absorption, one- and two-photon fluorescence and TPA cross-section deter- mination. The nonlinear transmission （NLT） measurement in femtoseconds （fs） regime at 800 nm indicates that TPA cross-section σ2 values of T1, T2 and T3 with extended π-conjugated bridge are much larger than the corresponding chromophore T4 with a short length bridge, and TPA cross-section of T1 with end-groups EDOT exhibits a remarkable enhancement compared with T2 and T3 having the same length It-system. The chromophores T1, T2 and T3 show also remarkable up-converted luminescence and optical limiting activity.
基金
Project supported by the National Natural Science Foundation of China （No. 20774039） and the National Basic Research （No. 2007CB925103）.
