The synthesis and optical properties of three stilbene-type dyes

摘要

Three"D-pi-A"stilbene-type dyes,namely trans-4-[p-(N,N-di(2-hydroxyethyl))-amino-styryl]-N-methyl pyridinium iodide(DHEASPI-C1),trans-4-[p-(N,N-di(2-hydroxyethyl))-amino-styryl]-N-octyl pyridinium bromide(DHEASPBr-C8)and trans-4-[p-(N,N-di(2-hydroxyethyl))-amino-styryl]-N-dodecyl pyridinium bromide(DHEASPBr-C12)were synthesized and their optical properties in different environments were investigated.Red shifts occurred in both the one-photon and two-photon fluorescence spectra from DHEASPI-Ci to DHEASPBr-Cg and to DHEASPBr-C12 as the alkyl group in the terminal acceptor was changed from methyl through octyl to dodecyl.When a 1064 nm,<130 fs mode-locked Nd:YAG laser pulse was pumped,their lasing locations occurred at 613-624 nm.When DHEASPI-C1 was used as reference,the two-photon absorption cross-sections(sigma_s)of DHEASPBr-C8 and DHEASPBr-C12 were 8.02 and 13.5,respectively.