| abstract |
A two-photon absorption material which consists of at least one member selected from the group consisting of compounds represented by the general formulae (1) and (2) and which exhibits a two-photon absorption peak wavelength in a wavelength region within 250nm from the one-photon absorption peak wavelength and has a great two-photon absorption cross-section: (1) (2) wherein R1 and R2 are each independently hydrogen or alkoxy of 1 to 4 carbon atoms; n is an integer of 1 to 3; R3 is alkyl of 1 to 3 carbon atoms; and A- is RSO3- (wherein R is CF3, phenyl, tolyl, or alkyl of 1 to 3 carbon atoms), a halide anion, or ClO4-. |