Two novel two-photon polymerization initiators, 10-ethyl-3-E-(4-(N, N′-di-n-butylamino) styryl) phenothiazine 5 and 10-ethyl-3, 7-E, E-bis (4-(N, N′-di-n-butyl amino) styryl) phenothiazine 6, have been efficiently synthesized with room temperature solid phase Wittig reaction. Two initiators were found to exhibit good single-photon fluorescence emission and their quantum yields, lifetimes and solvent effects have been studied in detail. Two-photon ...