Abstract

AbstractA novel pyridinium salt, 2,4‐bis[p‐(N,N‐dimethylamino)styryl]‐N‐methyl pyridinium iodide (BMSPI) was synthesized and characterized by TG, 1H NMR spectroscopy and elemental analysis. and the reaction process was studied by Using ES‐MS. When BMSPI was pumped by a pulsed 1064 nm, 50 ps laser him. it manifests highly efficient TPA (Two‐Photon Absorption) and up‐conversion superradiance. The up‐conversion efficiency was 6.0% at the pump energy of 4–6 mJ and the Lifetime of two‐photon fluorescence was measured as 59 ps.

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