Three-photon-induced Luminescence of Europium Acetylacetonate-type Complexes
Y. Suzuki, H. Moritomo, A. Fuji, K. Satomi, J. Kawamata, M. Yamamoto, Y. Hasegawa
Chem. Lett., 2016, 45, 538-540.
DOI : 10.1246/cl.160126

Abstract: We measured the three-photon absorption spectra of two europium acetylacetonate-type complexes. The three-photon absorption peak wavelengths of tris(hexafluoroacetylacetonato)europium(III) (Eu(hfa)) and tris(2-naphthoyltrifluoroacetonato)europium(III) (Eu(ntfa)) were 925 and 1025 nm, respectively. The peak values of the 3PA cross-sections of Eu(hfa) and Eu(ntfa) were 1.9 and 13.9 GM (1 GM = 10−82 cm6 s2), respectively. Using Eu(ntfa) as a probe, a three-photon microscope image of a living cell was obtained using a 1030 nm operating femto-second fiber laser as the light-source. Thus, Eu(ntfa) is a fiber laser excitable luminescent probe useful for three-photon microscopy.