One- and two-photon absorption properties of a novel europium(III) complex containing a hemicyanine cation are investigated in this paper; in which the sensitization wavelength of europium(III), induced by beta-diketonate ligands, is in the ultraviolet range, and the hemicyanine(aminostyrylpyridinium) cation extends the sensitization wavelength of Eu(III) to visible region. Furthermore, under 1.06 microm ultrashort pulse laser excitation, the complex exhibits effective europium(III) luminescence induced by the two-photon absorption of the hemicyanine cation. Therefore, this new europium(III) complex with excitation bands in the near infrared, visible and ultraviolet ranges. Since the 1.06-microm ultrafast laser is one of the most frequently used laser sources and 1.06 microm is an 'optical window' for cells and tissues, the results suggest that this kind of complex has promising applications in deep-penetrating and high quality bioimaging in vivo.
Optical characteristics of ZnxMg1−xO, ZnO:Al, and ZnO epilayers are investigated. At pulse laser pumping, stimulated emissions are observed in these epilayers. Among them, spectral blueshifts are dependent on the Mg substitution concentration, and the highest lasing photon energy of 3.51eV ever reported is observed in ZnO series materials. Furthermore, experimental results also show that by high concentration Mg substitution, a redshift of the electron-hole plasma stimulated emission is reduced and its efficiency does not decrease with the Mg substitution concentration. These results imply that the lasing frequency of ZnO series materials can be modified by substitution.
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