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Photoluminescence rare-earth / -diketonates

Metal-centered emission is found in several rare-earth complexes, for example europium diketone chelates [29]. These compounds emit relatively narrow spectra associated with the d-f transitions of the metal ion. Relatively few comprehensive studies of this class have been carried out to date, but the available evidence [30] seems to indicate that the photoluminescent efficiencies are somewhat lower than the ligand-centered emitters. [Pg.221]

Figure 2.30 Representation of the asymmetric unit of [Nd(L )4(H20)][(TTF—CH=CH—Py+)] 2-The radical cation donors are drawn as balls and sticks the paramagnetic anionic coordination complexes of Nd(III) are drawn as capped sticks [23d], (Reprinted with permission from F. Pointillart, O. Maury, Y. Fe Gal, S. Golhen, O. Cador and F. Ouahab, 4-(2-Tetrathiafulvalenyl-ethenyl)pyridine (TTF—CH=CH—py) radical cation salts containing poly(P-diketonate) rare earth complexes synthesis, crystal structure, photoluminescent and magnetic properties, Inorganic Chemistry, 48, 7421-7429, 2009. 2009 American Chemical Society.)... Figure 2.30 Representation of the asymmetric unit of [Nd(L )4(H20)][(TTF—CH=CH—Py+)] 2-The radical cation donors are drawn as balls and sticks the paramagnetic anionic coordination complexes of Nd(III) are drawn as capped sticks [23d], (Reprinted with permission from F. Pointillart, O. Maury, Y. Fe Gal, S. Golhen, O. Cador and F. Ouahab, 4-(2-Tetrathiafulvalenyl-ethenyl)pyridine (TTF—CH=CH—py) radical cation salts containing poly(P-diketonate) rare earth complexes synthesis, crystal structure, photoluminescent and magnetic properties, Inorganic Chemistry, 48, 7421-7429, 2009. 2009 American Chemical Society.)...
Energy transfer between organic ligands and rare earth ions Investigation of rare earth S-diketonate photoluminescence began in 1942 with Weiss-man s work , which was the first observation of the indirect excitation arising from the... [Pg.142]

Most solid rare-earth /3-diketonates are white, yellow or brown, and in general their color is determined by the color of the /3-diketonate ligands. Only in the case of white j8-diketonate ligands, the typical color of the lanthanide ion can be observed, for instance a greenish color for praseodymium(III) compounds and a blue-violet color for neodymium(III) compoimds. Some europium(III) /3-diketonates show a pink color in daylight, because of the intense photoluminescence of these compounds. [Pg.144]

Many examples of hemicyanine dyes with rare-earth tetrakis -diketonate complexes incorporated into Langmuir-Blodgett films have been described in the literature. These rrraterials are discussed in section 7.7. The rare-earth complex does not only improve the qrrality of the LB-films, but better nonlinear optical properties were foimd as well. Pavier et al. (1997) investigated the photoluminescence of LB-films in which ytterbium(III) complexes of pyrazolone ligands were used as counter ions. The fluorescence of the hemicyanine ligand was observed in the visible region, and metal-centered luminescence of Yb + in the near-infrared region. [Pg.200]


See other pages where Photoluminescence rare-earth / -diketonates is mentioned: [Pg.142]    [Pg.186]    [Pg.1]    [Pg.86]    [Pg.169]    [Pg.194]   
See also in sourсe #XX -- [ Pg.142 , Pg.143 , Pg.144 , Pg.145 , Pg.146 , Pg.147 , Pg.148 , Pg.149 , Pg.150 , Pg.151 , Pg.152 , Pg.153 , Pg.154 , Pg.155 , Pg.156 , Pg.157 , Pg.158 , Pg.159 , Pg.169 , Pg.715 ]




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