Nd 3+ , Eu 3+ and Yb 3+ Ions as Structural Probes in the Scheelite-Type Cadmium Molybdates with Vacancies

摘要: The main aim of this research is to demonstrate how important are the laser techniques like site selective spectroscopy and time-resolved at low temperature in determining structure compounds complementarity usual XRD diffraction technique. Basing on analyse specific lines 5D0 ↔ 7F0 Eu3+ ion, 4I9/2 → 2P1/2, 4F3/2 absorption transitions Nd3+, ion as well zero-phonon line 2F5/2 2F7/2 Yb3+ we get precise information about active metal CdMoO4 host lattice. As a good example have chosen series rare earth-doped vacancied scheelite-type cadmium molybdate micro-crystals Cd1-3xRE2x□xMoO4 (where RE = Yb3+) solid solutions prepared by high-temperature state method. monophasic samples crystallize tetragonal (the space group I4 1 /a, with point symmetry S4) when concentration optical activator between 0 66.67 mol% Nd3+ or ions 33.36 ions. substitution divalent Cd2+ trivalent RE3+ cations leads formation cationic vacancies framework (which denoted chemical formula □), due charge compensation: 3Cd2+ 2YRE3+ + □ vacancy. We check relationship structural spectroscopic properties earth probes mainly confirming presence multi-sites each dopant. also analyze vacancy dependence may enhanced parameters brings some originality program materials. show that -doped investigated materials interesting for potential applications promising phosphors activated under excitation UV light very strong red luminescence, values cross-section, emission intensity parameters.