Energy transfer process at room temperature for cerium (sensitizer) oxalate single crystals doped with different concentrations (10, 13, 15, 17 and 20%) of praseodymium ions (activator) grown by hydro silica gel method has been evaluated. The analysis of energy level diagrams of cerium and praseodymium ions indicates that the energy gap between the sensitizer and the activator ions varies in a small range suggesting a possible energy transfer from the Ce 3+ to Pr 3+ . The emission and absorption spectra of these crystals were recorded. The overlapping of the absorption spectra of Pr 3+ and emission spectra of Ce 3+ at wavelengths 484 and 478 nm, respectively, strongly supports the possible energy transfer process in this system. From the absorption spectra, oscillator strength, electric dipole moment, branching ratio and Judd-Ofelt parameters of this system were evaluated by least square programming. The quantum efficiency, energy transfer probabilities and thermal properties have been studied.
Spectroscopic properties of praseodymium ions-doped erbium oxalate (Er 2 (C 2 O 4 ) 3 · nH 2 O) crystals have been investigated. The crystals were grown by hydro silica gel method under suitable pH conditions and by single diffusion method. The well-grown crystals are bright and transparent. The dark green colour of these crystals changes with the variation of the concentrations of the dopant ions. The absorption spectra have been measured in the region 200-800 nm at room temperature. Judd-Ofelt intensity parameters for f-f transitions of the Pr 3+ ions have been determined as 2 = 166.7, 4 = 1.103 and 6 = 2.898. Analyses of the absorption spectra also show a possible energy transfer from the host material to the dopant.
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