Pressure-Induced d- to f-Orbital Energy Crossover in Sm2+ Ion in CsSmI3: A Luminescence Study

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Abstract:

The divalent samarium ion has a 4f 6 configuration. Its energy level diagram resembles that of its isoelectronic ion Eu3+. On the other hand, the lowest excited state of the 4f 55d 1 configuration with energy analogous to the lowest excited state of the 4f 6 configuration, 5 D 0, also exists. This factor alters the luminescence properties of the Sm2+ ion in host crystals. Broad luminescence bands in the visible and/or the near-infrared regions should be observed for the transition from the 4f 55d 1 configuration to the ground state. It is well known that if the excited level 5 D 0 in the 4f 6 configuration is lower in energy than the lowest level of the 4f 55d 1 configuration, then the sharp luminescence bands from the f-f transitions can be observed. As reported earlier from studies with alkaline-earth fluorides, the luminescence lines of Sm2+ are very sensitive to the host crystal for the transition between the 4f 55d 1 and 4f 6 configuration. Pressure effects on the different optical transitions of Sm2+ -doped SrF2 have also been studied recently, and it was reported that pressure has a larger effect on the transition between the 4f 55d 1 and 4f 6 configurations than on those within the 4f 6 configuration.

Keywords: CsSmI3; Luminescence; Orbital energy crossover; Pressure

Document Type: Short Communication

DOI: http://dx.doi.org/10.1366/0003702944029622

Affiliations: 1: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600, U.S.A. 2: Department of Chemistry, Beijing Normal University, Beijing 100875, China 3: Transuranium Research Laboratory (Chemical and Analytical Sciences Division), Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6375, U.S.A. 4: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1600, U.S.A.; Transuranium Research Laboratory (Chemical and Analytical Sciences Division), Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6375, U.S.A.

Publication date: August 1, 1994

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