Artigo
Presence of excited electronic state in CaWO4 crystals provoked by a tetrahedral distortion: An experimental and theoretical investigation
Fecha
2011-08-15Registro en:
Journal of Applied Physics. Melville: Amer Inst Physics, v. 110, n. 4, p. 11, 2011.
0021-8979
10.1063/1.3615948
WOS:000294484300021
WOS000294484300021.pdf
Autor
Univ Jaume 1
Universidade Estadual Paulista (Unesp)
Universidade de São Paulo (USP)
Resumen
By combining experimental techniques such as x-ray diffraction, Fourier transform Raman, ultraviolet-visible, x-ray absorption near edge structure, extended x-ray absorption fine structure spectroscopy, and theoretical models, a general approach to understand the relationship among photoluminescence (PL) emissions and excited electronic states in CaWO4 crystals is presented. First-principles calculations of model systems point out that the presence of stable electronic excited states (singlet) allow us to propose one specific way in which PL behavior can be achieved. In light of this result, we reexamine prior experiments on PL emissions of CaWO4. (C) 2011 American Institute of Physics. [doi:10.1063/1.3615948]