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Crystal structure of mixed fluorites Ca(1-x)Sr(x)F(2) and Sr(1-x)Ba(x)F(2) and luminescence of Eu(2+) in the crystals | | A.E. Nikiforov
; A.Yu.Zaharov
; V.A.Chernyshev
; M.Yu.Ougrumov
; S.V.Kotomanov
; | | Date: |
13 Jun 2002 | | Subject: | Materials Science | cond-mat.mtrl-sci | | Abstract: | Within the framework of the virtual crystal method implemented in the shell model and pair potential approximation the crystal structure of mixed fluorites Ca(1-x)Sr(x)F(2) and Sr(1-x)Ba(x)F(2) has been calculated. The impurity center Eu(2+) and the distance Eu(2+)-F in this crystals have been also calculated. The low level position of excited 4f65d configuration of the Eu(2+) ion has been expressed using phenomenological dependence on distance E(2+)-F. The dependences of Stokes shift and Huang-Rhys factor on concentration x have been received for yellow luminescence in Sr(1-x)Ba(x)F(2):Eu(2+). The value x, for which the eg -level of Eu(2+) ion will be in conduction band in Sr(1-x)Ba(x)F(2):Eu(2+) has been calculated. | | Source: | arXiv, cond-mat/0206219 | | Services: | Forum | Review | PDF | Favorites | |
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