Investigation of luminescence and optical absorption of K{sub 2}LiAlF{sub 6}:Cr{sup 3+} single crystals
- Instituto de Fisica, Universidade Federal do Rio de Janeiro, 21945-970, RJ (Brazil)
- Instituto de Fisica, Universidade do Estado do Rio de Janeiro, 20559-900, RJ (Brazil)
Photoluminescence, absorption and excitation spectra of K{sub 2}LiAlF{sub 6} single crystals doped with 1% of Cr{sup 3+} are presented. The near-infrared photoluminescence observed at room temperature, 77 and 4 K are attributed to the zero-phonon spin-allowed {sup 4} T {sub 2}({sup 4} F){sup {yields}} {sup 4} A {sub 2}({sup 4} F) transition of Cr{sup 3+} octahedrally coordinated by F{sup -} ions. Lifetimes are obtained. The 4 K emission broad band was described in terms of normal modes of the octahedral complex [CrF{sub 6}]{sup 3-}. The Racah, crystal-field and Huang-Rhys parameters are calculated and the quantum efficiency and thermal quenching estimated and compared with Cr{sup 3+} properties in different environments. - Graphical abstract: Photoluminescence spectra of K{sub 2}LiAlF{sub 6} doped with 1.0 at% Cr{sup 3+} at: (a) room temperature (300 K), (b) 77 K and (c) 4 K.
- OSTI ID:
- 20900911
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 12; Other Information: DOI: 10.1016/j.jssc.2006.08.003; PII: S0022-4596(06)00456-7; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
ALUMINIUM COMPOUNDS
CHROMIUM FLUORIDES
CHROMIUM IONS
CRYSTAL FIELD
DOPED MATERIALS
EXCITATION
FLUORINE IONS
LIFETIME
LITHIUM COMPOUNDS
MONOCRYSTALS
PHOTOLUMINESCENCE
POTASSIUM COMPOUNDS
QUANTUM EFFICIENCY
QUENCHING
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K