Luminescence processes in the crystalline and glass modifications of LnBGeO sub 5 -type composition

The luminescence properties of the Eu{sup 3+} ion in the crystalline and glass modifications of LnBGeO{sub 5}-type compositions (Ln = La, Gd, Y, and CaBPO{sub 5}) are investigated. The efficiency of the luminescence upon broad band excitation is higher in the crystals than it is in the glasses. Wher...

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Bibliographic Details
Published in:Journal of solid state chemistry 1990-11, Vol.89:1
Main Authors: Verwey, J.W.M., van der Voort, D., Dirksen, G.J., Blasse, G.
Format: Article
Language:English
Subjects:
400102 - Chemical & Spectral Procedures
BORON COMPOUNDS
CHALCOGENIDES
DATA
ELEMENTS
EMISSION SPECTRA
EUROPIUM
EXPERIMENTAL DATA
GADOLINIUM COMPOUNDS
GERMANIUM COMPOUNDS
GERMANIUM OXIDES
INFORMATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LANTHANUM COMPOUNDS
LUMINESCENCE
MEASURING METHODS
MEDIUM TEMPERATURE
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
RARE EARTHS
SPECTRA
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
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Summary:The luminescence properties of the Eu{sup 3+} ion in the crystalline and glass modifications of LnBGeO{sub 5}-type compositions (Ln = La, Gd, Y, and CaBPO{sub 5}) are investigated. The efficiency of the luminescence upon broad band excitation is higher in the crystals than it is in the glasses. Whereas crystalline GdBGeO{sub 5}: Eu is a very efficient luminescent material, crystalline LaBGeO{sub 5}:Eu and CaBPO{sub 5}:Eu show only medium efficiency, and the glass modifications are of a low to very low efficiency. The influence of the charge and the size of the ion for which Eu{sup 3+} is substituted is discussed. The influence of these cations on the efficiency of the luminescence of the Eu{sup 3+} ion is well known for crystalline compositions, but is observed for the first time in the glass modifications, where they play the role of network modifiers. The undoped compositions show a blue luminescence.
ISSN:0022-4596
1095-726X
DOI:10.1016/0022-4596(90)90299-D