EFFECTS OF CA2+ZR4+ION-PAIRS ON SPECTROSCOPIC PROPERTIES OF CR3+MULTISITES IN CR3+-DOPED GD3GA5O12 GARNETS

Some disorder exists in Gd3Ga5O12 (GGG) garnets because of a partial occupation of the octahedral sites by the Gd3+ ions. The luminescence of the Cr3+ ions introduced as dopant in the material is then affected. The situation is worse in (Ca,Zr)-substituted GGG due to a great deal of Ca-Zr defects in...

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Veröffentlicht in:	Journal of applied physics 1992-06, Vol.71 (12), p.6062-6068
Hauptverfasser:	BRENIER, A, BOULON, G, PEDRINI, C, MADEJ, C
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Photoluminescence Physical Sciences Physics Physics, Applied Science & Technology
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	Some disorder exists in Gd3Ga5O12 (GGG) garnets because of a partial occupation of the octahedral sites by the Gd3+ ions. The luminescence of the Cr3+ ions introduced as dopant in the material is then affected. The situation is worse in (Ca,Zr)-substituted GGG due to a great deal of Ca-Zr defects introduced in large quantity in order to have a congruent composition. A simple model based on the local dilatation of the lattice around each defect is presented in order to describe the Cr3+ luminescence at any temperature. The influence of Ca-Zr ion pairs on the average Cr3+-->Tm3+ energy transfer is also studied.
ISSN:	0021-8979 1089-7550
DOI:	10.1063/1.350463