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Radiation Effects and Defects in Solids
Incorporating Plasma Science and Plasma Technology
Volume 135, 1995 - Issue 1-4
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Spectroscopy luminescence

Optical properties of Cr3+-ions in LaSr2Ga11O20

A. Luci Dipartimento di Fisica, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 1, 00133, Roma, Italy
,
M. Casalboni Dipartimento di Fisica, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 1, 00133, Roma, Italy; Dip. Matematica e Fisica, Università di Camerino, Via Madonna delle Carceri, 62032, Camerino, Italy
,
T. Castrignanò Dipartimento di Fisica, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 1, 00133, Roma, Italy
,
U. M. Grassano Dipartimento di Fisica, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 1, 00133, Roma, Italy
&
A. A. Kaminskii Dipartimento di Fisica, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 1, 00133, Roma, Italy; Institute of Crystallography-Russian Academy of Sciences, Moscow, Russia
Pages 227-230 | Published online: 19 Aug 2006
 
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Abstract

The optical properties of Cr3+ ions in the disordered LaSr2Ga11O20 crystal have been investigated through absorption, emission, excitation spectra. Polarized excitation measurements allows us to evaluate the crystal field parameters and to infer the distortion of the octahedral site of Cr3+. In spite of the relatively low value of the crystal field (Dq/B = 2.26) obtained from optical data, the emission spectra are constituted by two narrow lines. This behavior, typical of strong field material, is explained by an even lower value of the crystal field corresponding to the 2E, 4T2 crossing point obtained by means of the Tanabe-Sugano diagram. The value of the splitting and the width of the emission lines, intermediate between crystals and glasses, confirm the disordered structure of this crystal.

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