Journal
OPTICAL MATERIALS
Volume 16, Issue 1-2, Pages 301-310Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0925-3467(00)00090-2
Keywords
phosphate-silicate apatite; trivalent europium; time-resolved luminescence
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The present paper reports the Eu3+ fluorescence in the continuous solid solution Ca2+xLag-x(SiO4)(6-x) (PO4)(x)O-2 (x = 0, 3, 6) of the apatitic phosphate-silicates M-10(XO4)(6)Y-2 with M = Ca: La/X = P, Si and Y = O. Selective UV laser excitation, site-selective-laser excitation in the D-5(0) level have been performed at 300 and 77 K D-5(0) level decay times have been reported. In these compounds, Eu3+ can be observed in the three crystallographic positions Ca(I), Ca(II) and La(II) of the two cationic sites labeled M(I) (4f) C-3 symmetry and M(II) (6h) C-s symmetry. The dominant one is found M(II) due to an Eu - O privileged bonding with Eu3+ located in (6h) positions either in La(II) or in Ca(II). (C) 2001 Elsevier Science B.V. All rights reserved.
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