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Effect of sensitizing Cr3+ ion on optical parameters of Nd-doped yttrium calcium oxyborate crystals

Published online by Cambridge University Press:  31 January 2011

H. R. Xia ,
M. Guo ,
J. Y. Wang ,
J. Q. Wei ,
X. B. Hu  and
Y. G. Liu
H. R. Xia
Affiliation:
Department of Physics & National Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
M. Guo
Affiliation:
Institute of Crystal Materials & National Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
J. Y. Wang
Affiliation:
Institute of Crystal Materials & National Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
J. Q. Wei
Affiliation:
Institute of Crystal Materials & National Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
X. B. Hu
Affiliation:
Institute of Crystal Materials & National Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
Y. G. Liu
Affiliation:
Institute of Crystal Materials & National Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
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Abstract

Pure, Nd doped, and Nd–Cr bidoped yttrium calcium oxyborate Yca4O(BO3)3 (YCOB), NdxY1−xCa4O(BO3)3 (NYCOB) with x = 0.86, and Cr:NdxY1−xCa4O(BO3)3 (Cr:NYCOB) with x = 0.45 and a small amount of Cr3+ ions crystallized with a fluorapatite-type structure in the monoclinic system. The unit cell constants were a = 0.8076(7), b = 1.6020(10), and c = 0.3527(2) nm with the angle β of 101.23° for the NYCOB and z = 2. The measured absorption spectra of NYCOB and Cr:NYCOB were compared to Judd–Ofelt (JO) theory. When applied, the JO theory of parity-forbidden electric-dipole transitions of rare earth ions on noncentrosymmetric sites demonstrates good agreement. The experiments showed that the Cr3+ ions were introduced into the crystalline lattice as a sensitizer to absorb the excitation energy and transfer it to the Nd3+ ions in the lattice structure.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 10 , October 2000 , pp. 2209 - 2214
Copyright
Copyright © Materials Research Society 2000

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