TY - JOUR
T1 - Judd-Ofelt parameters of Er3+ in transparent TeO 2-based nanocrystallized glasses
AU - Naito, K.
AU - Benino, Y.
AU - Fujiwara, T.
AU - Komatsu, T.
N1 - Funding Information:
This work was supported with a Grant of Nippon Sheet Glass Foundation for Materials Science and Engineering, and a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan, and the 21st Century Center of Excellence (COE) Program in Nagaoka University of Technology.
PY - 2004/8
Y1 - 2004/8
N2 - Transparent Er3+-doped bulk nanocrystallized (size of nanocrystals: ∼40 nm) glasses of 15K2O·15Nb 2O5·70TeO2·0.5Er 2O3 and 10BaO·10Gd2O 3·80TeO2·0.5Er2O3 are prepared, and the Judd-Ofelt parameters, Ωt (t=2, 4, 6), of Er3+ are evaluated from optical absorption spectra. The change in the molar polarizability due to the nanocrystallization is small in both samples, but a clear decrease in the mean atomic volume due to the nanocrystallization, i.e. more close atom packing, is observed. In both systems, a large decrease is observed in the Ω2 parameter due to the nanocrystallization, indicating that the degree of the site symmetry of Er3+ ions in nanocrystallized glasses is much higher than that in the precursor glasses. The decrease in the Ω4 and Ω6 parameters due to the crystallization is small, suggesting that the covalency of Er3+-O bonds in nanocrystals is not so different from that in the precursor glasses.
AB - Transparent Er3+-doped bulk nanocrystallized (size of nanocrystals: ∼40 nm) glasses of 15K2O·15Nb 2O5·70TeO2·0.5Er 2O3 and 10BaO·10Gd2O 3·80TeO2·0.5Er2O3 are prepared, and the Judd-Ofelt parameters, Ωt (t=2, 4, 6), of Er3+ are evaluated from optical absorption spectra. The change in the molar polarizability due to the nanocrystallization is small in both samples, but a clear decrease in the mean atomic volume due to the nanocrystallization, i.e. more close atom packing, is observed. In both systems, a large decrease is observed in the Ω2 parameter due to the nanocrystallization, indicating that the degree of the site symmetry of Er3+ ions in nanocrystallized glasses is much higher than that in the precursor glasses. The decrease in the Ω4 and Ω6 parameters due to the crystallization is small, suggesting that the covalency of Er3+-O bonds in nanocrystals is not so different from that in the precursor glasses.
KW - A. Nanostructures
KW - B. Nanofabrications
KW - D. Optical properties
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U2 - 10.1016/j.ssc.2004.05.037
DO - 10.1016/j.ssc.2004.05.037
M3 - Article
AN - SCOPUS:3042706702
SN - 0038-1098
VL - 131
SP - 289
EP - 294
JO - Solid State Communications
JF - Solid State Communications
IS - 5
ER -