Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 62, Issue 11, Pages 2075-2082Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0022-3697(01)00077-4
Keywords
glasses; optical materials; X-ray diffraction; optical properties
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Optically transparent rare earth (Ln)-doped glass-ceramics based on the system K2O-Nb2O5-TeO2 have been prepared, and the effect of Ln additions on crystallization behaviors and optical properties has been examined. The lattice constant of the TeO2-based metastable optical nonlinear nanocrystalline phase (average particle size: < 60nm) with basically a cubic structure in the glass-ceramics decreases due to Ln additions, and the incorporation of Ln(3+) with small ionic radii such as Er3+ or Tm3+ stabilizes the metastable crystalline phase, giving the significant effect on the crystallization and phase transformation behaviors in TeO2-based glasses. From the phonon sideband spectra associated with the (5)Do --> F-7(0) transition of Eu3+, it is found that both phonon energy and electron phonon coupling strength for transparent glass-ceramics are smaller than those in the precursor glass. The upconversion fluorescence intensity around 550 nm due to the S-4(3/2) --> I-4(15/2) transition of Er3+ is strong (about 20 times) compared with the precursor glass. (C) 2001 Elsevier Science Ltd. All rights reserved.
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