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Emission characteristics of Er3+ in vapor-transport-equilibrated Er/Zn-codoped LiNbO3 crystals
- Source :
-
Journal of Luminescence . Oct2008, Vol. 128 Issue 10, p1709-1718. 10p. - Publication Year :
- 2008
-
Abstract
- Abstract: Polarized visible and infrared emission characteristics of Er3+ ions in vapor-transport-equilibration (VTE)-treated LiNbO3 crystals codoped with different concentrations of Zn and Er were investigated in comparison with corresponding as-grown crystals. The results show that the VTE treatment leads to substantial spectral changes of Er3+ emissions at 0.65, 0.98 and 1.5μm regions, and the spectral changes in the 0.98 and 1.5μm regions appear to be Zn-concentration-dependent. It is concluded in combination with X-ray powder diffraction results and optical absorption characteristics reported previously that the VTE treatment resulted in crystalline phase transformation with respect to Er3+ ions from original LiNbO3 to ErNbO4 phase in all crystals studied. The formation of the ErNbO4 phase and the Zn2+ codopants are responsible for the VTE-induced substantial spectral changes. The emission characteristics of the ErNbO4 precipitates in the Zn/Er-codoped crystals are found to be very different from those of the ErNbO4 precipitates in the only Er-doped crystal in the infrared region, and the difference is attributed to the influence of the Zn2+ codopant on the Er3+ ion environment. The mechanism of the crystalline phase transformation is qualitatively explained from the viewpoint of the declined solubility of Er3+ ion in a Li-rich LiNbO3 crystal and from the phase diagram of Li2O–Nb2O5 system. [Copyright &y& Elsevier]
- Subjects :
- *EMISSION spectroscopy
*CRYSTALLOGRAPHY
*X-ray diffraction
*SOLUTION (Chemistry)
Subjects
Details
- Language :
- English
- ISSN :
- 00222313
- Volume :
- 128
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Journal of Luminescence
- Publication Type :
- Academic Journal
- Accession number :
- 33390190
- Full Text :
- https://doi.org/10.1016/j.jlumin.2008.03.017