Abstract
GdVO4 single crystal co-doped with Yb3+ and Er3+ was grown by the Czochralski method. The X-ray powder diffraction pattern of Yb,Er:GdVO4 crystal confirms that the as-grown crystal is isostructural with pure GdVO4 crystal. Its polarized absorption spectra and non-polarized fluorescence spectra were measured at room temperature. The absorption band at 984 nm for π-polarization has an FWHM of about 36 nm, which is favorable for InGaAs LD laser pumping. The spectrum properties of Er3+ in Yb,Er:GdVO4 crystal were investigated based on Judd–Ofelt theory. There is strong energy transfer from Yb3+ to Er3+ in this crystal. When excited with 980 nm radiation, this crystal emitted strong fluorescence at about 1529 nm and 552.5 nm. The total energy transfer rate and efficiency from Yb3+ to Er3+ is 3.33 ms-1 and 67%, respectively. The energy transfer between Er3+ and Yb3+ ions is a multistep transfer process, and was investigated based on a random-walk model. The investigation result shows that there is strong cooperative-sensitization effect from Yb3+ to Er3+, which is the main upconversion energy-transfer process in this crystal.
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42.70.Hj; 81.10.Fq; 42.55.Rz
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Zhuang, N., Hu, X., Gao, S. et al. Spectral properties and energy transfer of Yb,Er:GdVO4 crystal. Appl. Phys. B 82, 607–613 (2006). https://doi.org/10.1007/s00340-005-2091-z
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DOI: https://doi.org/10.1007/s00340-005-2091-z