Abstract
NaGd(WO4)2:Yb3+, Ho3+ single crystals have been grown by the Czochralski technique along the (0 0 1) orientation. Conversion of the infrared (IR) radiation at 980 nm into the visible emission in NaGd(WO4)2 crystals containing several different concentrations of Yb3+ and Ho3+ has been investigated. The NaGd(WO4)2: 8 at. % Yb3+, 4 at. % Ho3+ system exhibits intense red upconverted emission originating from the 5F5
level. The upconversion mechanism in a Ho3+-Yb3+ system under near infrared excitation is discussed. It is concluded that the green emission is excited by energy transfers from Yb3+ to Ho3+, whereas excited state absorption is involved in the excitation of red emission. The emission cross-section of the 5F5→5I8 transition at about 660 nm was estimated by using the Füchtbauer–Ladengurg formula.
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78.55.Hx; 78.20.-e
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Wang, H., Tu, C., You, Z. et al. Conversion of infrared radiation into visible emission in NaGd(WO4)2:Yb3+, Ho3+ crystals. Appl. Phys. B 88, 57–60 (2007). https://doi.org/10.1007/s00340-007-2675-x
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DOI: https://doi.org/10.1007/s00340-007-2675-x