Abstract
The frequency upconversion (UC) emission throughout the visible region from the Y2O3:Ho3+–Tm3+–Yb3+ co-doped phosphors synthesized by using low temperature combustion process upon excitation with a diode laser operating at 980 nm have been presented. The colour emission tunability in co-doped phosphor has been observed on increasing the pump power and seen by the naked eyes. The tunability in colour emission has also been visualized by CIE chromaticity diagram. The variation in UC emission intensity of the 1G4 → 3H6 (Tm3+) and 5F3 → 5I8 (Ho3+) transitions lying in the blue region has been monitored with increase in the pump power and marked that their ratio can be used to determine the temperature. The developed phosphor has been used to record fingerprints. The observed most intense visible colour emission from the developed material may be used for photodynamic therapy and as an alternative of traditional fluorescent biolabels.
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Authors are grateful to the University Grants Commission, New Delhi, India for providing the financial assistance.
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Pandey, A., Rai, V.K. Colour emission tunability in Ho3+–Tm3+–Yb3+ co-doped Y2O3 upconverted phosphor. Appl. Phys. B 109, 611–616 (2012). https://doi.org/10.1007/s00340-012-5224-1
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DOI: https://doi.org/10.1007/s00340-012-5224-1