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| The Preparation and Characterization of Yb-Tm Ions Codoped Tungstate Nanocrystal |
| SU Ji-yi,MA Hong-tu,QU Ming-lei,SHI Lin
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Abstract In this paper， BaWO4: Yb3+， Tm3+ powder with ideal luminescence properties was synthesized by
hydrothermal method．The effects of doping ratios on synthesis were studied．The best preparation process was
determined．The products are characterized by X－ray diffraction and scanning electron microscope．The results
indicate that Yb3+-Tm3+ co-doped BaWO4 is tetragonal crystal system，the particle size ranged from 25 to 40 nm
and dispersed uniformly．The spectrum was measured with Hitachi F － 4500 spectrophotometer under 980 nm
diode laser excitation． The results are as follows: The emission peaking of BaWO4: Yb3+， Tm3+ nanocrystal
located at 457， 478 and 650 nm corresponding to 1D2 →3F4， 1G4 →3H6 and 1G4 →3F4 transitions of Tm3+，
respectively．The results show that the luminous intensity is best when concentration ratio of Yb3+ /Tm3+ is 7 1，
and the pertinent up-conversion mechanism model of the sample were proposed．
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Published: 25 January 2018
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