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Synthesis and Upconversion Properties of LiTaO3 Doped with Rare Earth

Author: ChouZhaoZhong
Tutor: WangRui
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: high temperature solid state method LiTaO3 rare-earth ions up-conversion luminescence
CLC: O482.31
Type: Master's thesis
Year: 2011
Downloads: 51
Quote: 0
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Abstract


Stoichiometric Lithium tantalate （SLT） polycrystalline powders and LiTaO3 polycrystalline powder of the solid-liquid congruent point composition（CLT） and Mg2+ doped CLT were synthesized by solid-state reaction method. We determined the stoichiometric LiTaO3 for the optimal matrix luminous by comparison the intensity of the up-conversion luminescence in different experimental matrix. it was found that the best conditions was 22 hours at 1200℃by testing different sintering time on the luminescence properties optimum process conditions.The results of X-ray diffraction showed that there was no new phase appeared in LiTaO3 polycrystalline powder. The combination of the results of X-ray diffraction and Ultraviolet-visible absorption spectrum were used to analysis the location of the rare-earth ions.Bright green and weak red color was obtained in Er3+ doped LiTaO3 polycrystalline powder under diode laser excitation of 980 nm, and the up-conversion emission intensity of green and red color were all enhanced through increasing the doped Er3+ ion concentration. Bright green and red light were obtained in Er3+/Yb3+-doped LiTaO3 polycrystalline powder under diode laser excitation of 980 nm, and the up-conversion emission intensity of green and red light were all enhanced through increasing the the doped Yb3+ ion concentration. Obviously, the red up-conversion emission intensity enhanced more than the green up-conversion emission intensity. The green emission peaks centered at 530nm and 550nm are attributed to the 2H11/2/4S3/2→4I15/2 transitions of the Er3+ ions, and the observed red emission peaks centered at 670 nm are attributed to the Er3+ ion 4F9/2→4I15/2 transition.White upconversion emission were obtained in Er3+/Tm3+/Yb3+-doped LiTaO3 polycrystalline powder under diode laser excitation of 980 nm through adjusting the doped Er3+/Tm3+/Yb3+ ions concentrations in the room temperature.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Optical Properties > Luminescence
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