Abstract
The Er3+-Li+ codoped TiO2 powders have been prepared by the non-aqueous sol–gel method. The green and red upconversion emissions centered at about 526, 550 and 663 nm were observed by the 2H11/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions of Er3+, respectively. Li+ codoping has opposite effect on the upconversion emissions intensities for Er3+-doped TiO2 at sintering temperatures of 1,073 and 1,273 K. At 1,073 K, the Er3+-doped TiO2 phase transition from anatase to rutile was accelerated with increasing Li+ codoping concentration, leading to the increase of crystal field symmetry of Er3+, thus the upconversion emissions intensities decreased. At 1,273 K, Li+ codoping had no effect on the phase structure of Er3+-doped TiO2 and only increased the Er–O bond length, it indicated that the upconversion emissions intensities greatly enhanced because of the decrease of crystal field symmetry of Er3+.
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Acknowledgments
We acknowledge the technical assistance of M. Song, H. Y. Luo, H. P. Wang and J. Xu in this research. This work is supported by the National Science Foundation of China under Grant No. 10804015.
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Cao, B.S., Feng, Z.Q., He, Y.Y. et al. Opposite effect of Li+ codoping on the upconversion emissions of Er3+-doped TiO2 powders. J Sol-Gel Sci Technol 54, 101–104 (2010). https://doi.org/10.1007/s10971-010-2163-3
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DOI: https://doi.org/10.1007/s10971-010-2163-3