Effects of calcination temperature and Li⁺ ions doping on structure and upconversion luminescence properties of TiO₂:Ho³⁺-Yb³⁺ nanocrystals

Kaishun Zou^1,2，Guangzong Dong¹，Juncheng Liu¹，Boxu Xu¹，Danping Wang¹

1. School of Materials Science and Engineering,Tianjin Polytechnic University2. School of Science,Tianjin Polytechnic University

摘 要：Ho³⁺-Yb³⁺ co-doped and Ho³⁺-Yb³⁺-Li⁺ tri-doped TiO₂ nanocrystals were prepared using the sol-gel method. Effects of the calcination temperature and Li⁺ ions doping on the structure and upconversion luminescence properties of Ho³⁺-Yb³⁺ co-doped TiO₂ nanocrystals were investigated. The upconversion luminescence of nanocrystals was enhanced with the reduction of the crystal lattice symmetry and the crystallinity improvement of the matrix, which were facilitated by the calcination temperature change and Li⁺ ions doping. The lowest lattice symmetry and the best crystallinity of the matrix resulted in the maximum luminescence intensity.

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