纳米TiO2基质掺杂稀土离子Er3+和Yb3+的上转换发光特性
납미TiO2기질참잡희토리자Er3+화Yb3+적상전환발광특성
Upconversion luminescence Properties of Er3+ and Yb3+ co-doped TiO2 nanopowders
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