1. Hydrothermal synthesis of the intense green photoluminescence of hexagonal phase NaYF4:Yb3+/Er3+ microcrystals
- Author
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Jiao, Yuechao, Gao, Xiaoyong, Lu, Jingxiao, Chen, Yongsheng, He, Wei, Chen, Xianmei, Li, Xinli, and Li, Rui
- Subjects
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PHOTOLUMINESCENCE , *PHASE transitions , *EUROPIUM compounds , *METAL ions , *INORGANIC synthesis , *METAL crystals , *ETHYLENEDIAMINETETRAACETIC acid , *CRYSTAL structure - Abstract
Abstract: Hexagonal phase NaYF4:Yb3+ 20mol%/Er3+ 1mol% microcrystals that exhibit intense green emission were successfully synthesized via a facile hydrothermal method. The factors including the NaF/Ln (Ln=Y+Yb+Er) molar ratio, pH value of the precursor solution, and the ethylenediaminetetraacetic acid (EDTA)/Ln molar ratio, were well studied in the influences on the crystal structures, morphologies, and sizes of final products. The experimental results indicate that the NaF/Ln ratio and pH value play key roles in crystal structure and morphology of the product. Photoluminescence measurements demonstrate that the relative up-conversion photoluminescence intensity of as-prepared products strongly depends on the crystal structures, crystallization degrees, morphologies, and sizes. [Copyright &y& Elsevier]
- Published
- 2013
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