| Yb3+掺杂浓度对LaF3晶相及其上转换光谱的影响 |
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| 引用本文： | 兰民,王丽丽. Yb3+掺杂浓度对LaF3晶相及其上转换光谱的影响[J]. 中国稀土学报, 2012, 30(1): 68-72 |
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| 作者姓名： | 兰民 王丽丽 |
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| 作者单位： | 长春工业大学基础科学学院,吉林长春,130012 |
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| 基金项目： | 吉林省自然科学基金(201215120)资助 |
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| 摘 要： | LaF3微米晶的晶相(斜方相和六角相)及其上转换发光光谱可以通过精确调节Yb3+的摩尔掺杂浓度来控制。利用简单的水热法合成了Yb3+和Tm3+共掺杂的LaF3,YF3和NaYF4三种不同基质的氟化物纳米晶。XRD分析表明,当Tm3+的掺杂浓度不变,仅Yb3+的摩尔掺杂浓度从10%提高到20%,就可以使基质结构由六角相过渡到斜方相。实验结果表明,具有较大离子半径的稀土离子由于增强的偶极化率,更容易使电子云产生畸变,有利于基质斜方相结构的形成。
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| 关 键 词： | 晶体场 上转换 氟化物 稀土 |
Effect of Ions Concentration of Yb3+ on Crystal Structure and Upconversion Luminescence of LaF3 Microcrystals |
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| Lan Min , Wang Lili. Effect of Ions Concentration of Yb3+ on Crystal Structure and Upconversion Luminescence of LaF3 Microcrystals[J]. Journal of the Chinese Society of Rare Earths, 2012, 30(1): 68-72 |
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| Authors: | Lan Min Wang Lili |
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| Affiliation: | (School of Basic Sciences,Changchun University of Technology,Changchun 130012,China) |
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| Abstract: | The LaF3 microcrystals could be rationally tuned inphase(orthorhombic or hexagonal) and upconversion emission spectra through use of trivalent ytterbium dopant ions introduced at precisely defined concentrations.Tm3+/Yb3+ codoped LnF3(Ln=Y,La) and NaYF4 microcrystals were synthesized using a simple hydrothermal method.XRD analysis of Tm3+/Yb3+ codoped LaF3 microcrystals showed that 20% Yb3+ doping was sufficient for hexagonal LaF3 microparticles to crystallize completely in the orthorhombic phase.Consequently,the results approved that the lanthanides with large ionic radii exhibited a high tendency towards electron cloud distortion owing to increased dipole polarizability,and thus favored the orthorhombic structures. |
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| Keywords: | crystal field upconversion fluoride rare earths |
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