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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