采用乙二醇/水混合溶剂合成了一维六方相LaPO4∶Tm纳米线,线的宽度为5～10 nm,长度为500～1000 nm;将纳米线于600℃热处理得到单斜相LaPO4∶Tm纳米棒,其长度为100 nm左右,宽度为10～20nm.实验结果表明,所制备的六方相样品不具有发光性质,而单斜相LaPO4∶Tm纳米棒在紫外区和蓝光区均具有较大的发光强度,在260nm激发下样品发射出348nm紫外光,更为重要的是其在356nm激发下能够发出明亮的蓝光(峰值位于454nm).对单斜相样品蓝光区的发光机理的进一步研究表明,基质中的Tm3+吸收356 nm的紫外光处于1 D2能态,然后向低能级跃迁,产生1D2-→3F4 (454 nm)以及1D2-→3H5(520nm)的跃迁,发出蓝光.
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