摘要
以EDTA为络合剂，采用水热法一步合成了六方相NaYF4：Eu^3＋ 六角微米棱柱，晶粒大小均一，长度为2—3μm，直径为500nm。利用X射线粉末衍射（XRD）、扫描电镜（SEM）、荧光光谱以及透射电子显微镜（TEM）等手段对不同温度煅烧后的产物的物相结构、微观形貌、荧光性能和掺杂状态等进行了分析，结果表明，煅烧温度对NaYF4：Eu^3＋的晶体结构影响不大，仍为六方相晶型，但对晶粒形态和形貌有显著影响，改善了Eu^3＋在基质中的掺杂状态及NaYF4：Eu^3＋的荧光性能，其中在300℃下煅烧，样品仍能保持稳定的六角棱柱形状，可获得最佳的荧光性能。在395nm光激发下，NaYF4：Eu^3＋样品显示出较强的橙色（590nm）和红色（615nm）发光，分别来自于Eu^3＋离子^5D0→^7F1和^5Dc→^7F2的跃迁．
NaYF4 ： Eu^3＋ hexagonal microprisms have been successfully synthesized by one--step hydrothermal route using ethylene diamine tetra--acetic acid （EDTA） as chelator. The NaYF4 ： Eu^3＋ microprisms were uniformly distributed with length of 2--3/an and diameter of about 500 nm The annealed samples at different temperatures were characterized by X--my powder diffraction （XRD）, scanning electron microscopy （SEM）, fluorescence （FL） spectrum measurements and transmission electron microscope （TEM）. The results showed that the annealing temperature had little influence on the crystal structure, which still remained the hexagonal phase confirmed by the XRD analysis, However, the grain size and morphology of NaYF4 ： Eu^3＋ microprisms were strongly affected by the annealing temperature As a result, the doping state of Eu^3＋ in the NaYF4crystals and the corresponding fluorescent properties were greatly improved. By comparison, the sample annealed at 300℃ exhibited the best fluorescent properties due to the stable hexagonal structure The NaYF4 ： Eu^ 3- sample exhibited strong orange （590nm） and red （615nm） emissions under 395 nm laser excitation, which can be assigned to the 5D0→7F1 and 5D0→7F2transition of Eu^3＋ , respectively.
出处
《中国材料科技与设备》
2012年第3期23-25,共3页
Chinese Materials Science Technology & Equipment
基金
浙江省自然科学基金资助项目（Y4090223）
