Tunable luminescence properties of CaIn2O4:Eu3+ phosphors
Tunable luminescence properties of CaIn2O4:Eu3+ phosphors
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DOI：
10.1021/jp074868o
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发表时间：
2007-11-08
影响因子：
3.7
通讯作者：
Lin, Jun
中科院分区：
文献类型：
--
作者：
Liu, Xiaoming;Li, Chunxia;Lin, Jun
采用Pechini溶胶-凝胶法制备了CaIn_2 O_4：Eu ~（3+）荧光粉。利用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、光致发光（PL）、阴极发光（CL）光谱以及寿命测试等手段对样品进行了表征。XRD结果表明，样品在800 ℃时开始结晶，并且结晶度随着退火温度的升高而增加。FE-SEM图像表明，CaIn 2 O 4：Eu 3+样品由细小的球形晶粒组成，晶粒尺寸约为200-400 nm。在紫外光和低压电子束激发下，CaIn 2 O 4：Eu 3+荧光粉呈现出Eu 3+（（DJ-7 FJ '）-D-5 J，J ' = 0，1，2，3跃迁）的特征发射。通过调节Eu ~（3+）的掺杂浓度，可以实现发光颜色从白色到橙子再到红色的调谐。提出了相应的发光机理。
CaIn2O4:Eu3+ phosphors were prepared by a Pechini so-gel process. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), photoluminescence (PL), cathodoluminescence (CL) spectra as well as lifetimes were utilized to characterize the samples. The XRD results reveal that the samples begin to crystallize at 800 degrees C, and the crystallinity increases upon raising the annealing temperature. The FE-SEM images indicate that the CaIn2O4:Eu3+ samples consist of fine and spherical grains with size around 200-400 nm. Under the excitation of ultraviolet light and low-voltage electron beams, the CaIn2O4:Eu3+ phosphors show the characteristic emissions of Eu3+ ((DJ-7FJ ')-D-5 J, J ' = 0, 1, 2, 3 transitions). The luminescence color can be tuned from white to orange to red by adjusting the doping concentration of EU3+. The corresponding luminescence mechanisms have been proposed.