用湿化学共沉淀法制备了掺杂0.5at %Ce的BaHfO3纳米粉体，采用XRD、TEM及TG-DTA等手段分析了粉体合成过程的物相变化及特性；用荧光光度计分析了样品的激发光谱和发射光谱。结果表明：先驱沉淀物经1000℃煅烧2h，合成出多边形貌，分散性良好，粒径尺寸约为30～50nm的BaHfO3:Ce纳米粉体。该材料的激发光谱在332nm、392nm处出现2个激发峰；332nm波长激发的发射光谱主要由两个光谱带组成，其峰值分别位于484nm和531nm，而用392nm波长激发时，只在530nm有一个发射峰。BaHfO3:Ce的发光特性由激活Ce3+的5d→2F5/2和5d→2F7/2宽带跃迁产生，其激发光谱和发射光谱均为宽带谱。
The 0.5at% Ce doped-BaHfO3 nano-powders were synthesized by the co-precipitation method. XRD, TEM, DTA/TG were employed to analyze the phase change and the properties of nano-powders during the calcing process. The excitation and emission spectra were analyzed by the fluorescence photometer. Results show that the average diameter was about 30～50nm with good dispersibility and polygonal in shape after calcining at 1000℃ for 2h. There are two excitation bands at 332 and 392 nm, and two emission bands excited by the 332 nm light, peaking at 484 and 531nm. But there is only one emission band excited by the 392 nm light which peaking at 530 nm, which is corresponding to the 5d →2F5/2 and 5d →2F7/2 transitions of Ce3+ cation, and the excitation and emission spectra were both wide band.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%