采用熔融淬冷法制备了不同浓度 Ce3+离子掺杂的20Li2O-5MgO-20Al2O3-55SiO2玻璃闪烁材料。采用 X 射线衍射(XRD)、高分辨透射电镜(HRTEM)技术、密度检测等方法研究了玻璃的微观结构随 Ce3+离子掺杂浓度的变化规律，采用荧光分光技术检测了玻璃的紫外光致激发光谱(PLE)、发射光谱(PE)。研究结果表明：在不对称的晶体场作用下， Ce3+离子5d能级被劈裂为5个组分；随着玻璃基质内Ce3+离子掺杂浓度增大，玻璃的非晶化程度加深；5d能级的劈裂宽度随之增大，由此导致激发带向低能量端展宽、发射光谱明显红移； Ce3+离子的荧光发射强度随Ce3+离子掺杂浓度先升高、后降低，浓度猝灭过程成为其荧光发射效率降低的主要原因。
20Li2O-5MgO-20Al2O3-55SiO2glass doped with different concentrations ofCe3+ions was synthesized by using melt-quenching method. The glass density as a function of Ce3+ ions doping concentration was tested by Ar-chimedes’ method. The structural characteristics of Ce3+-doped 20Li2O-5MgO-20Al2O3-55SiO2were detected by using X-rays diffraction (XRD), high resolution transmission electron microscope (HRTEM) techniques. The photolumines-cence excitation (PLE) and emission (PL) spectra were recorded in a spectrofluorimeter by photon counting techniques. Results showed that 5d energy level of Ce3+ ion was splitted to five components under the strong crystal filed sur-rounding Ce3+ ions. The higher the doping concentration of Ce3+ ions, the higher the degree of non-crystalline con-figuration of lithium magnesium aluminosilicate glass was. With the increase of the degree of non-crystalline configu-ration, the splitting width of 5d energy level increased, resulting in the redshift of excitation and emission spectra ap-parently. The PL emission intensity first increased, and then decreased with the increase of Ce3+ ions doping concen-tration. The concentration quenching processes were found to be the key reason for the reduction of the PL emission efficiency.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%