CaF_2对CaO-CaF_2-B_2O_3-SiO_2:Sm_2O_3玻璃的光致发光增强效应

Enhanced Photoluminescence Properties of CaF_2 in CaO-CaF_2-B_2O_3-SiO_2 Glass Doped with Sm_2O_3

用高温熔融法制备了掺杂Sm_2O_3的CaO-CaF_2-B_2O_3-SiO_2(CFBS:Sm)发光玻璃材料,并借助X射线衍射(XRD)谱、傅里叶变换红外(FTIR)光谱以及光致发光(PL)光谱等分析手段研究了玻璃基体中CaF_2的摩尔分数及其结构、红外透过性能以及荧光性能的关系.XRD和FTIR测试表明,玻璃基体中引入CaF_2并未引起非晶结构的变化但其红外透过峰发生移动.光谱学测试表明,CFBS:Sm发光玻璃在404 nm波长激发下出现对应于Sm^(3+)离子位于566、603和650 nm的特征荧光峰,其发光颜色为橙红色(x=0.531,y=0.371).此外,随着玻璃基体中CaF_2摩尔分数的增加,CFBS:Sm发光玻璃的荧光发射强度、荧光寿命(Sm^(3+)的~4G_(5/2)能级)和荧光量子效率也表现出增大的趋势.这种CFBS:Sm发光玻璃中荧光发射强度和荧光寿命的提高主要是由于玻璃基体中的CaF_2替代CaO引起基体相互作用和声子能量降低、无辐射跃迁减弱造成的.

Aseries of luminescent glass composed of CaO-CaF2-B2O3-SiO2 doped with samariumoxide （CFBS： Sm） were prepared. The structure, infrared transmittance and fluorescent properties of the samples were investigated by X-ray diffraction （XRD）, Fourier transforminfrared （FTIR） spectroscopy and photoluminescence （PL） measurements, respectively. The XRD patterns of the CFBS：S msamples showed that the glass matrix had a non-crystalline structure, while the FTIR spectra exhibited shifts of absorption wavelength sensitive to the structure and function of the samples. The PL spectra of the CFBS：Smglasses showed the characteristic emission of Sm3＋ centered at 566, 603 and 650 nmunder 404 nmexcitation, and their luminescence color was red-orange （x=0.531, y=0.371）. Furthermore, the intensity of emission and fluorescent lifetime of Sm3＋ at 603 nm （4G5/2） increased with the molar ratio of CaF2 in the glass samples. The enhanced intensity of emission, fluorescent lifetime and quantumefficiency with increasing molar ratio of CaF2 may result fromthe reduction of phonon energy in the CFBS：S mglass because some CaF2 substitutes CaO in the glass matrix.