Sm³⁺- doped silica glass co-doped with CdS nanoparticles have been prepared by sol-gel method. FTIR spectra of the samples at different annealing temperatures show the gradual removal of hydroxyl group. XRD pattern shows crystalline nature of the silica host along with CdS peak. The optical absorption and fluorescence properties have been investigated using Judd-Ofelt theory. The Judd-Ofelt intensity parameters have been obtained from the absorption spectrum following the trend Ω₂ > Ω₄ > Ω₆ and the large value of Ω₂ indicates covalency of the rare earth bonding. Under excitation with 370 nm, photoluminescence peaks have been observed in the green, yellow, orange and red region as a result of radiative relaxation from the ⁴G_5/2 state.


中文翻译：

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溶胶-凝胶石英玻璃中共掺杂的Sm3 +和CdS的光谱性质

采用溶胶凝胶法制备了掺有CdS纳米粒子的Sm ³⁺掺杂石英玻璃。样品在不同退火温度下的FTIR光谱显示羟基的逐渐去除。XRD图谱显示了二氧化硅主体的晶体性质以及CdS峰。使用Judd-Ofelt理论研究了光吸收和荧光性质。应用Judd-Ofelt理论强度参数已经从吸收光谱以下的趋势得到Ω ₂ >Ω ₄ >Ω ₆和Ω的大值₂表示稀土键的共价。在370 nm激发下，由于⁴ G _5/2态的辐射弛豫，在绿色，黄色，橙色和红色区域中观察到了光致发光峰。