稀土钐掺杂浓度对硼硅酸盐玻璃的结构、光致发光及能量传递的影响  

Influence of doping concentration of samarium on the structure,photoluminescence and energy transfer in borosilicate glass

作　　者：乔荫颇[1] QIAO Yin-po(School of Materials Science and Engineering,Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Shaanxi University of Science&Technology,Xi′an 710021,China)

机构地区：[1]陕西科技大学材料科学与工程学院陕西省无机材料绿色制备与功能化重点实验室,陕西西安710021

出　　处：《陕西科技大学学报》2022年第5期138-145,共8页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(51801117)。

摘　　要：发光二极管(LED)器件封装及应用中存在的主要问题使得稀土掺杂光功能玻璃材料成为传统LED封装材料的良好替代.采用高温熔融-冷却方法设计并制备了一系列Sm_(2)O_(3)掺杂改性钙硼硅玻璃材料,并对其结构、组成、光谱特性及发光颜色等与掺杂离子浓度的关系进行了仔细研究.结果表明,Sm掺杂的发光玻璃具有无定形非晶网络结构,Sm-O基团嵌入在玻璃网络结构中作为发光中心,且样品在可见光区可观察到明显的由Sm^(3+)引起的吸收.在404 nm激发下,Sm^(3+)掺杂玻璃样品在565 nm、603 nm、650 nm和712 nm处分别观察到Sm的特征发射,这起源于Sm^(3+)内部的由~4G_(5/2)到~6H_(J/2)(J=5,7,9,11)能级的电子跃迁.随着Sm_(2)Om_(3)掺杂浓度的增加,样品的荧光强度呈现出先增加后降低的浓度猝灭过程,且Sm_(2)O_(3)的猝灭浓度约为1.0 mol%.计算表明,偶极-偶极相互作用是玻璃中能量传递和猝灭的主要机制.总之,样品的光致发光强度、掺杂离子的周围对称性、荧光寿命、颜色坐标等均可由玻璃中掺杂Sm_(2)O_(3)的浓度进行控制和调节,这为扩展红色发光功能玻璃材料在LED上的应用提供了新的思路和途径.The main drawbacks in the packaging and application of light-emitting diode(LED) devices make rare-earth doped optical functional glass become a good candidate for traditional LED packaging.A series of Sm_(2)O_(3) doped modified CaO-B_(2)O_(3)-SiO_(2) glass materials were designed and prepared by the melting-cooling method,and the relationship between the structure,composition,spectral characteristics,luminescence color and the concentration of dopant was studied detailedly.The results showed that the Sm-doped luminescent glass has an amorphous network structure,with the Sm-O group embedded as the luminescence center.Moreover,the Sm-doped sample has an obvious absorption band caused by Sm^(3+)and a high transmittance in the visible region.The characteristic emissions of Sm^(3+)at 565 nm,603 nm,650 nm,and 712 nm were observed in Sm^(3+)-doped glass under 404 nm excitation,which resulted from the electronic transitions from ~4G_(5/2) to ~6H_(J/2)(J= 5,7,9,11) levels in Sm^(3+)ions.With the increase of Sm_(2)O_(3) doping concentration,the fluorescence intensity of the sample first increases and then decreases with a concentration quenching process,and the quenching concentration of Sm_(2)O_(3) is about 1.0 mol%.It is shown that the dipole-dipole interaction is the main mechanism for PL quenching.In conclusion,the photoluminescence intensity,the surrounding symmetry of the doped ions,the fluorescence lifetime and the color coordinates of the samples can be controlled and adjusted by the concentration of doping Sm_(2)O_(3),which provides a new idea and method for the LED application of red-emitting luminescent glass.

关 键 词：钐掺杂 发光玻璃 荧光猝灭 荧光寿命 发光二极管 

分 类 号：O433.4[机械工程—光学工程]