Bi_2O_3-B_2O_3-RE_2O_3(RE=Ce,Tb)玻璃的光学带隙  

Optical band gap of Bi_2O_3-B_2O_3-RE_2O_3(RE=Ce,Tb) glasses

作　　者：殷海荣[1] 刘盼[1] 郭宏伟[1] 董继先[2] 吴阳[1] 莫祖学[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021 [2]陕西科技大学机电工程学院,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2014年第1期49-52,共4页Journal of Shaanxi University of Science & Technology

基　　金：国际科技合作计划项目(2009DFR50520);陕西省咸阳市科技局科研计划项目(2012K11-14);陕西科技大学博士科研启动基金项目(BJ12-01)

摘　　要：采用熔融法制备了Bi2O3-B2O3-RE2O3(RE=Ce,Tb)玻璃,根据Urbach公式和Tauc方程分别计算了含不同种类稀土玻璃的Urbach能及光学带隙,并探究了Urbach能与光学带隙的关系.结果表明:增加稀土离子,玻璃中非桥氧键增多,玻璃的结构疏松,电子跃迁所需的能量降低,Urbach能降低;随着极化率增加,玻璃的键强降低,吸收边增加,光学带隙减小,且光学带隙随着Urbach能的减小线性降低.Bi2 O3-B2 O3-RE2 O3 （RE= Ce ,Tb） glasses were prepared by melting method .Ur-bach energy and optical band gap of different rare earth ions glasses were calculated by classi-cal Urbach formula and Tauc equation ,and explore the relationship of Urbach energy and op-tical band gap .The results showed that the amount of non-bridging oxygen bond increases with the increase of rare earth ions ,which loose structure of glass ,and cause the decrease of electron transition energy and Urbach energy .As the polarization rate of the glasses increa-ses ,which increased the absorption edge and decreased the bond strength and optical band gap;meanwhile the optical band gap decreased linearly with the decrease of Urbach energy .

关 键 词：光学带隙 吸收边 发光玻璃 

分 类 号：O64[理学—物理化学]