Tm^(3+)/Yb^(3+)共掺碲酸盐玻璃的近红外发光及能量传递机理  

Near-infrared Emission and Energy Transfer Mechanism of Tm^(3+)/Yb^(3+) Codoped Tellurite Glasses

作　　者：徐星辰[1] 周亚训[1] 王森[1] 魏淑林[1] 戴世勋[1] 王训四[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《光子学报》2012年第9期1028-1035,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61178063);浙江省研究生创新科研项目(No.YK2010048);宁波市自然科学基金(No.2010A610172);宁波大学王宽诚幸福基金;胡岚优秀博士基金资助

摘　　要：采用高温熔融法制备了组分为TeO2-ZnO-Na2O的Tm3+离子单掺和Tm3+/Yb3+共掺碲酸盐玻璃,应用Judd-Ofelt理论计算分析了玻璃样品的强度参量Ωt(t=2,4,6),自发辐射跃迁几率A,荧光分支比β和荧光辐射寿命τrad等光谱参量,测量得到了不同Yb3+离子掺杂浓度下玻璃样品的Tm3+离子上转换发光谱.结果显示,在980nm泵浦光激励下玻璃样品发射出强烈的近红外上转换荧光.对Tm3+离子上转换发光分析表明,强烈的Tm3+离子近红外上转换发光主要来自于Yb3+/Yb3+离子间的共振能量传递以及基于单声子和双声子辅助的Yb3+/Tm3+离子间的非共振能量传递过程,并进一步计算得到了声子贡献比和能量传递系数.最后,计算分析了Tm3+∶3 F4→3 H6能级间跃迁的1.8μm波段吸收截面、受激发射截面和增益系数.研究表明,Yb3+/Tm3+共掺TeO2-ZnO-Na2O玻璃可以作为近红外波段固体激光器的潜在增益基质.Tm3+ single doped and Tm3+/Yb3+ codoped tellurite glasses with the composition of TeO2-ZnO-Na2O were prepared by melt-quenching method.The intensity parameters Ωt(t=2,4,6),spontaneous radiative transition rates A,fluorescence branching ratios β and radiative lifetimes τrad of Tm3+ were calculated based on the Judd-Ofelt theory,and the upconversion luminescence of Tm3+ for glass sample with different Yb3+ doping concentration was measured.The results show that the glass sample can emit strong near-infrared upconversion emission under the excitation of 980nm pump light.The analysis of Tm3+ upconversion emission process reveals that the intense near-infrared upconversion luminescence of Tm3+ ions is mainly ascribed to the result of energy transfers: first the resonant energy transfer from Yb3+ to Yb3+ ions,and then followed by one and two phonon-assisted nonresonant energy transfer from Yb3+ to Tm3+ ions.The energy transfer coefficient and phonon contribution for the above energy transfer process were calculated.Furthermore,the 1.8μm band absorption,emission cross-sections and gain coefficient of Tm3+∶3F4→3H6 transitions were calculated and analyzed.The research indicates that Yb3+/Tm3+ codoped TeO2-ZnO-Na2O glass is a promising host material applied for near-infrared band solid laser.

关 键 词：碲酸盐玻璃 Tm3+/Yb3+共掺 能量传递 上转换 

分 类 号：TQ17[化学工程—硅酸盐工业]