【作者】 江青云； 李晨霞； 叶仁广； 华有杰； 徐时清；

【Author】 Jiang Qingyun Li Chenxia Ye Rengguang Hua Youjie Xu Shiqing (College of Optical and Electronic Technology,China Jiliang University,Hangzhou 310018,China)

【机构】 中国计量学院光学与电子科技学院；

【摘要】 采用高温熔融法制备了一种新型的白光发光Ce³⁺,Tb³⁺共掺BaYF₅微晶玻璃。测试了微晶玻璃的X射线衍射图谱（XRD）、激发光谱和发射光谱。X射线衍射图谱表明玻璃基质中析出BaYF₅纳米晶相,并利用Scherrer公式计算得到BaYF₅晶粒大小约为25 nm。在近紫外光（338nm）激发下,可以观察到蓝光（429nm）宽带发光,对应Ce³⁺的5d→²F_5/2和5d→²F_7/2能级跃迁;同时还观察到蓝光（483nm）,绿光（542nm）,橙光（582nm）和红光（620nm）发光,分别对应于Tb³⁺的⁵D₄→⁷F₆,⁵D₄→⁷F₅,⁵D₄→⁷F₄,⁵D₄→⁷F₃能级跃迁;与玻璃相比,微晶玻璃的发光强度显著增强。通过调节Ce³⁺和Tb³⁺离子掺杂浓度,系统分析了Ce³⁺和Tb³⁺离子之间的能量传递。当Ce³⁺和Tb³⁺的摩尔掺杂浓度为2%和10%时,得到的微晶玻璃的色坐标为（0.27,0.29）。研究结果表明:Ce³⁺/Tb³⁺掺杂的BaYF₅微晶玻璃是白光LED的一种潜在基质材料。更多还原

【Abstract】 A new Ce³⁺/Tb³⁺.Co-doped BaYF₅ glass ceramics were prepared by high temperature melting. The X-ray diffraction spectrum,excitation spectrum and emission spectrum were measured.The X-ray diffraction spectrum indicated the existing of BaYF₅ nanocrystalline phase in the glass matrix.Based on the Scherrer equation,the average size about 25 nm of BaYF₅ nanocrystalline was calculated.The intense blue emission band（429nm） assigned to 5d→²F₅/2 and 5d→²F_7/2 transition of Ce³⁺ and blue emission（483nm）,green emission（542nm）,orange emission（582nm） and red emission（620nm） assigned to ⁵D₄→⁷F₆,⁵D₄→⁷F₅,⁵D₄→⁷F₄,⁵D₄→⁷F₃ transition of Tb³⁺ ions respectively are simultaneously observed at room temperature under 338nm excitation in the glass ceramics;The emission luminescence intensity increased significantly compared with the as-made glass.The energy transfer between Ce³⁺ and Tb³⁺ was analysised systematically by adjusting the doping density of Ce³⁺ and Tb³⁺ ions:When the molar concentration was 2%and 10%,the chromarisity coordinatc phorsphor is measured to be（0.27,0.29）. The results of.the study indicate that:Ce³⁺ / Tb³⁺ co-doped BaYF₅ glass ceramics was a potential white LED matrix material.更多还原