Eu^3＋，Li^＋共掺杂ZnO：Zn荧光粉的制备及发光性质  

Synthesis and optical properties of Eu^(3+),Li^+-codoped ZnO:Zn phosphors

作　　者：陈力[1] 张家骅[1] 张霞[1] 骆永石[1] 吕少哲[1] 任新光[1] 王笑军[1,2] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所激发态物理重点实验室,吉林长春130033 [2]美国南乔治亚大学物理系,Statesboro,乔治亚30460

出　　处：《光电子．激光》2008年第5期632-635,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(10504031,10574128);国家“973”资助项目(2006CB601104);国家“863”资助项目(2006AA03A138)

摘　　要：在还原气氛下利用高温固相反应法制备了Eu3+,Li+共掺杂的ZnO:Zn荧光粉。在近紫外光激发基质条件下,该荧光粉材料具有强的来自Eu3+的4f组态内跃迁线状发射及来自基质缺陷相关的绿色可见宽带发射。测量了稳态光谱,漫反射及时间分辨光谱以研究该材料的发光性质及基质向稀土离子的能量传递过程。在还原气氛下因在导带下形成了一系列浅施主能级,暂时储存激发能,施主中心浓度增加使得基质向稀土离子的能量传递效率增强。通过与纯Eu2O3粉末的光谱对比分析,确定了在此材料体系中存在处于两种局域环境的Eu3+。由于在近紫外区的强且有效的吸收,此材料有望成为应用于近紫外激发发光二极管的新型荧光粉。Eu^3＋ -Li^＋ -codoped ZnO：Zn phosphor with intense sharp line emissions from Eu^3＋ 4f intra-configurational transitions and broad green emission band from defect-related luminescent centers upon indirect exaltation of near-UV light has been synthesized under reducing condition. Steady-state and time-resolved photoluminescence and diffuse reflectance spectra are measured to investigate properties of the luminescence. The results suggest that there is a prominent energy transfer from ZnO host to Eu^3＋ ions. A series of shallow donor energy levds as temporary storage of excitation energy play a crudal role on this energy transfer process. The energy transfer effidency can be enhanced by these additional shallow donors. Two kinds of local environments for Eu^3＋ in Eu^3＋ -Li^＋ -codoped ZnO：Zn are distinguished based on the emission and excitation spectra in comparison with pure Eu2 O3. Such phosphor will be a promising candidate employed in the white light-emitting diodes based on the near-UV pumping.

关 键 词：近紫外光激发发光二极管 能量传递 稀土离子掺杂 半导体光致发光 ZNO 荧光粉 

分 类 号：TB44[一般工业技术]