微波辐射法快速合成Dy^(3+)激活的SrMoO_4黄色荧光粉  

Rapid synthesis of Dy^(3+) -doped SrMoO_4 yellow emitting phosphors by microwave radiation method

作　　者：翟永清[1] 李瑞方[1] 胡志春[1] 马健[1] 郑强[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《功能材料》2014年第17期17136-17139,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20675023)

摘　　要：采用微波辐射法快速合成了Dy3+掺杂SrMoO4黄色荧光粉。运用X射线衍射仪及荧光分光光度计对该荧光粉的物相结构及发光性能等进行了分析和表征。结果表明,所得的样品为四方晶系、白钨矿结构的钼酸盐,空间群为I41/a。样品的激发光谱是由位于200~340 nm的一个宽带和340~500 nm的一系列尖峰构成。宽带吸收与Mo-O及Dy-O的电荷转移过程有关,最强峰位于284 nm左右。340 nm以后的吸收峰是由于Dy3+离子的f-f跃迁引起的。发射光谱由两个窄带组成:主峰位于576 nm处的窄带属于Dy3+离子的4F9/2→6H13/2电偶极跃迁发射;另一个窄带位于480 nm左右,属于Dy3+离子的4F9/2→6H15/2跃迁发射,前者的强度远大于后者,因而,样品发黄光。同时,考察了Dy3+浓度、反应时间等对样品发光性能的影响。Dy3 ＋ doped SrMoO 4 yellow-emitting phosphors were synthesized rapidly by microwave radiation method.The phase structure and luminescence properties of as-synthesized SrMoO 4 ∶Dy3 ＋ were characterized and investigated by X-ray diffraction and fluorescence spectrophotometer,respectively.The results indicate that the obtained products are pure monazite type molybdates with tetragonal system,belonging to space group I4 1/a. The excitation spectrum consists of a broad band in range of 200-340 nm and a series of sharp peaks between 340 and 500 nm.The broad band with a maximum at 284 nm was ascribed to the charge-transfer band （CTB）between Mo-O and Dy-O;the sharp peaks belong to f-f transition of Dy3 ＋ .The emission spectrum contains two narrow bands：the narrow band with main peak at around 576 nm originated from the electric dipole transition of 4 F9/2 →6 H 1 3/2 of Dy3 ＋ ,and the other at around 480 nm originated from 4 F9/2 →6 H 1 5/2 transition of Dy3 ＋ .The intensity of the former was much stronger than that of the latter,therefore,the samples show yellow emitting under the excitation of ultraviolet light.Meanwhile,the influences of doped-Dy3 ＋ concentration and reaction time on luminescent properties of as-prepared samples were also discussed.

关 键 词：白光LED SrMoO4∶Dy3+ 黄色发光材料 微波辐射法 

分 类 号：O482.31[理学—固体物理]