近紫外基白光LEDs用NaY(MoO_4)_2:Eu^(3+)材料的发光特性  

Luminescence properties of NaY(MoO_4)_2:Eu^(3+) for near-UV based white LEDs

作　　者：田少华[1] 

机构地区：[1]中国传媒大学理工学部理学院,北京100024

出　　处：《光电子．激光》2015年第10期1942-1946,共5页Journal of Optoelectronics·Laser

基　　金：中国传媒大学理科基金(132014XNG1467)资助项目

摘　　要：采用固相法于550℃灼烧4h,合成了Eu3+单掺杂的NaY(MoO4)2材料,研究了材料的发光特性。X射线衍射(XRD)结果显示,掺杂少量杂质的材料仍为纯相的NaY(MoO4)2。以393nm波长近紫外光作为激发源时,NaY(MoO4)2:Eu3+可以发射主峰位于616nm波长的红色光,对应Eu3+的5D0-7F2跃迁发射。研究发现,增大Eu3+掺杂量时,对应材料的发射强度会逐渐增大,但是未发现浓度猝灭现象,通过相应的衰减曲线解释了此结果。测量不同Eu3+掺杂量下,NaY(MoO4)2:Eu3+的色坐标结果显示,色坐标基本不变,位于红色区域。上述结果表明,NaY(MoO4)2:Eu3+在白光LEDs领域有一定的应用潜力。A series of single Eua＋ activated NaY（MoO4 ）2 were synthesized by a solid state reaction at 550 ℃ for 4 h,and their luminescent properties are investigated. Phase formation is determined by X-ray diffraction （XRD） in a Bruker AXS I）8 advanced automatic diffractometer （Bruker Co. ,German） with Ni-filtered Cu Kal radiation （;t=0. 154 nm）. Steady time resolved luminescence spectra, and excitation and emission spectra are detected by a fluorescence spectrophotometer （Hitachi F-4600）. Commission International de IIEclairage （CIE） chromaticity coordinates of samples are measured by a PMS-80 spec- tra analysis system. The X-ray powder diffraction results show that there has no crystalline phase other than NaY（MoO4 ）2. NaY（MoO4 ）2：Eu3＋ can create red emission under the 393 nm excitation, and the prominent luminescence in red （616 nm） is due to the 5 Do- 7 F2 transition of Eu3＋. The emission inten- sities of Eu3＋ in NaY（MoO4）2 enhance with the increase of the impurity concentration,there is no con- centration quenching effect, and the phenomena are proved by the decay curves of Eua＋. Moreover, when tuning the Eu3 ＋ doping content, the CIE chromaticity coordinates of NaY（MoO4 ）2 ：Eu3 ＋ are measured, and the corresponding results present that they locate in the red region. The results indicate that the phosphors may have the potential applications in white light emitting diodes.

关 键 词：发光 Eu3+ NaY(MoO4)2 

分 类 号：O644[理学—物理化学] O482.31[理学—化学]