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采用共沉淀法制备了不同Eu3+掺杂浓度的CaWO4荧光粉材料.通过X射线衍射和场发射扫描电镜技术对样品的结构和形貌进行了表征.测量了各样品的激发光谱、发射光谱和荧光衰减曲线, 计算了各样品的部分Judd-Oflet (J-O)参数和5D0 (Eu3+)能级量子效率,以及荧光粉的色坐标, 讨论了样品电荷迁移带相对强度、J-O参数、量子效率与掺杂浓度的依赖关系.对Eu3+掺杂的CaWO4 发光材料的光致发光性质的研究表明,在CaWO4: Eu3+中5D07F2跃迁的616~nm 红色发光能被394.5~nm和465~nm的激发光有效激发,具有近紫外(或蓝光)激发效率高和猝灭浓度大的优点, 有潜力成为高效的近紫外(或蓝光)激发白光发光二极管用红色荧光粉材料.Eu3+ doped CaWO4 phosphors of different concentrations are prepared by a co-precipitation method. The X-ray diffraction patterns and field emission scanning electron microscopy images are investigated. The excitation spectra, emission spectra and the curves of fluorescence decays of the samples are measured. The Judd-Ofelt (J-O) parameters, quantum efficiencies of the 5D0 level of Eu3+ and color coordinates are calculated. The dependences of relative intensity of charge transfer band, J-O parameter and quantum efficiency on doping concentration are discussed. The photoluminescence properties of Eu3+ doped CaWO4 luminescent material are studied. The results indicate that the 616 nm red emission of Eu3+5D07F2 transition can be effectively excited by 394.5 nm and 465 nm with high excitation efficiency and the concentration quenching is high. So the CaWO4: Eu red phosphor may have a potential application for white light emitting diode.
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Keywords:
- concentration dependence /
- red phosphors /
- Eu3+ /
- tungstate
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[2] Wang X Y, Lin H, Yang D L, Lin L, Pun E Y B 2007 J. Appl. Phys. 101 113535
[3] Tanabe S, Hayashi H, Hanada T, Onodera N 2002 Opt. Mater. 19 343
[4] Chen B, Jang K, Lee H, Jayasimhadri M, Cho E, Yi S, Jeong J 2009 J. Phys. D: Appl. Phys. 42 105401
[5] Kodaira C A, Brito H F, Teotonio E E S, Felinto M C F C, Malta O L, Brito G E S 2004 J. Braz. Chem. Soc. 15 890
[6] Jia P Y, Liu S M, Yu M, Luo Y, Fang J, Lin J 2006 Chem. Phys. Lett. 424 358
[7] Feng X H, Meng Q Y, Chen B J, Lü S C, Sun J T, Ding H Y 2011 J. Nanosci. Nanotechnol. 11 9780
[8] Tang H X, Lü S C 2011 Acta Phys. Sin. 60 037805 (in Chinese) [唐红霞, 吕树臣 2011 60 037805]
[9] Ren Y D, Lü S C 2011 Acta Phys. Sin. 60 087804 (in Chinese) [任艳东, 吕树臣 2011 60 087804]
[10] Di W H, Wang X J, Chen B J, Lu S Z, Zhao X X 2005 J. Phys. Chem. B 109 13154
[11] He C, Guan Y F, Yao L Z, Cai W L, Li X G, Yao Z 2003 Mater. Res. Bull. 38 973
[12] Huang Y H, Jiang D L, Zhang J X, Lin Q L 2010 Acta Phys. Sin. 59 300 (in Chinese) [黄毅华, 江东亮, 张景贤, 林庆玲 2010 59 300]
[13] Jiang B X, Huang T D, Wu Y S, Liu W B, Pan Y B, Feng T, Yang Q H 2008 Chin. Phys. B 17 3407
[14] Kodaira C A, Brito H F, Malta O L, Serra O A 2003 J. Lumin. 101 11
[15] Zhao X X, Wang X J, Chen B J, Meng Q Y, Di W H, Ren G Z, Yang Y M 2007 Journal of Alloys and Compounds 433 352
[16] Zhao X X, Wang X J, Chen B J, Meng Q Y, Yan B, Di W H 2007 Opt. Mater. 29 1680
[17] Judd B R 1962 Phys. Rev. 127 750
[18] Ofelt G S 1962 J. Chem. Phys. 37 511
[19] Ray S, Pramanik P, Singha A, Roy A 2005 J. Appl. Phys. 97 094312
[20] Nishimura G, Kushida T 1988 Phys. Rev. B 37 9075
[21] Reisfeld R, Greenberg E, Brown R N, Drexhage M G, J\varphi rgensen C K 1983 Chem. Phys. Lett. 95 91
[22] Tian Y, Qi X H, Wu X W, Hua R N, Chen B J 2009 J. Phys. Chem. C 113 10767
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[1] Gilliland G D, Powell R C, Esterowitz L 1988 Phys. Rev. B 38 9958
[2] Wang X Y, Lin H, Yang D L, Lin L, Pun E Y B 2007 J. Appl. Phys. 101 113535
[3] Tanabe S, Hayashi H, Hanada T, Onodera N 2002 Opt. Mater. 19 343
[4] Chen B, Jang K, Lee H, Jayasimhadri M, Cho E, Yi S, Jeong J 2009 J. Phys. D: Appl. Phys. 42 105401
[5] Kodaira C A, Brito H F, Teotonio E E S, Felinto M C F C, Malta O L, Brito G E S 2004 J. Braz. Chem. Soc. 15 890
[6] Jia P Y, Liu S M, Yu M, Luo Y, Fang J, Lin J 2006 Chem. Phys. Lett. 424 358
[7] Feng X H, Meng Q Y, Chen B J, Lü S C, Sun J T, Ding H Y 2011 J. Nanosci. Nanotechnol. 11 9780
[8] Tang H X, Lü S C 2011 Acta Phys. Sin. 60 037805 (in Chinese) [唐红霞, 吕树臣 2011 60 037805]
[9] Ren Y D, Lü S C 2011 Acta Phys. Sin. 60 087804 (in Chinese) [任艳东, 吕树臣 2011 60 087804]
[10] Di W H, Wang X J, Chen B J, Lu S Z, Zhao X X 2005 J. Phys. Chem. B 109 13154
[11] He C, Guan Y F, Yao L Z, Cai W L, Li X G, Yao Z 2003 Mater. Res. Bull. 38 973
[12] Huang Y H, Jiang D L, Zhang J X, Lin Q L 2010 Acta Phys. Sin. 59 300 (in Chinese) [黄毅华, 江东亮, 张景贤, 林庆玲 2010 59 300]
[13] Jiang B X, Huang T D, Wu Y S, Liu W B, Pan Y B, Feng T, Yang Q H 2008 Chin. Phys. B 17 3407
[14] Kodaira C A, Brito H F, Malta O L, Serra O A 2003 J. Lumin. 101 11
[15] Zhao X X, Wang X J, Chen B J, Meng Q Y, Di W H, Ren G Z, Yang Y M 2007 Journal of Alloys and Compounds 433 352
[16] Zhao X X, Wang X J, Chen B J, Meng Q Y, Yan B, Di W H 2007 Opt. Mater. 29 1680
[17] Judd B R 1962 Phys. Rev. 127 750
[18] Ofelt G S 1962 J. Chem. Phys. 37 511
[19] Ray S, Pramanik P, Singha A, Roy A 2005 J. Appl. Phys. 97 094312
[20] Nishimura G, Kushida T 1988 Phys. Rev. B 37 9075
[21] Reisfeld R, Greenberg E, Brown R N, Drexhage M G, J\varphi rgensen C K 1983 Chem. Phys. Lett. 95 91
[22] Tian Y, Qi X H, Wu X W, Hua R N, Chen B J 2009 J. Phys. Chem. C 113 10767
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