Luminescent Properties of Y2(MoO4)3:Eu3+ Red Phosphors with Flowerlike Shape Prepared via Coprecipitation Method

Novel Y2(MoO4)3:Eu3+ red phosphors were synthesized through a simple coprecipitation process and characterized by using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and fluorescent spectrophotometry. The results of XRD and FE-SEM show that resultant samples are single phase and have flowerlike shape. In the excitation spectra of Y2(MoO4)3:Eu3+ phosphors, by monitoring 616 nm, the charge transfer bands (CTB) of Eu3+→O2- and Mo6+→O2- centering at around 264 and 310 nm can be observed, respectively. Moreover, the intensity ratio of charge transfer band between Eu3+→O2- and Mo6+→O2- increases with increasing Eu3+ ions doping concentration. The characteristic red emission at around 616 nm of Eu3+ ions is also observed, ascribed to the 5D0→7F2 transition of Eu3+ ions, and the optimal doping concentration is 12 mol %. Finally, the Ωλ (λ = 2 and 4) intensity parameters and Huang−Rhys factor were also calculated according to Judd−Ofelt theory and multiphonon relaxation theory, res...

[1]  G. Blasse,et al.  Structure and Eu3+-fluorescence of lithium and sodium lanthanide silicates and germanates , 1967 .

[2]  G. Blasse.  On the Eu3+ Fluorescence of Mixed Metal Oxides. IV. The Photoluminescent Efficiency of Eu3+‐Activated Oxides , 1966 .

[3]  S. Neeraj,et al.  Novel red phosphors for solid-state lighting: the system NaM(WO4)2−x(MoO4)x:Eu3+ (MGd, Y, Bi) , 2004 .

[4]  Y. Do,et al.  Optical Properties of Potassium Europium Tungstate Phosphors , 2000 .

[5]  H. Brito,et al.  Luminescence investigation of Eu 3+ ion in the RE 2 (WO 4 ) 3 matrix ( RE=La and Gd) produced using the Pechini method , 2003 .

[6]  M. Tonelli,et al.  Effect of cerium codoping in Er3+,Ce3+:NaLa(MoO4)2 crystals , 2005 .

[7]  S. Ribeiro,et al.  Eu3+ and Gd3+ spectroscopy in fluoroindate glasses , 1994 .

[8]  Xiaojun Wang,et al.  Luminescent properties of Eu3+ doped α-Gd2(MoO4)3 phosphor for white light emitting diodes , 2007 .

[9]  R. N. Brown,et al.  Fluorescence of europium(III) in a flouride glass containing zirconium , 1983 .

[10]  Jiahua Zhang,et al.  Hydrothermal synthesis and photoluminescent properties of ZnWO4 and Eu3+-doped ZnWO4 , 2002 .

[11]  H. Inoue,et al.  Fluorescence properties of fluorozirconate glasses containing Eu3+ ions , 1993 .

[12]  Ru‐Shi Liu,et al.  Eu substitution and particle size control of Y2O2S for the excitation by UV light emitting diodes , 2005 .

[13]  E. R. Birnbaum,et al.  Many-body nonradiative energy transfer in a crystalline europium (III) EDTA complex , 1995 .

[14]  Chongfeng Guo,et al.  Luminescent properties of R2(MoO4)3:Eu3+ (R = La, Y, Gd) phosphors prepared by sol-gel process , 2008 .

[15]  K. Binnemans,et al.  Influence of dipicolinate ligands on the spectroscopic properties of europium(III) in solution , 1997 .

[16]  U. Rodríguez-Mendoza,et al.  Synthesis, electrical properties, and optical characterization of Eu3+-doped La2Mo2O9 nanocrystalline phosphors , 2004 .

[17]  R. Mahiou,et al.  A spectroscopic study of the vaterite form YBO3:Eu3+processed by sol gel technique , 2003 .

[18]  B. Yan,et al.  Hydrothermal synthesis and luminescence of CaMO4:RE3+ (M=W, Mo; RE=Eu, Tb) submicro-phosphors , 2008 .

[19]  A. Speghini,et al.  Variation of Fluorescence Lifetimes and Judd-Ofelt Parameters between Eu3+ Doped Bulk and Nanocrystalline Cubic Lu2O3 , 2004 .

[20]  Yi Chen,et al.  Preparation and Characterization of Ultrafine Rare Earth Molybdenum Complex Oxide Particles , 1998 .

[21]  U. Varadaraju,et al.  Intense Red Phosphor for White LEDs Based on Blue GaN LEDs , 2006 .

[22]  G. Blasse,et al.  The critical concentration for quenching of the Eu3+ luminescence in some Gd3+:Eu3+ systems , 1986 .