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Low temperature Synthesis of nanoparticle GdVO4:Eu3+ by solvothermal method
|Jong Won Chung 1, Hyun Kyoung Yang 1, Byung Kee Moon 1, Byung Chun Choi 1, Jung Hyun Jeong 1, Soung Soo Yi 2, Jung Hwan Kim 3|
1. Department of Physics, Pukyong National Univeristy, 599-1 Daeyeon-Dong Nam-Gu, Busan 608-737, Korea, South
Gadolinium orthovanadate (GdVO4) is an attractive host lattice for several lanthanide ions to produce efficient phosphors emitting a variety of colors. Recently, GdVO4:Eu3+ phosphor has been considered as a candidate phosphor for flat panel displays (FPDs) because of its good color purity. GdVO4:Eu3+ is an interesting red-emitting material; it’s most important application would be as a phosphor of flat panel displays. Because of a string absorption to ultraviolet light by GdVO4, an effective of Eu3+ by the 450 nm strong emission of VO43-, GdVO4:Eu3+ is a highly efficient red-emitting material. Eu3+ doped GdVO4 phosphors were prepared solvothermal reaction method. This method which offers molecular or nano-level mixing of constituents leading to chemical homogeneity is very useful method to synthesize novel nano-size compounds with high crystallinity. The doping concentration of Eu3+ was 3 mol% and Gd(AcAc)3, Eu(AcAc)3, and VO(OR)3 were used as starting materials and they were dissolved in 2-Propanol. Stoichiometric amounts of above solutions were mixed and the solution was initially heated to 230 oC in air and continuously stirred in a mixture for 10h. The samples were calcined at 570 oC in autoclave for 5h and then sintered at various sintering temperatures in autoclave for 3h. The room temperature PL spectra of GdVO4:Eu3+ nanophosphors were four emissions at 611, 615, 619 and 595 nm of Eu3+ ion when excited by 312 nm light. Their crystalline structures, surface morphologies and phase transitions were investigated for the samples prepared at various annealing processes by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), respectively. And luminescent characteristics were studied by measuring photoluminescence (PL) and cathodoluminescence (CL). The purpose of this study is to compare the luminescence characteristics of GdVO4:Eu3+ phosphors which were synthesized at different sintering temperatures.
Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Jung Hyun Jeong
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-12 08:08 Revised: 2009-06-07 00:44