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 VO₄^3-, 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.

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