Preparation and Luminescent Properties of GdPO4∶Tb3+Phosphors
Rare earth Tb3+doped gadolinium phosphate(GdPO4)green phosphor is a potential phosphor for white LED,while the preparation by conventional hydrothermal method has some problems,such as long reaction time and low doping amount of Tb3+.A series of Gd1-r PO4∶xTb3+(x=0,1％,5％,11％,13％,15％,17％,19％)samples were prepared by hydrothermal method combined with high temperature sintering.The phase structure,morphology,elemental composition,optical absorption and luminescence properties of samples were characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM)-energy spectrometer(EDS),infrared spectrometer(FT-IR)and fluorescence spectrophotometer.The results show that,all the synthesized samples are pure phase of GdPO4 belonging to monoclinic monazite structure,and the Tb3+are uniformly distributed in GdPO4 matrix and cause lattice shrinkage.Under 274 nm photoexcitation,GdPO4∶Tb3+phosphors have the strongest emission peak at 545 nm,which belongs to 5 D4 →7 F5 transition of Tb3+.The fluorescence quenching concentration of Tb3+was determined to be 15％(molar ratio),and this sample(GdPO4∶15％Tb3+)exhibits excellent green light emission and good thermal stability.
gadolinium phosphateTb3+dopinghydrothermal methodhigh temperature sinteringluminescent propertygreen phosphor
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