Preparation And Characterization Of Eu³⁺ Doped Lu₂SiO₅ Scintillation Ceramic Powders

Scintillation material is a kind of light-emitting material that can absorb rays,high-energy particles and converting them into light emission.It is mainly used in medical imaging,space physics,high-energy physics,industrial testing,geological exploration and other fields.During the exploration of scintillating materials,inorganic scintillating material gradually show its irreplaceable performance advantages,becoming the largest and most widely used scintillator.Lu2SiO5?LSO?is a kind of scintillation material with excellent performance and excellent application prospect.It has the advantages of high density,high effective atomic number,high light output,fast attenuation,strong resistance to radiation damage,and good physical and chemical stability.In this paper,we used direct precipitation method,urea-assisted coprecipitation method and sol-gel method to prepare Eu:Lu₂SiO₅ powders.The structure and luminescence properties of the products were characterized.In the first part of this paper,we failed to prepare high purity Eu:Lu₂SiO₅ powders via direct precipitation method.The product was mainly composed of lutetium sulfite?Lu2Si2O7?,and the content of Lu2SiO5 was less,which was mainly due to the instability of the anion and cation precipitation agent in the precipitation reaction solution system can not be reconciled.In the following part of this paper,Eu:Lu₂SiO₅ powder with high purity was successfully prepared by urea-assisted coprecipitation method and sol-gel method.There is a small amount of impurity phase Lu2O3 in the product prepared by urea-assisted coprecipitation method,while the product prepared by sol-gel method was pure phase.Meanwhile,the the calcination temperature of the powder,the phase transition during calcination,the particle morphology and the effects of Eu3+ addition on the luminescent properties of the Eu:Lu₂SiO₅ powder were also studied.The phase trasition temperature of Lu2SiO5 powder prepared by the two methods is about 1050?.Under the same calcination temperature,the purity of the product prepared by sol-gel method is higher and the crystallization transition is more complete.By urea-assisted coprecipitation method,the particle size of A-Lu2SiO5 phase was 200³00 nm and the particle size of B-Lu2SiO5 was 300⁴00 nm.The particle size of A-Lu2SiO5 and B-Lu2SiO5 prepared by sol-gel method were both 200³00 nm.There were significant differences in the morphology of the products prepared by the two methods.Due to the quenching effect of the concentration,the luminescence intensity of the powder increases and then decreases with the increase of Eu3+ ion doping concentration,the optimum doping concentration is 5 % mol.Under the same conditions,the luminescence intensity of Eu:Lu₂SiO₅ powder prepared by sol-gel method is higher.