Preparation And Properties Of Lutetium Aluminum Garnet(LuAG) Powders

With the development of domestic and international laser industry,global demand for high-quality laser medium is also increasing.Lutetium aluminum garnet(LuAG)is widely used as an excellent laser material matrix.However,the current LuAG powder preparation has the disadvantages of complicated process and expensive equipment.Therefore,it is a new research direction to find economically feasible methods to prepare LuAG nano powders with excellent properties and to use LuAG nano powders with excellent properties to prepare transparent ceramic materials.In this study,high temperature solid phase method and microwave assisted solution combustion method were used to prepare LuAG powder,and microwave assisted combustion method was used to prepare LuAG:Er and LuAG:Cr,Nd phosphor powders.The influence of factors such as doping concentration on the microstructure,morphology and performance of the powder.In this paper,Al2O3 and Lu2O3 are used as raw materials to optimize the high-temperature solid-phase method,and the effects of raw material content,calcination temperature,holding time and flux on the preparation of LuAG powder are studied.The results of the study show that the optimal ratio of Al2O3 is 5wt%based on the theoretical addition.After the formula is kept at 1500? for 3 hours,pure LuAG powder can be obtained,in which the grain size of LuAG is about 500 nm,and the grains are ellipsoidal.The addition of sintering aid has an effect on the synthesis of LuAG powder.Compared with CaF2 and BaF2,the addition of AIF3 has a more positive effect on the synthesis of LuAG powder.The grains of the powder make the particle size distribution of the product more uniform,and the particle size of the product powder is between 200-300nm.When the microwave-assisted solution combustion method is used to prepare the LuAG:Nd sample,the temperature at which the powder begins to crystallize is about 850?.As the calcination temperature increases,the crystallinity of the powder continues to increase.From the perspective of energy saving and powder performance,the calcination temperature is 900?.The substitution of Nd3+ions for Lu3+ions does not significantly change the cubic phase structure of the powder,but only slightly distorts the sample lattice.The higher the Nd3+ ion doping concentration,the greater the lattice distortion.As the doping concentration of Nd3+ continues to increase,the emission peak of the sample shifts to the left,and the emission spectrum of the high doping concentration becomes more asymmetric.In the LuAG:Nd sample prepared by microwave-assisted solution combustion,the quenching concentration of Nd3+ions was 4.0 mol%.In this paper,the microwave-assisted solution combustion method was also used to synthesize LuAG:Er and LuAG:C,Nd phosphors.The strongest emission peak of LuAG:Er phosphors is located at 1532nm.The incorporation of Er3+ ion makes LuAG produce a slight lattice distortion.The optimal doping concentration of LuAG:Er powder prepared by microwave-assisted solution combustion method is 2mol%.In LuAG:Cr,Nd phosphors,the introduction of Cr3+ ions distorts the powder lattice.The strongest emission peak of LuAG:Cr and Nd phosphors is at 1062 nm.When the doping concentration of Cr3+ ions is 4.0mol%,the powder emission peak is strongest.