Preparation And Spectral Properties Of Er,Yb:?LaLu?₂O₃ Nano-powders And Transparent Ceramics

In recent years,rare earth doped namometer luminescent materials have been used in solid lasers,transparent ceramics,and temperature sensors.Lu₂O₃ is an excellent host matrix due to its stable physical and chemical properties,lower phonon energy,facilitating the substitution of rare earth.So it can be used as a matrix material in transparent ceramic preparation processes.In this study,Er,Yb:?LaLu?₂O₃nanopowders were prepared bycitric acid combustion method.The preparation conditions of powders were determined by XRD and SEM.Er,Yb:?LaLu?₂O₃transparent ceramics were prepared by cold isostatic-vacuum sintering method,according to the SEM image and the ceramic sample's transmittance curve to obtain the preparation process conditions of the ceramic.The major research contents and its results are listed below:1.The Er,Yb:?LaLu?₂O₃ ceramic powders were synthesized by citric acid-gel combustion method.The structure and morphology of the nanopowders were tested.The precursors were calcined at 1000?for 2h in order to convert the precursors into Er,Yb:?LaLu?₂O₃ nanoparticles with an average particle size of 50nm.2.Preparation of Er,Yb:?LaLu?₂O₃ transparent ceramics by cold isostatic-vacuum sintering method.According to the SEM images and transmittance curves of the samples,the preparation conditions of Er,Yb:?LaLu?₂O₃ ceramics were obtained:Ethyl orthosilicate was added as a sintering aid,the sintering temperature was 1800°C,the sintering constant time was 20h,and the annealing heat treatment was performed at 1400°C for 20h.3.The effects of La³⁺,Er³⁺andYb³⁺doping amounts on the luminescence intensity of the ceramics were investigated.The results show that the La³⁺,Er³⁺,and Yb³⁺doping molar fractions are 10%,7%,and 5%,respectively,and the upconversion luminescence intensity is the highest,and the up-conversion mechanism is analyzed.4.Through the transmittance and absorption spectrum tests of Er,Yb:?LaLu?₂O₃ceramics,the average transmittance of Er,Yb:?LaLu?₂O₃ ceramics in the visible light band is 72.5%,among them,the highest transmittance rate reached 79%,and the average transmission rate in the near-infrared band was 76.4%,of which the highest transmission rate reached 85.3%.