Study On Preparation And Properties Of Cr³⁺,Yb³⁺,Ho³⁺:Yagg Crystal Raw Materials

In this thesis,Cr3+,Yb3+,Ho³+:YAGG ceramic materials were prepared by Citric acid sol-gel combustion method, Ammonia co-precipitation method and Solid-phase method.The phase change process,composition, morphologies and fluorescence properties of the samples were characterized by XRD,IR, SEM,TG-DTA and fluorescence spectra.The results of XRD,IR and TG-DTA indicated that the pure YAGG powders were obtained when the samples were calcined at800℃for4h. SEM images reveal that the different burners had different effects on the morphology and particle size of the samples,the Cr³+,Yb³+,Ho³+:YAGG samples which were prepared by Ammonia co-precipitation method had the best dispersity and the diameter was50nm. Meanwhile,The fluorescence spectrum showed that the strongest emission peaks of the samples was1210nm,corresponding to5^l₆-5^l₈transition of Ho3+.A weaker emission peak appeared at1050nm because of2^F_5/2-2^F_7/2 transition of Yb³+.and the energy transfer from Cr³+to Yb³+and Yb³+to Ho³+was observed.