Author/Authors :
Wang، نويسنده , , Lili and Cao، نويسنده , , Chunyan and Xue، نويسنده , , Xiaojie and Zhao، نويسنده , , Dan and Zhang، نويسنده , , Daisheng and Zheng، نويسنده , , Kezhi and Liu، نويسنده , , Ning-Zhong Shi، نويسنده , , Feng and He، نويسنده , , Chunfeng and Qin، نويسنده , , Weiping، نويسنده ,
Abstract :
A facile hydrothermal method is used for the preparation of Tm3+/Yb3+ codoped fluoride microphosphors. The effect of crystal structure and ions concentration on the spectra and lifetimes of the radiative levels of Tm3+ ions in the different fluoride microcrystals is studied in detail. XRD analysis of Tm3+/Yb3+ codoped LaF3 microcrystals shows that 20% Yb3+ doping is sufficient for hexagonal LaF3 microparticles to crystallize completely in the orthorhombic phase. And lifetime analysis suggests that the average lifetimes of the radiative levels of Tm3+ ions increased when the matrix phase structure changing from orthorhombic phase to hexagonal phase with ytterbium dopant concentration changing.
