Author/Authors :
Hongyan Wang، نويسنده , , Jianfu Li، نويسنده , , Guohua Jia، نويسنده , , Zhenyu You، نويسنده , , Fugui Yang، نويسنده , , Yanping Wei، نويسنده , , Yan Wang، نويسنده , , Zhaojie Zhu، نويسنده , , Xiuai Lu، نويسنده , , Chaoyang Tu، نويسنده ,
Abstract :
Dy3+-doped NaGd(WO4)2 crystal with sizes of about Φ20×40 mm2 was grown by the Czochralski technique along the (0 0 1) orientation. Polarized absorption spectra, fluorescence spectra, and fluorescence decay curve of Dy3+-doped NaGd(WO4)2 have been recorded at room temperature. Based on the Judd–Ofelt (J–O) theory, the intensity parameters from the measured line strengths were evaluated. The J–O parameters were used to predict radiative transition probabilities, radiative lifetimes and branching ratios for various excited levels of Dy3+-doped NaGd(WO4)2 crystal. The luminescent quantum efficiency of the 4F9/2 level was determined to be approximately 63% for this material. The emission cross-section of the 4F9/2→6H13/2 transition was estimated by using the Füchtbauer–Ladengurg method.
