2.0-μm emission and energy transfer of Ho~(3+)/Yb~(3+) co-doped LiYF_4 single crystal excited by 980

• 作 者: 杨硕 夏海平 姜永章 张加忠 江东升 王成 冯治刚 张健 谷雪梅 章践立 江浩川 陈宝玖
• 机 构: Key Laboratory of Photoelectronic Materials,Ningbo University,Ningbo Institute of Materials Technolo
• 出 处: Chinese Physics B
• 发表日期: 2015年06期
• 关键词: excited Bridgman transmittance luminescent decay excitation crystalline doping l

Ho3+/Yb3+co-doped Li YF4 single crystals with various Yb3+concentrations and ～ 0.98 mol% Ho3+concentration are grown by the Bridgman method under the conditions of taking Li F and YF3 as raw materials and a temperature gradient(40°C/cm–50°C/cm) for the solid–liquid interface.The luminescent performances of the crystals are investigated through emission spectra,infrared transmittance spectrum,emission cross section,and decay curves under excitation by 980 nm.Compared with the Ho3+single-doped Li YF4 crystal,the Ho3+/Yb3+co-doped Li YF4 single crystal has an obviously enhanced emission band from 1850 nm to 2150 nm observed when excited by a 980-nm diode laser.The energy transfer from Yb3+to Ho3+and the optimum fluorescence emission around 2.0 μm of Ho3+ions are investigated.The maximum emission cross section of the above sample at 2.0 μm is calculated to be 1.08×10-20cm2 for the Li YF4 single crystal of1-mol% Ho3+and 6-mol% Yb3+according to the measured absorption spectrum.The high energy transfer efficiency of88.9% from Yb3+to Ho3+ion in the sample co-doped by Ho3+(1 mol%) and Yb3+(8 mol%) demonstrates that the Yb3+ions can efficiently sensitize the Ho3+ions.

Ho3 + / Yb3 + co-doped Li YF4 single crystals with various Yb3 + concentrations and ~ 0.98 mol% Ho3 + concentrations were grown by the Bridgman method under the conditions of LiF and YF3 as raw materials and a temperature gradient (40 ° C / cm-50 ° C / cm) for the solid-liquid interface. The luminescent performances of the crystals are investigated by emission spectra, infrared transmittance spectrum, emission cross section, and decay curves under excitation by 980 nm. Compared with the Ho3 + single-doped Li YF4 crystal, the Ho3 + / Yb3 + co-doped Li YF4 single crystal has an obviously enhanced emission band from 1850 nm to 2150 nm observed when excited by a 980-nm diode laser. energy transfer from Yb3 + to Ho3 + and the optimum fluorescence emission around 2.0 μm of Ho 3 + ions are investigated. The maximum emission cross section of the above sample at 2.0 μm is calculated to be 1.08 × 10-20 cm 2 for the Li YF 4 single crystal of 1-mol% Ho 3 + and 6-mol% Yb3 + according to the measured absorption spectrum high energy transfer efficiency of 88.9% from Yb3 + to Ho3 + ion in the sample co-doped by Ho3 + (1 mol%) and Yb3 + (8 mol%) demonstrates that the Yb3 + ions can efficiently sensitize the Ho3 + ions.