La_(2.4)Mo_(1.6)O_8∶Yb~(3+),Er~(3+)材料的制备及其上转换发光性质

采用高温固相法制备了La_(2.4)Mo_(1.6)O_8∶Yb~(3+),Er~(3+)荧光粉。通过X射线衍射(XRD)和上转换发射光谱对样品进行了相结构和发光性质表征。XRD实验结果表明:合成的样品为面心立方萤石结构(Fm-3m)的La_(2.4)Mo_(1.6)O_8相。在980 nm红外光激发下,La_(2.4)Mo_(1.6)O_8∶Yb~(3+),Er~(3+)荧光粉发出分别来自Er~(3+)离子的~2H1_(1/2)→~4I_(15/2)、~4S_(3/2)→~4I_(15/2)跃迁的绿光(主峰为548和529 nm)和~4F_(9/2)→~4I_(15/2)跃迁的红光(主峰为670 nm)。进一步地,对样品中可能的上转换发光机制进行了讨论。

Preparation and Upconversion Luminescence Properties of La2.4Mo1.6O8:Yb3+,Er3+

La_2.4Mo_1.6O₈:Yb³⁺,Er³⁺ phosphor was prepared by the hightemperature solid state reaction. The phase structures and luminescence properties of La_2.4Mo_1.6O₈:Yb³⁺,Er³⁺ phosphors were examined by X-ray diffraction(XRD) and upconversion emission spectra, respectively. The XRD results show that the final sample is La_2.4Mo_1.6O₈ phase with a face centered cubic CaF₂ structure. Upon excitation of 980 nm pulsed laser, La_2.4Mo_1.6O₈:Yb³⁺,Er³⁺ phosphor emitted the green emission lines and the red emission lines, which are originated from the ²H_11/2→⁴I_15/2, ⁴S_3/2→⁴I_15/2 and ⁴F_9/2→⁴I_15/2 transitions of Er³⁺, respectively. The possible upconversion luminescence mechanism in the sample is further discussed.