In this paper, a co-doped cubic phase submicron particles Ba₂LaF₇:Yb³⁺/Ln³⁺ (Ln = Er³⁺,Ho³⁺) up-conversion material were successfully synthesized by hydrothermal method. By adjusting PH, time, temperature, and the amount of sodium citrate during the preparation process, it was possible to analyze and obtain the phase structure, morphology, and up-conversion luminescence characteristics of the particles. Furthermore, the influence of doping concentration on the up-conversion luminescence characteristics was studied using X-ray diffractometer (XRD), scanning electron microscopy (SEM), fluorescence spectroscopy, and other characterization methods. The test results show that, under the conditions of pH = 9 and NaBF₄ as the fluorine source, Ba₂LaF₇:Yb³⁺/Ln³⁺ (Ln = Er³⁺,Ho³⁺) spherical particles have an average size of 240 nm. Under the excitation of a 980 nm laser-diode (LD) laser, it was found that the material spectrum is mainly composed of strong green and weak red light. When Yb³⁺ and Er³⁺ doping concentrations are 18% and 2.5%, Yb³⁺ and Ho³⁺ doping concentrations are 18% and 3.5%, respectively, the up-conversion transmittance is the highest. Finally, the possible causes of the fluorescence decay curve of Ba₂LaF₇:Yb³⁺/Ln³⁺ (Ln = Er³⁺,Ho³⁺) up-conversion materials were investigated.

在本文中，共掺杂立方相亚微米粒子 Ba ₂ LaF ₇ :Yb ³⁺ /Ln ³⁺ (Ln = Er ³⁺ ,Ho ³⁺)通过水热法成功合成了上转换材料。通过在制备过程中调节PH、时间、温度和柠檬酸钠的用量，可以分析得到颗粒的相结构、形貌和上转换发光特性。此外，使用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、荧光光谱和其他表征方法研究了掺杂浓度对上转换发光特性的影响。测试结果表明，在pH=9，NaBF ₄为氟源条件下，Ba ₂ LaF ₇ :Yb ³⁺ /Ln ³⁺ (Ln = Er ³⁺ ,Ho³⁺ ) 球形颗粒的平均尺寸为 240 nm。在 980 nm 激光二极管 (LD) 激光器的激发下，发现材料光谱主要由强绿光和弱红光组成。当Yb ³⁺和Er ³⁺掺杂浓度分别为18%和2.5%，Yb ³⁺和Ho ³⁺掺杂浓度分别为18%和3.5%时，上转换透射率最高。最后，研究了Ba ₂ LaF ₇ :Yb ³⁺ /Ln ³⁺ (Ln = Er ³⁺ ,Ho ³⁺ )上转换材料荧光衰减曲线的可能原因。