Monodisperse In₂O₃: Yb³⁺/Er³⁺ upconverting nanoparticles (UCNPs) were firstly synthesized via solvothermal method in three-neck round-bottom flask. Powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier-transform infrared spectroscopy (FTIR) methods are used to characterize the prepared UCNPs. The size of monodisperse spheroid nanoparticles prepared can be controllable in 31 nm. The sample exhibits stronger upconversion luminescence (UCL) than reported In₂O₃: Yb³⁺/Er³⁺ UCNPs with similar size. Furthermore, the obtained In₂O₃ UCNPs, by coating the SiO₂ protecting layer, display fine stability. Simultaneously, the UCL properties and possible energy transfer process of In₂O₃: Yb³⁺/Ho³⁺ and In₂O₃: Yb³⁺/Tm³⁺ NPs have also been investigated by the spectra distribution and power dependence. The results indicate Yb³⁺/Er³⁺, Yb³⁺/Ho³⁺ and Yb³⁺/Tm³⁺ codoped In₂O₃ UCNPs is a probable oxide upconverting material with small size and intense UCL for biological applications.

单分散In ₂ O ₃ : Yb ³⁺ /Er ³⁺上转换纳米粒子(UCNPs)首次在三颈圆底烧瓶中通过溶剂热法合成。粉末 X 射线衍射 (XRD)、透射电子显微镜 (TEM) 和傅里叶变换红外光谱 (FTIR) 方法用于表征制备的 UCNP。制备的单分散球体纳米粒子的尺寸可控制在 31 nm。该样品表现出比具有相似尺寸的In ₂ O ₃ : Yb ³⁺ /Er ³⁺ UCNP更强的上转换发光 (UCL) 。此外，得到的 In ₂ O ₃UCNPs通过涂覆SiO ₂保护层，显示出良好的稳定性。同时，还通过光谱分布和功率依赖性研究了In ₂ O ₃ : Yb ³⁺ /Ho ³⁺和 In ₂ O ₃ : Yb ³⁺ /Tm ³⁺ NPs的 UCL 特性和可能的​​能量转移过程。结果表明Yb ³⁺ /Er ³⁺、Yb ³⁺ /Ho ³⁺和Yb ³⁺ /Tm ³⁺共掺杂In ₂ O ₃ UCNPs 是一种可能的氧化物上转换材料，具有小尺寸和强 UCL，可用于生物应用。