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采用水热法制备了高纯度六角相NaGdF4纳米颗粒,对样品的结构与形貌进行了表征。在980 nm激光激发下,研究了Yb3+/Tm3+共掺杂NaGdF4纳米颗粒的近红外上转换发光特性;分析了Yb3+/Tm3+共掺杂NaGdF4的能量传递机理,研究了泵浦功率与发光强度的关系。结果表明:共掺杂NaGdF4纳米颗粒在980 nm下可发射出800 nm的强近红外光,其与475 nm蓝光发射的强度比为42。样品中800 nm发射对应两光子过程,475 nm发射对应三光子过程。
High-purity hexagonal NaGdF4 nanoparticles were prepared by hydrothermal method. The structure and morphology of the samples were characterized. Under 980 nm laser excitation, the up-conversion of Yb3 + / Tm3 + co-doped NaGdF4 nanoparticles was investigated. The energy transfer mechanism of Yb3 + / Tm3 + co-doped NaGdF4 was analyzed. The relationship between pump power and luminescence intensity . The results show that the co-doped NaGdF4 nanoparticles can emit strong near-infrared light at 980 nm at a wavelength of 800 nm, which is 42% of that at 475 nm. The 800 nm emission corresponds to the two-photon process in the sample, and the 475 nm emission corresponds to the three-photon process.