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采用甘氨酸-硝酸盐燃烧法制备了Sr2CeO4和Sr2CeO4:Nd3+发光纳米粒子。样品的结构及性质采用XRD,TEM,荧光光谱及荧光衰减曲线等进行表征。在1200℃煅烧1h能够得到均匀的类球形Sr2CeO4:Nd3+纳米粒子,其粒径大小为20~40nm,并具有良好的分散性和高效的近红外发光特性。Nd3+合适掺杂浓度为0.15%(摩尔分数)。对Sr2CeO4:Nd3+近红外发光的机制分析表明:通过基质Sr2CeO4吸收紫外光,基团CeO4发生了电荷转移达到激发态,并将激发态能量传递给了Nd3+,从而使Sr2CeO4:Nd3+产生了特征的近红外发射。
The Sr2CeO4 and Sr2CeO4: Nd3 + luminescent nanoparticles were prepared by the glycine-nitrate combustion method. The structure and properties of the samples were characterized by XRD, TEM, fluorescence spectroscopy and fluorescence decay curve. When calcined at 1200 ℃ for 1h, the uniform spherical spheroidal Sr2CeO4: Nd3 + nanoparticles with the size of 20 ~ 40nm can be obtained with good dispersibility and high NIR emission. The proper doping concentration of Nd3 + is 0.15% (mole fraction). The mechanism of Sr2CeO4: Nd3 + near-infrared light emission shows that the charge of CeO4 reaches the excited state and the excited state energy is transferred to Nd3 + by the absorption of UV light through Sr2CeO4, which makes Sr2CeO4: Nd3 + Infrared emission.