纳米Y_2O_3:Eu荧光粉的光致发光研究

THE PREPARATION OF NANOCRYSTAL Y2O3∶Eu BY COMBUSTION METHOD AND ITS LUMINESCENT PROPERTIES

报道了用燃烧法制备的系列粒径的纳米Ｙ２Ｏ３∶Ｅｕ材料，对其进行了激发光谱，发射光谱，荧光寿命等测试．结果表明，随着纳米Ｙ２Ｏ３∶Ｅｕ粒径的变化，激发光谱、发射光谱、荧光寿命都发生了明显的变化，猝灭浓度有了明显的提高．通过分析，初步揭示了纳米Ｙ２Ｏ３∶Ｅｕ的光致发光光谱随粒径变化的规律．

anocrystal Y2O3∶Eu with different concentration of Eu and grain size from 5nm to 80nm were prepared by combustion method. Their excitation spectra, emission spectra, the lifetime and integral intensity of different samples were measured and compared. It is found that as the grain size decrease, the absorption of charge transfer states is redshifted from 239 to 250nm, the emission spectra and excitation spectra show a bandlike structure with increasing strength in addition to the peaks as in bulk Y2O3∶Eu material, which is not result from amorphous effect, the life time of 611nm emission decreases in the same magnitude, and the quenching concentration increases. The mechanism of these phenomenon is revealed by crude analysis. 