【摘要】 利用共沉淀法制备了纳米晶Gd2O3∶Eu3+发光粉体。在不同掺杂浓度、不同煅烧温度的系列样品中,均观测到Eu3+离子的特征发射。样品的晶相与发射性质的研究表明:所制备的样品经800～1 300℃热处理后,晶相为立方相,1 400℃时开始向单斜相转变。荧光强度与Eu3+离子掺杂浓度关系研究表明:在不同掺杂浓度中,Eu3+离子浓度为4%时其相对发射强度最强。在三个不同的煅烧温度中,经800℃煅烧的样品其发光效果最好。此外还观察到电荷转移激发态以及基质、Gd3+与Eu3+之间的能量传递。激发谱包含三部分,即电荷转移带、Eu3+的4f内壳层电子跃迁和Gd3+的激发谱。更多还原

【Abstract】 The phosphorous powders of nanocrystalline Gd2O3∶Eu³⁺ were prepared by co-precipitation method.The room temperature sharp characteristic emissions of Eu³⁺ ions were observed for the samples sintered under different temperatures and doped concentrations.The crystalline phases and luminescent properties of the samples were studied.The results showed that there exist different crystalline phases in the samples which were sintered at different temperature region from 800 ℃ to 1 300 ℃.The cubic phase was observed when the samples were sintered in the temperature region 800¹ 300 ℃,and the cubic-monoclinic mixture phases were observed when the sintering temperature was 1 400 ℃.The effect of the Eu³⁺ doping concentration on the fluorescence emission intensity was discussed.The optimum doped concentration for the luminescence intensity of Eu³⁺ is determined to be 4% for the cubic structure samples.The optimum post-treatment temperature for obtaining the most intense emission is determined to be 800 ℃ for the cubic structure.Effective charge-transfer excitation and the energy transfer from the host and Gd³⁺ to Eu³⁺ were observed.The excitation spectrum is composed of three components,namely,the charge transfer band,intra 4f-configuration transitions of Eu³⁺,and the excitation spectrum of Gd³⁺.更多还原