用湿化学共沉淀法制备了(Y, Gd)2O3:Eu3+纳米粒子. 用XRD, TEM, SEM及差示/热重分析 (DSC/TG)手段对粉体进行了表征. 用荧光光度计分析了样品的激发光谱和发射光谱. 结果表明： 在煅烧温度为800 ℃保温2 h时, 合成出近似球形、粒径均匀且分散性好的(Y, Gd)2O3:Eu3+纳米粒 子, 一次颗粒尺寸约为20 nm. 样品在波长为612.0 nm监控光下激发, 出现235和250 nm两个激发 峰, 分别为(Y, Gd)2O3基质吸收和Eu3+迁移态(CTS)吸收造成的. 两个波长激发下的发射光谱峰强 度前者高于后者. 当掺杂Eu3的摩尔浓度为3%时, 发射光谱对应5D07F2 能级跃迁的相对峰强度 最大, 当Eu3+掺杂的摩尔浓度为7%时, 相对峰强度反而降低, 这是由于Eu3+的浓度猝灭造成的.
In this paper, the (Y,Gd)2O3:Eu3+ superfine powders were prepared by co-precipitation method and ammonia was employed as precipitating agent. The means of XRD 、TEM、 SEM and DSC/TG were used to analyze the morphology and characteristics of the powders. The excitation spectrum and emission spectrum of the samples were analysed by the fluorophotometer. The results show that the powders are spherical particles with uniform size distribution of 20nm in the case of the powders were calcined at 800℃ for 2h. The sample has two excitation peaks at 235nm and 250nm when the monitoring wavelength is 612nm. The two peaks are caused by the Gd2O3 medium absorption and the CTS absorption of Eu3+ respectively. The intensity of the emission spectrum with the exciting at 235nm is higher than excited at 250nm. When the molar concentration of corporation Eu3+ is 3%, the emission peak of 5D0→7F2 transition states of the emission spectrum is the strongest, and when the corporation Eu3+ is 7%, intensity of the emission peak decreased, which is due to the concentration quenching.
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