烧结温度对Eu3+在羟基磷灰石中发光性能的影响

采用化学沉淀法制备了一系列Eu³⁺掺杂的羟基磷灰石样品,并在不同温度下对样品进行了烧结.使用X射线衍射、红外光谱以及荧光光谱等对样品的结构及发光特性进行了研究.分析表明,烧结对Eu掺杂羟基磷灰石的结构及结晶度产生了影响.在394 nm激发下,样品出现Eu的特征发射,掺杂摩尔分数一定时,随烧结温度增加,样品的荧光发光强度先增大后减小,在500 ℃达到峰值.其荧光寿命随烧结温度的升高而延长.此外,样品中电偶极跃迁与磁偶极跃迁强度之比(I_R:I_O)也随烧结温度的增加先增大后减小.分析表明,烧结温度的改变通过晶体结构对样品的荧光特性以及掺杂取代位置产生了影响.

Effect of Calcination Temperature on The Luminescence Property of Europium (Ⅲ) Ions in Hydroxyapatite Materials

A series of hydroxyapatite (HAP) materials doped with different content of europium (Eu³⁺) were synthesized by one-pot wet-chemical precipitation method. They were calcined under different temperature. The structure, composition and luminescent property were characterized. XRD patterns and IR adsorption peaks showed the characteristic structure and corresponding groups for Eu doped HAP samples. The typical emission peaks attributed to Eu ions were observed in emission spectra of HAP:xEu samples under 394 nm excitation. The luminescent intensity of Eu doped samples was enhanced firstly and then decreased after 500 ℃ calcination. Meanwhile, the fluorescent lifetime of doped samples increases with the temperature. Furthermore, the ratio of intensity between 618 nm and 595 nm corresponding to electric-dipole and magnetic-dipole transition (I_R:I_O) increases firstly and then decreases at 600 ℃, which revealed that the proportion of substitute type and site of Ca ions by Eu ions were helpful to realize the substitute process and functional structure design.