Eu在羟基磷灰石中的掺杂及其发光性能研究

摘要

A series of hydroxyapatite (HAP)particles doped with different content of europium (Eu3+)were de-signed and synthesized by a “one-pot”wet-chemical precipitation method and their structure,composition and luminescent property were characterized.XRD patterns and IR adsorption peaks showed the characteristic struc-ture 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 excitation.The luminescent intensity of Eu doped samples enhanced with the rising Eu ions content.Meanwhile,the fluorescent lifetime of doped samples de-creased with the rising doped concentrations.Furthermore,the ratio of intensity between 617 and 595 nm corre-sponding to electric-dipole and magnetic-dipole (I R/I O )was also observed to increase with Eu ions content, which revealed the proportion of substitute type and site of Ca ions by Eu ions and was helpful to realize the substitute process and functional structure design.%本文采用化学沉淀法制备了 Eu3＋掺杂的羟基磷灰石材料(HAP∶xEu)，使用 X 射线衍射、红外光谱以及荧光光谱等对其结构及发光特性进行了研究。分析表明，制备得到的掺杂羟基磷灰石具有晶态结构，其红外谱中出现隶属于 OH－、PO3－4的特征振动峰。光谱分析结果表明，在394 nm 波长激发下，掺杂Eu的羟基磷灰石样品的荧光发光强度和荧光寿命呈现随掺杂浓度的增加相反的变化趋势：发光强度增加6倍同时其荧光寿命却下降了约30％。此外，样品中电偶极跃迁与磁偶极跃迁强度之比(I R/I O )随 Eu3＋掺杂浓度增加表明Eu占据羟基磷灰石晶格中的Ca Ⅱ不对称位点的比例大于占据Ca Ⅰ对称位点的比例，并可受到掺杂量的影响。