液相合成β-NaLuF4:Yb3+,Er3+胶体颗粒与光学性质研究

Liquid-Phase Synthesis and Optical Properties of β-NaLuF4:Yb3+, Er3+ Colloid Particles

摘要:

在乙醇-水-油酸-油酸钠液相混合体系中，采用水热合成制备了油溶性β-NaLuF4: Yb3+,Er3+胶体粒子。利用X射线粉末衍射技术测定了样品的物相，结果显示样品为纯六方相。通过透射电子显微镜和高分辨透射电子显微镜观察到样品两端为六边形纳米棒状或六棱柱状，平均尺寸为10nm×10nm×40nm。用980nm半导体激光二极管为激发光源，测定了样品的室温上转换发射谱。结果表明样品在543 nm处出现强发射峰，其对应辐射为Er3+离子从激发态4S3/2至基态4I15/2的跃迁，并通过机理分析确定发光跃迁为双光子发射。

Abstract:

Oil-dispersible β-NaLuF4:Yb3+, Er3+ colloid particles were synthesized via a facile hydrothermal method in the liquid-phase system containing ethanol-water-oleic acid-sodium oleic acid. The hexagonal phase structure of the sample was characterized by the X-ray diffraction technique. Transmission electron microscopy and high resolution transmission electron microscopy indicated that the β-NaLuF4:Yb3+, Er3+ colloid particle was crystallized in the hexagonal morphology with the size of 10nm×10nm×40nm. Upon 980 nm near-infrared irradiation, the as-prepared particles showed strong emission peak at 543nm, which corresponded to the 4S3/2-4I15/2 transition of the Er3+ ions. The double-photon emission was assigned to the emitting mechanism.