Hydrothermal synthesis of SrF2：yb^3＋/Er^3＋ micro-/nanocrystals with multiform morphologies and upconversion properties

• Published in: Journal of rare earths Vol. 29; no. 1; pp. 32 - 38
• Main Author: 孙家跃 先建波 张翔燕 杜海燕
• Format: Journal Article
• Language: English
• Published: 2011
• Subjects: 上转换发光; 光学性能; 扫描电子显微镜; 水热法合成; 表面活性剂; 透射电子显微镜
• ISSN: 1002-0721; 2509-4963

Micro- and nanocrystals cubic-phase SrF2：yb^3＋/Er^3＋ upconversion luminescence phosphors were synthesized via a facile hydro- thermal route in the presence of different surfactants. The samples were characterized with X-ray diffraction （XRD）, Fourier transtbrm infra- red spectra （FT-IR）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and upconversion emission spectra. As-prepared products showed a variety of morphologies, such as cubic-shaped microcrystal, hierarchical structure microspheres, spheri- cal-shaped nanocrystals and nanosheets. The intrinsic structural feature of cubic-phase SrF2 and two important external factors, namely, the surfactants in the reaction solution and fluoride sources, were responsible for shape determination of SrF2：yb^3＋/Er^3＋. The possible formation mechanisms for products with various architectures were presented. A systematic study on the photoluminescence of yb^3＋/Er^3＋-doped SrF2 samples with cubic shape, microspheres, spherical and nanosheets shapes showed that the optical properties of these products were strongly dependent on their morphologies and size.