State Key Laboratory of Luminescent Materials and Devices, and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, PR China.
Sci Rep. 2013;3:1598. doi: 10.1038/srep01598.
Yttrium fluoride YF3:Er(3+) and yttrium oxyfluoride YOF:Er(3+) submicron-crystals with mid-infrared fluorescent emissions were synthesized for the first time. The rhombohedral phase YOF submicron-crystals were synthesized by the crystalline phase transformation from pure orthorhombic YF3 submicron-crystals, which were prepared by co-precipitation method. The composition and morphology were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM), which showed that submicron-crystals were quasi-spherical with the particle size of ~400 nm. A novel formation mechanism of YOF submicron-crystals was proposed. Photoluminescence (PL) spectra indicated the 2.7 μm emission of Er(3+) has remarkably enhanced with the increase of Er(3+) doping concentration, and a novel dynamic circulatory energy transfer mechanism was proposed. Fourier transform infrared spectra (FTIR) were used to demonstrate the change of hydroxyl content. These oxyfluoride submicron-crystals provide a new material for nano/submicron-crystals-glass composites, and open a brand new field for the realization of mid-infrared micro/nano-lasers.
首次合成了具有中红外荧光发射的氟化钇 YF3:Er(3+)和氧化氟钇 YOF:Er(3+)亚微米晶体。通过从纯正交相 YF3 亚微米晶体的晶相转变，首次合成了具有三方相的 YOF 亚微米晶体，该晶体是通过共沉淀法制备的。通过 X 射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对其组成和形态进行了表征，结果表明亚微米晶体呈准球形，粒径约为 400nm。提出了一种 YOF 亚微米晶体的新形成机制。光致发光（PL）光谱表明，随着 Er(3+)掺杂浓度的增加，Er(3+)的 2.7μm 发射显著增强，并提出了一种新的动态循环能量转移机制。傅里叶变换红外光谱（FTIR）用于证明羟基含量的变化。这些氧氟化物亚微米晶体为纳米/亚微米晶体-玻璃复合材料提供了一种新材料，为实现中红外微/纳激光器开辟了一个全新的领域。
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