Abstract
In this work, we have developed a general, simple and template-free solvothermal strategy to prepare Yb3+ and Er3+ codoped Gd-based coordination polymer (GdCP) hollow spheres with glycylglycine as a ligand. Scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, energy dispersive X-ray spectroscopy, infrared and thermogravimetric analysis were used to characterize the hollow spheres. The GdCP hollow spheres are with a size of about 200 nm and the thickness of the shell was about 30 nm. Upconversion emission with 832 nm being the strongest was realized in the hollow spheres when excited with 980 nm laser. Magnetic measurement reveals that the GdCP hollow sphere is paramagnetic. The relaxation information was measured and the product is subjected to T1 weighted imaging. These prepared GdCP hollow spheres may be applied to multimodal imaging.
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