Abstract
An unsophisticated preparation of silica@Eu spheres has been investigated. Many experimental tests, such as transmission electron microscopy and energy dispersive spectrometer mapping, were carried out to confirm that the rare earth complex coats the surface of silica spheres and also confirming the formation of silica@Eu. The combination of silica and a rare earth complex is realized by a simple binding force of nitrogen and fluorine in the ligand and the hydrogen bond on the surface of silica from an x-ray photoelectron spectroscopy test. The synthetic composite fluorescent microsphere greatly improves the thermal stability, as compared with a pure complex. The relationship between emission intensity and diameters of silica is also investigated. The results of the study found that as the size of silica increases, the fluorescence intensity enhances. Furthermore, the increase in size also extends the fluorescence lifetime to some extent. With the embedded structure, the europium complex has better dispersion and other properties, which means that it has broader application prospects, such as bioimaging, fluorescent markers, and optoelectronic devices.
Highlights
Trivalent europium complex is a good red-emitting activator.1 The f–f transition of central europium ions is the source of red emission
Based on the Stöber method and some previous paper, silica spheres with homogeneous size are prepared with the different amounts of ammonia
As it can be seen from the transmission electron microscopy (TEM) images, silica spheres with increasing size are synthesized with more ammonia
Summary
Trivalent europium complex is a good red-emitting activator. The f–f transition of central europium ions is the source of red emission. Trivalent europium complex is a good red-emitting activator.. The f–f transition of central europium ions is the source of red emission. Enhanced light harvesting and protection of the ligands improve the emission of the europium ions.. As a good red-emission phosphor with large Stokes shift, and narrow emission, it has been used as probes, detectors, light-responsive therapeutic agents, and so on. The wide range of applications is limited by technical issues. The introduction of antenna ligands is one of the solutions to increase molar absorptivity and stability.. The suitable matrix material is a good solution, and there have been many successes, such as water soluble, magnetic, and film coating luminescent complexes.. A suitable matrix can give a luminescent complex organic and inorganic properties to be used in a wider range of fields. The suitable matrix material is a good solution, and there have been many successes, such as water soluble, magnetic, and film coating luminescent complexes. A suitable matrix can give a luminescent complex organic and inorganic properties to be used in a wider range of fields.
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