Abstract
In this study, Eu-coated SiO2 nanoparticles have been prepared, consisting of an interfacial complex of Eu and 1,10-phenanthroline (phen) at the solid surfaces of the SiO2/Eu nanostructures. The as-prepared SiO2/Eu/phen nanoparticles exhibits sharp red emission via energy transfer from the phen to the EuIII. After sintering at 200 °C in air, the emission is tuned from red to blue. The blue emission is originated from EuII. This reduction-induced emissive phenomenon resulted from the electron-donating environment created by the surrounding phen and SiO2, which is the first reported fabrication of a stable EuII-based emissive material using mild conditions (reaction in air and at low temperature) and an organic-inorganic hybrid nanostructure. The existence of two different stable oxidation states with characteristic emissions, blue emissive EuII and red emissive EuIII, suggests significant potential applications as novel luminescent materials with inorganic-organic hybrid structures.
Highlights
In this study, Eu-coated SiO2 nanoparticles have been prepared, consisting of an interfacial complex of Eu and 1,10-phenanthroline at the solid surfaces of the SiO2/Eu nanostructures
To coat the SiO2 surfaces with Eu ions, SiO2 nanoparticles (20 ~ 50 nm) were immersed in a 50 mM ethanol solution of EuCl3 at 70 °C for 30 min, resulting in coating of Eu ions on the SiO2 surfaces. This colloidal suspension containing the SiO2 and Eu ion was subsequently dropped onto a quartz substrate that was dried at 110 °C for 15 min
Interfacial complexation with anthraquinone or cyclopentadiene has been demonstrated at the solid surface of TiO2, and has been shown to function as an excellent visible light absorber for photoelectric conversion[22,23]
Summary
Eu-coated SiO2 nanoparticles have been prepared, consisting of an interfacial complex of Eu and 1,10-phenanthroline (phen) at the solid surfaces of the SiO2/Eu nanostructures. The blue emission is originated from EuII This reduction-induced emissive phenomenon resulted from the electron-donating environment created by the surrounding phen and SiO2, which is the first reported fabrication of a stable EuII-based emissive material using mild conditions (reaction in air and at low temperature) and an organic-inorganic hybrid nanostructure. The existence of two different stable oxidation states with characteristic emissions, blue emissive EuII and red emissive EuIII, suggests significant potential applications as novel luminescent materials with inorganic-organic hybrid structures. The existence of two different oxidation states with characteristic emissions as well as the high emission efficiency of EuII and the high colour purity of EuIII is predicted to allow the fabrication of novel luminescent materials for a wide range of applications, in the event that a process is found that allows the desired species to be readily selected. It is expected that a combination of an inorganic matrix with organic compounds will produce novel luminescent materials in which the performance of the Eu ion is enhanced
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