Abstract
Ordered mesoporous silica nanoparticles (MSNs) were impregnated with different loadings of the luminescent complex tris(dibenzoylmethane) mono(1,10-phenanthroline)europium(III) (Eu(dbm)3phen), with the aim of increasing the luminescence by avoiding concentration quenching and having mainly in mind the application as spectral converter for multi-crystalline silicon solar cells. The morphological, structural and luminescence properties of the impregnated silica nanoparticles were characterized by N2 physisorption, X-ray diffraction, transmission electron microscopy, infrared spectroscopy, UV–visible spectroscopy and photoluminescence excitation and emission measurements. Photostability was tested under 1 sun (1000W/m2) illumination for 24h and the related effects were inspected by UV–visible and photoluminescence spectroscopies. Impregnation of the complex into 50–70nm MSNs with pore size tailored around 2.9nm depressed concentration quenching and allowed the use of complex loadings as high as 23wt%. Sunlight irradiation caused a marked increase in the luminescence intensity.
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