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Latest News from the Inorganic Chemistry

Luminescent Nanoparticles

(Dr. Huayna Terraschke, M.Sc. Aline Varella Rodrigues, M.Sc. Eugenie Geringer)

Nanoparticles (NPs) show special luminescence properties, differently from those of bulk materials. For instance, changing the band gap energy allows the precise variation of the emission and absorption maxima, adapting them for specific applications. In addition, nanoparticles can be applied in several different areas, e.g. in the production of thin films or for the development of novel non-toxic sensors in medicine.
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a) AFM image of Y2O3:Eu3+ NPs and b) their size. c) Suspension of Y2O3:Eu3+ in NaCl aqueous solution and d) green luminescence of Y2O3:Tb3+ 

Luminescent thin films are remarkably important for sensor systems, electronic displays and labeling products. The protection of the NPs offered by embedding them in polymer films result in the increase of the stability and efficiency of the luminescence properties.

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Luminescence of Ce-YAG nanoparticles in thin films.Especially Eu2+ ions are very promising as activators for nanomaterials, because their luminescence properties may be influenced by the particle size. We have been recently successfully producing Eu2 +-doped nanoparticles.

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SrAl2O4:Eu NPs precursor under day (left) and UV light (mixture between Eu3+ and Eu2+, middle). Nanoparticles after annealing, demonstrating the compete reduction to Eu2+ (right).

 
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Latest News from the Inorganic Chemistry