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Synthesis, Characterization and Sampling of GaP Nanoparticles for Light Emissive Devices

S.L. Pyshkin, J. Ballato, S. Belevschii, E. Rusu, A. Racu, D. Van DerVeer
Academy of Sciences of Moldova, MD

Keywords: GaP nanoparticles, synthesis, characterization


This work reviews our recent efforts to advance quality of GaP nanoparticles in framework of the current US/Italy/France/Romania/Moldova project sponsored by the US Government. These quality GaP nanoparticles were synthesized for application in advanced light emissive composites as well as for comparison of their optical properties with perfect GaP bulk crystals. The nanoparticles have been prepared by mild aqueous or colloidal low temperature methods using ultrasonic and ultracentrifuge treatment to improve quality of nano-suspension and to do sampling on the dimensions. A special reagent (TOPO) has been used for prevention of coagulation and aggregation of nanoparticles. The spectra of photoluminescence and Raman light scattering, X-ray diffraction and high resolution microscopy of the nanoparticles prepared under different conditions have been compared with each other as well as with those from bulk single crystals. We demonstrate that thorough ultrasonic treatment as well as using of an ultracentrifuge give an opportunity to get the pure fraction of nanoparticles of app 10 nm dimensions and with the spectral maximum up to 3.2 eV, as well as non-separated or specially selected on dimensions mixtures of GaP particles exhibit broad band luminescence from UV until yellow-red region with controlled width and position of maximum.
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