Fabrication and characterization of GaP/polymer nanocomposites for advanced light emissive device structures |
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Authors: | S L Pyshkin J Ballato I Luzinov B Zdyrko |
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Institution: | (1) Institute of Applied Physics, Academy of Sciences, Academy St. 5, 2028 Kishinev, Moldova;(2) Clemson University, Clemson, SC 29631-1555, USA;(3) Center for Optical Materials Science & Engineering Technologies (COMSET), Clemson University, Technology Dr. 91, Anderson, SC 29625, USA;(4) School of Materials Science and Engineering and Center for Optical Materials Science and Engineering Technologies, Clemson University, 161 Sirrine Hall, Clemson, SC 29634, USA |
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Abstract: | GaP nanoparticles have been prepared using white P and a mild aqueous synthesis at decreased temperature followed by ultrasonication
and stored as the suspension in water–ethanol mixture. They were characterized by standard methods of X-ray diffraction, transmission
electron microscopy, Raman light scattering, and photoluminescence. Properties of GaP nanoparticles were compared with industrial
and specially grown perfect GaP single crystals. It was shown that the GaP nanoparticles in suspension are the most suitable
for high quality GaP/polymers nanocomposites because only they are uniform with dimensions of about 10 nm which is optimal
for appearance of the pronounced quantum confinement effect. Polyglycidyl methacrylate (PGMA), polyglycidyl methacrylate-co-polyoligoethyleneglycol methacrylate (PGMA-co-POEGMA), and biphenyl vinyl ether (BPVE) polymers were used to prepare GaP polymer nanocomposites. The thickness of the polymer
nanocomposite film was about 250–300 nm defined from AFM scratch experiment. The resulting nanocomposites yielded a bright
luminescence at room temperature in a broad band with the maximum ranging from 2.5 to 3.2 eV and showed pronounced quantum
confinement effects and other interesting and important for application phenomena leading to dramatic 1 eV expansion of GaP
luminescence to the UV spectral region. |
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