We present experimental results on copolymer-based nanocomposite made of styrene with butyl methacrylate (SBMA) (1:1) and inorganic semiconductor <i>CdS</i>. Thin film composite samples have been characterized by UV-Vis absorption and photoluminescent spectroscopy, as well as by transmission electron microscopy. Transmission electron microscope (TEM) examination confirms a relatively narrow distribution of <i>CdS</i> nanoclusters in the SBMA matrix, which covers the range 2-10 nm. On the other side, the average <i>CdS</i> particles size estimated from the position of first excitonic peak in the UV-Vis absorption spectrum was found to be 2.8 nm and 4.4 nm for two samples with different duration of thermal treatment, which is in good agreement with photoluminescence (PL) experimental data. The PL spectrum for <i>CdS</i> nanocrystals is dominated by near-band-edge emission. The relatively narrow line width (40-45 nm) of the main PL band suggests the nanoparticles having narrow size distribution. On the other side, relatively low PL emission from surface trap states at longer wavelengths were observed in the region 500-750 nm indicating on recombination on defects. Key words: nanocomposite, polymer matrix, photoluminescence,
New light-emitting layers of nanocomposites on polymer base have been obtained. As polymeric matrices the
copolymers of styrene and butilmetacrylate in the ratio (1:1) have been used. As organic luminophore compounds from
izotiocianatopropenone and propenone classes were utilized. Transparent composite layers were deposited by spin-coating
method on glass and quartz substrates. The morphological and optical properties of the obtained nanocomposites
have been investigated. An intensive photoluminescence signal has been identified in green area of the spectrum.
Nanocomposites are proposed for various practical applications.
CdS- Poly Vinyl Alcohol (PVA) thin films 2.5-10 µm thick, were obtained by chemical synthesis at 100ºC in 1-60 min from appropriate chemical solutions. The photoluminescence spectra were analyzed for temperatures between 78 and 293 K. The spectra were interpreted using luminescence center model. The luminescence centers number and concentration depends on reaction duration.