Photoluminescence Studies of CdS Nanoparticles - Proceedings of All India Seminar on Biomedical Engineering 2012 (AISOBE-2012) - page 82

Results and Discussions

Figure 1 shows the photoluminescence spectra of nanoparticles of CdS for
different excitation wavelengths of 328 nm and the PL peak is about 410 nm. The
luminescence from the surface states has also been observed. The peak of eigen-
transition is strong and steep; the emission peak of surface states is flat and weak.
The PL full-width half-maximum is only about 30 nm, it reveals the narrow size
distribution of nanoparticles. Photoluminescence analysis in 400-650 nm emission
wavelengths shows the well-known green emission band in CdS nanoparticles.
We have seen that the intensity peaks and its full-width half-maximum
increases with increasing the crystalline size. Our result is similar to the work done
[ 14 ] in 2005 by Prabhu et al. Figure 2 shows the PL spectra of CdS nanocrystal
obtained [ 14 ]. .

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