Photoluminescence Studies of CdS Nanoparticles - Proceedings of All India Seminar on Biomedical Engineering 2012 (AISOBE-2012) - page 79

Photoluminescence Studies of CdS
Nanoparticles

Kirti Vishwakarma, O. P. Vishwakarma and S. K. Pandey

Abstract II-VI semiconductor nanoparticles are presently of great interest for
their practical applications such as zero-dimensional quantum confined materials
and for their applications in optoelectronics and photonics. The optical properties
get modified dramatically due to the confinement of charge carriers within the
nanoparticles. Similar to the effects of charge carriers on optical properties,
confinement of optical and acoustic phonon leads to interesting changes in the
phonon spectra. In the present work, we have synthesized nanoparticles of cad-
mium sulfide (CdS) using chemical precipitation technique. A detailed study on
CdS sample is done by characterizing photoluminescence (PL) spectra. Photolu-
minescence studies of CdS nanoparticle samples show a red shift. The intensity of
red luminescence decreases and its peak position shifts to the lower energy with
increasing size of the particles.

Keywords Cadmium sulfide Nanoparticles Photoluminescence spectra

Optical properties

Introduction

There is presently widespread interest in the physical and optical properties of
nanometer-sized semiconductor particles, the so-called nanoparticles or quantum
dots. It is known that the optical properties of such particles depend on their size

K. Vishwakarma ( & ) O. P. Vishwakarma
Department of Engineering Physics, Gyan Ganga College of Technology, Jabalpur, India
e-mail: [e-mail]
S. K. Pandey
Rani Durgawati Vishwavidalaya, Jabalpur, India