In this article, we report on the preparation of CdSe quantum dots (QDs) by sol-gel
method and their optical properties. The average size of QDs is also estimated by using various
ways, such as the Scherer’s formula, The Effros-Brus-Kayanuma’s theoretical expression, TEM
etc. The TEM images of samples show that the mean sizes of QDs are 4 nm. The mean sizes of
QDs are smaller than that of other methods and arranging from 2 to 3.6 nm.
