Optical Properties of CdSe Quantum Dots via Non-TOP based Route

This work reports on the refractive index and permittivity of cadmium selenide quantum dots (CdSe QDs) synthesized without the use of trioctylphosphine (TOP). The transmittance, reflectance, extinction coefficient and permittivity values increase with QDs' size. The refractive index is about 2.64 for CdSe QDs with crystallite sizes between 2.1-4.1 nm. The refractive index and absorbance is dependent on the real and imaginary parts of the dielectric constant respectively. The forbidden direct, allowed indirect and forbidden indirect band gap transitions are not present in the CdSe QDs synthesized via non-TOP based route.