Third-Order Nonlinear Optical Properties of CDTE Quantum Dots

Size-dependent optical properties of semiconductor cadmium tellurite (CdTe) quantum dots (QDs) were examined by UV–Visible absorption, photoluminescence, Transmission electron microscope (TEM) and [Formula: see text]-scan. Red shift in the wavelength was observed in absorption and photoluminescence as the size increased. The size of the CdTe QDs is in the range between 3[Formula: see text]nm and 6[Formula: see text]nm. Two-photon absorption with reverse saturable absorption varied with size in picosecond region due to exciton oscillator. CdTe QDs can be used as optical limiters in the region of visibility.