SIZE EFFECT IN STEADY-STATE AND TIME-RESOLVED LUMINESCENCE OF QUANTIZED MOS2 PARTICLE COLLOIDAL SOLUTIONS

Light absorption as well as steady-state and time-resolved recombined luminescence properties of quantized MoS2 particle colloidal solutions in acetonitrile and ethanol were studied. This particular system has revealed the existence of size effect. Emission spectra of colloids at different wavelengths of excitation show similar shapes but are shift ed in energy. Luminescence of MoS2 particles is attributed to radiativ e electron tunnelling from deep electron traps to shallowly trapped ho les. Additives such as methylviologen, oxygen and nitrobenzene quench the emission of quantized particles. The quenching is associated with electron transfer from electron traps to quencher and its efficiency d epends strongly on the size of MoS2 particles, which were estimated to range in diameter (2R(p)) from 2 to 3.4 nm.