Effects of surface modification on photoluminescence properties of self-assembled monolayer of CdSe quantum dots

Abstract

We have investigated surface-modification effects on photoluminescence (PL) properties of the self-assemble monolayer of CdSe quantum dots from the viewpoint of the temperature dependence of PL properties. The band-edge PL band is strongly activated by the surface modification and is observed as the main PL band, contrary to the fact that the defect-related PL band is dominant in the as-grown sample. From the analysis of PL decay dynamics, it is demonstrated that the contribution of a bound exciton state to PL processes would suppress a trapping process to defects.