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

6th International Conference on Optical, Optoelectronic and Photonic Materials and Applications 2014

Watanabe, Taichi^1 ; Yokota, Hiroki^1 ; Nakayama, Masaaki^1 ; Kim, Daegwi^1

Department of Applied Physics, Graduate School of Engineering, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka

558-8585, Japan^1

关键词: Band edge;    Bound exciton;    CdSe quantum dots;    Decay dynamics;    Photoluminescence properties;    PL property;    Self-assemble monolayers;    Temperature dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/619/1/012024/pdf
DOI  :  10.1088/1742-6596/619/1/012024

来源: IOP

【 摘 要 】

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.