Shell-thickness dependent optical properties of CdSe/CdS core/shell nanocrystals coated with thiol ligands
colloidal semiconductor nanocrystals, thiol ligands, photoluminescence quantum yield, single-dot spectroscopy
Using CdSe/CdS core/shell nanocrystals with 1–10 monolayers of CdS shell as the model system, we studied effects of thiol ligands on optical properties of the nanocrystals. The core/shell nanocrystals with original ligands possessed near unity photoluminescence (PL) quantum yield and single-exponential PL decay dynamics. The effects of thiol ligands on optical properties were found to depend on the shell thickness, environment (with/without oxygen), and excitation power (single- or multi-exciton). Systematic and quantitative results reported in this work should provide necessary information for fundamental understanding and technical applications of quantum dots (QDs) coated with thiol ligands.
Tsinghua University Press
Wanzhen Lin,Yuan Niu,Renyang Meng,Lin Huang,Hujia Cao,Zhenxing Zhang,Haiyan Qin,Xiaogang Peng, Shell-thickness dependent optical properties of CdSe/CdS core/shell nanocrystals coated with thiol ligands. NanoRes.2016, 9(1): 260–271