Tìm kiếm theo cụm từ
Chi tiết
Tên Optical properties of CdS and CdS/ZnS quantum dots synthesized by reverse micelle method.
Lĩnh vực Vật Lý
Tác giả Vu Thi Kim Lien, Chu Viet Ha, Le Tien Ha and Nguyen Nhu Dat
Nhà xuất bản / Tạp chí IOPElectronic Journal, Journal of Physics: Conference Series AMSN08 - UK (Anh) Tập 187 Năm 2009
Tóm tắt nội dung

In this work, we report on the colloidal preparation (here reverse micelle method) and optical properties of CdS and CdS passivated by ZnS shell (CdS/ZnS) semiconductor nanocrystals quantum dots. The CdS quantum dots were produced ranging from about 2.5 to 3.6 nm in diameter depending on the concentration of surfactant agent. The absorption spectra of CdS QDs show the narrow size distribution. The photoluminescence spectra include two bands, the intrinsic emission of CdS nanocrystals and the emission of surface states. There is noticeable increase of the photoluminescence emission intensity and subsequent photostability in CdS/ZnS quantum dots samples compared with CdS quantum dots samples without the ZnS shell.