Abstract
Nanocrystal quantum dots (QDs) have great potential for optoelectronic applications such as light emitting diodes and lasers due to their superior optical properties. The core-shell CdSe/CdS QDs can suppress Auger recombination effectively and enhance the emission efficiency. However, it will lead to poor photostability due to the small conduction band offset between CdSe core and CdS shell. For effective electron confinement, a thin shell of wide band gap ZnS semiconductor was grown on the CdSe/CdS core-shell QDs. The influence of ZnS shell has been investigated by comprehensive spectroscopic characterization. It is demonstrated that the CdSe/CdS/ZnS QDs show high photostable and temperature-insensitive emission. Moreover, room temperature lasing based on CdSe/CdS/ZnS QDs coated on a fiber was achieved. The lasing action can maintain under higher temperature up to 312.6 K. The experimental result is important for high performance optoelectronic device application based on colloidal QDs.
Highlights
Optical characteristics of CdSe/CdS/ZnS quantum dots (QDs) were investigated through comprehensive spectroscopic study
Thanks to the improved optical properties of QDs, laser action is successfully obtained based on whispering gallery mode (WGM) at room temperature by coating the QDs on the fiber surface
It is expected that the electronic structure and the corresponding optical property will change with the additional ZnS shell
Summary
Optical characteristics of CdSe/CdS/ZnS QDs were investigated through comprehensive spectroscopic study. Photostable and temperature-insensitive QDs have been obtained by analyzing the influence of ZnS shell on CdSe/CdS QDs. Thanks to the improved optical properties of QDs, laser action is successfully obtained based on whispering gallery mode (WGM) at room temperature by coating the QDs on the fiber surface. Lasing at higher temperatures up to 312.6 K was demonstrated, which indicates the superior photostability of the samples
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