鎘系量子點合成及應用與銦系量子點之合成鑑定

Abstract

We used a single-step synthetic method to synthesize highly luminescent (quantum yield >70%) core/shell quantum dots (QDs) with narrow emission bandwidth. The emission wavelength was finely tuned from violet (440 nm) to red (620 nm) by adjusting the ratio of precursors. The core/shell structure and giant size lead to the stability of QDs by passivating the surface. The giant QDs are obtained by multi-injection of Se-TOP, S-TOP and additional Zn precursors for overcoating thick ZnS shell. As a result, the particle size is increased to 11 nm and 13 nm for blue- and green-emitting, respectively. InP QDs are nontoxic emitters, which are considered an alternative to Cd-based QDs. Using (DEA)3P as phosphorus precursor, which is less expensive and more stable in ambient condition than the (TMS)3P, the obtained QDs exhibit narrow emission width of ~65 nm with tunable emission wavelength from 500 nm to 620 nm. By using the successive injection of VI-group precursor (like Se, S in TOP) and Zn precursor, we synthesized the InP/ZnSeS/ZnS core/multishell QDs exhibiting high QY of 76% and particle size of 6.6 nm.