Cu-Cd-Zn-S/ZnS core/shell quantum dot/polyvinyl alcohol flexible films for white light-emitting diodes.

ABSTRACT: We present a facile route for the synthesis of water-soluble Cu-Cd-Zn-S/ZnS core/shell quantum dots (QDs) by simple pH regulation. The PL spectra of Cu-Cd-Zn-S/ZnS core/shell quantum dots can cover the whole visible light region in the case of only two ratios of Cu/Cd/Zn. The emission wavelength of Cu-Cd-Zn-S/ZnS QDs can be conveniently tuned from 474 to 515 and 548 to 629 nm by adjusting the pH value when the ratios of Cu/Cd/Zn are fixed at 1 : 5 : 80 and 1 : 5 : 10, respectively. It is worth noting that under the condition of a constant Cu/Cd/Zn ratio, the UV-vis absorption spectra do not change with the fluorescence spectra, indicating that the band gap of QDs remains unchanged during the change of pH value. The photoluminescence (PL) quantum yield of the as-prepared QDs with yellow emi

SUBMITTER: Li S 

PROVIDER: S-EPMC9055132 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature