Double-Shelled InP/ZnMnS/ZnS Quantum Dots for Light-Emitting Devices.

ABSTRACT: Traditionally, ZnS or ZnSe is chosen as the shell material for InP quantum dots (QDs). However, for green or blue InP QDs, the ZnSe shell will form a type-II structure resulting in a redshift of the emission spectrum. Although the band gap of ZnS is wider, its lattice mismatch with InP is larger (∼7.7%), resulting in more defect states and lowered quantum yield (QY). To overcome the above problems, we introduced the intermediate ZnMnS layer in InP/ZnMnS/ZnS QDs. The wide band gap of the intermediate layer (3.7 eV) can confine the electrons and holes in the core completely, and the formation of the type-II structure is avoided. As a result, green InP-based QDs with QY up to 80% were obtained. By adjusting the halogen ratios of the ZnX₂ precursor, the minimum and maximum emission

SUBMITTER: Zhang W 

PROVIDER: S-EPMC6868586 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature