期刊
APPLIED SURFACE SCIENCE
卷 630, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2023.157483
关键词
Indium phosphide; Quantum dots; Nd ions; Blue emissive; Interfacial anchoring
Rare earth metal ion neodymium (Nd3+) is found to act as an interfacial anchoring agent for colloidal indium phosphide (InP) quantum dots, inhibiting their growth during shell growth and allowing for tunability of the emitting wavelength. By optimizing the Nd amounts, InP/ZnS core/shell quantum dots with an emission peak of 470 nm are prepared.
Colloidal indium phosphide (InP) quantum dots (QDs) have attracted worldwide attention due to their intrinsic environmental friendliness and excellent optical properties. The incorporation of metal ions has been a common way to modify the properties of InP QDs and some metal ions have been confirmed to be effective in preparation of blue-emitting InP QDs. Herein, the interfacial anchoring effect of rare earth metal ions neodymium(III) (Nd3+) is unveiled for the first time by analyzing the alteration of spectra, size, and composition of QDs after Nd doping. It is evidenced that Nd substitutes for In of InP during the process of nucleation. More crucially, Nd is anchored at the surface of InP and inhibits their further growth at the high temperature of shelling. This ensures that the size of InP QDs and the absorption peak position are almost maintained during shell growth. It is demonstrated that the emitting wavelength of InP/ZnS core/shell QDs is systematically tunable through varying Nd amounts. Finally, the optimized InP/ZnS QDs exhibiting an emission peak of 470 nm with a photoluminescence quantum yield of 44%, and a full width at half-maximum of 46 nm are prepared.
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