Spectroscopy of Single CdSe Magic-Sized Nanocrystals.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40768161.
- Also identified by DOI 10.1021/acs.nanolett.5c02663.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Magic-sized nanocrystals (MSNCs) are semiconductor crystallites that grow in discrete steps. They lead to samples that potentially contain a single size and shape (i.e., monodisperse). To understand the impact of "magic" sizes on optical performance, we study the emission of individual MSNCs at room temperature. We find that the single-MSNC line width dominates ensemble emission spectra. By examining MSNCs with different sizes and shells, we conclude that the observed single-particle line is consistent with coupling of excitons to acoustic surface phonons. This coupling and any residual size dispersity influence MSNCs more than standard quantum dots, which experience weaker confinement. When CdSe quantum dots with similar confinement are compared with small CdSe MSNCs (<2.7 nm diameter), MSNCs have narrower ensemble spectra. Our MSNCs are bright emitters (40-80% efficient) with strong photon antibunching [<i>g</i><sup>(2)</sup>(0) ∼ 0.05], making them promising candidates for applications in optoelectronics and quantum information, where strong three-dimensional confinement is required.