Synthesis and characterization of highly luminescent CdSe-core CdS/Zn0.5Cd0.5S/ZnS multishell nanocrystals.

By Renguo Xie, U. Kolb, Jixue Li, T. Basché, A. Mews. Journal of the American Chemical Society, 2005

816 citations recorded by the source corpus.

We report on the preparation and structural characterization of CdSe nanocrystals, which are covered by a multishell structure from CdS and ZnS. By using the newly developed successive ion layer adhesion and reaction (SILAR) technique, we could gradually change the shell composition from CdS to ZnS in the radial direction. Because of the stepwise adjustment of the lattice parameters in the radial direction, the resulting nanocrystals show a high crystallinity and are almost perfectly spherical, as was investigated by X-ray diffraction and electron microscopy. Also, due to the radial increase of the respective valence- and conduction-band offsets, the nanocrystals are well electronically passivated. This leads to a high fluorescence quantum yield of 70-85% for the amine terminated multishell particles in organic solvents and a quantum yield of up to 50% for mercapto propionic acid-covered particles in water. Finally, we present experimental results that substantiate the superior photochemical and colloidal stability of the multishell particles.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/460342cd2f3bcb8e653e6925321c5a157333eebf

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

1. Teng Zhai
2. Xiaosheng Fang
3. Dmitri Golberg
4. U. Gautam
5. Liang Li
6. Yoshio Bando
7. Limin Wu
8. T. Tseng

In Materials Chemistry

1. Teng Zhai
2. Xiaosheng Fang
3. Dmitri Golberg
4. Yoshio Bando
5. Liang Li
6. U. Gautam
7. Limin Wu
8. T. Tseng

Citations in the corpus

• Quantum Dots and Their Multimodal Applications: A Review (2010, background): “The advantages of both shell materials are combined in core/shell/shell CdSe/CdS/ZnS Qdots [88,89].”
• Quantum Dots-Converted Light-Emitting Diodes Packaging for Lighting and Display: Status and Perspectives (2016, background): “The elements in QDs are usually in group II–VI, such as CdSe [4]; group III–”
• Advanced Material Concepts for Luminescent Solar Concentrators (2008, neutral): “This increases FQY and has been found to improve stability [60].”
• ZnS nanostructures: From synthesis to applications (2011, background): “5S/ZnS multishell nanocrystals with high QE of 70–85% [35].”