Effect of shell thickness on the optical properties in CdSe/CdS/Zn 0.5Cd0.5S/ZnS and CdSe/CdS/ZnxCd 1-xS/ZnS core/multishell nanocrystals

Shasha Xu, Huaibin Shen, Changhua Zhou, Hang Yuan, Changsong Liu, Hongzhe Wang, Lan Ma, Lin Song Li

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

The evolution of optical properties of two types of core/multishell nanocrystals (NCs)-type A (CdSe/CdS/Zn0.5Cd0.5S/ZnS) and type B (CdSe/CdS/ZnxCd1-xS/ZnS)-with an increase of shell thickness from 3.5 to 15.5 monolayers (MLs) has been studied. When the shell thickness was 9.5 MLs and more, the stability would be greatly improved and the quantum yields (QYs) almost did not change during the process of purification. Even after phase transfer experiment, the QYs of the water-soluble NCs were still kept 70-99% of their initial level. The as-prepared water-soluble NCs with 9.5 MLs and more also exhibited high stability in varying physiological conditions under PBS buffer and continuous UV radiation. For type B core/multishell NCs, due to a consecutive change of lattice parameters from core to shells, there were almost no defects induced between the CdSe core and ZnS shell. As a result, they had higher QYs and stability than type A core/multishell NCs at the same test condition.

Original languageEnglish (US)
Pages (from-to)20876-20881
Number of pages6
JournalJournal of Physical Chemistry C
Volume115
Issue number43
DOIs
StatePublished - Nov 3 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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