Correlation between surface state and band edge emission of white light ZnxCd1-xS nanocrystals

Hong Shuo Chen, Shu Ru Chung, Tsan Yao Chen, Kuan Wen Wang

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

In this study, we have demonstrated a facile thermal pyrolyzed route to prepare ternary ZnxCd1-xS nanocrystals (NCs) with high quantum yield (QY) and white light emission. The detailed surface and structural characterizations based on the X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS) measurements have illustrated that by controlling the Zn content, the surface chemical states as well as the surface state emission of NCs can be manipulated, and their optical properties can be tuned accordingly The Zn shell of NCs may enhance the surface state emission, especially for Zn0.8Cd0.2S, thereby promoting the white light emission and increasing the QY to 56%. Moreover, the QY of Zn 0.8Cd0.2S decreases from 56 to 49% after aging in hexane for 2 months, implying that the stability of NCs is excellent. The surface oxide-rich structure could be the reason that influences the surface state emission and stability of the ZnxCd1-xS NCs. This journal is

Original languageEnglish
Pages (from-to)2664-2667
Number of pages4
JournalJournal of Materials Chemistry C
Volume2
Issue number15
DOIs
StatePublished - 21 Apr 2014

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