Facile synthesis and observation of discontinuous red-shift photoluminescence of CdTe/CdS core/shell nanocrystals

Weiwei Xu, Huaibin Shen, Jin Zhong Niu, Changhua Zhou, Cailan Yu, Xiaomin Li, Yuan Hang, Hongzhe Wang, Lan Ma, Lin Song Li

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

A simple method was introduced to synthesize CdTe/CdS core/shell nanocrystals (NCs) by using a new kind of "green" tellurium precursor. Both absorption and photoluminescence (PL) spectra of CdTe/CdS NCs exhibited a discontinuous shift as follows: slight (<10 nm), large (∼30 nm), and slight (<10 nm) red-shift during the growth of CdS shell. Different sized CdTe cores were introduced to synthesize CdTe/CdS core/shell NCs and similar discontinuous red-shift phenomena in the PL spectra were observed. These characteristics indicated that the structure of CdTe/CdS NCs gradually evolved from type-I to type-II, in agreement with transmission electron microscopy (TEM), the tuning of PL quantum yields (QYs), and PL lifetime results.

Original languageEnglish (US)
Pages (from-to)272-277
Number of pages6
JournalCrystEngComm
Volume14
Issue number1
DOIs
StatePublished - Jan 7 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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