Coated Semiconductor Nanoparticles: The CdS/PbS System's Photoluminescence Properties

H. S. Zhou, H. Sasahara, Itaru Homma, H. Komiyama, Joseph W. Haus

Research output: Contribution to journalArticlepeer-review

101 Citations (Scopus)

Abstract

The photoluminescence (PL) spectra from colloidal solution of coated semiconductor CdS/PbS nanoparticles, which are synthesized by a cation-exchanging colloidal method, are measured at room temperature. The PL spectra from S vacancies (Vs) and Cd-S composite vacancies (VCd-S) in CdS and CdS/PbS nanoparticles have been investigated. The PL of Vs can be quenched only by the Pb caption modified in the surface of CdS. The PL of VCd-S in CdS nanoparticles appears in about 1100 nm. The PL of VCd-S in CdS/PbS nanoparticles shifts to longer wavelengths as the quantity of PbS increases. The shift and intensity variation of the PL peak from VCd-S in CdS/PbS can be explained by a quantum confinement model of coated nanoparticles; the excited energy gap (HOMO-LUMO) is not only dependent on the size of the particles but also strongly dependent on the core/shell ratio of the coated nanoparticles. The PL energy gap (LUMO-VCd-S) is also strongly dependent on the core/shell ratio.

Original languageEnglish
Pages (from-to)1534-1541
Number of pages8
JournalChemistry of Materials
Volume6
Issue number9
DOIs
Publication statusPublished - 1994 Sep 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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