Electric field effects on photoluminescence of CdSe nanoparticles in a PMMA film

Takakazu Nakabayashi, Ruriko Ohshima, Nobuhiro Ohta

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

External electric field effects on spectra and decay of photoluminescence (PL) as well as on absorption spectra were measured for CdSe nanoparticles in a poly(methyl methacrylate) (PMMA) film. Electrophotoluminescence (E-PL) spectra as well as electroabsorption spectra show a remarkable Stark shift which depends on the particle size, indicating a large electric dipole moment in the first exciton state. The E-PL spectra also show that PL of CdSe is quenched by application of electric fields, and the magnitude of the field-induced quenching becomes larger with increasing size. The PL decay profiles observed in the absence and presence of electric field show that the field-induced quenching of PL mainly originates from the field-induced decrease in population of the emitting state prepared through the relaxation from the photoexcited state.

Original languageEnglish
Pages (from-to)152-167
Number of pages16
JournalCrystals
Volume4
Issue number2
DOIs
Publication statusPublished - 2014 Jun 23

Keywords

  • CdSe
  • Electric field effects
  • Field-induced quenching
  • Photoluminescence

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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