Synthesis of colloidal Zn(Te,Se) alloy quantum dots

H. Asano, K. Arai, M. Kita, T. Omata

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Colloidal Zn(Te1-xSex) quantum dots (QDs), which are highly mismatched semiconductor alloys, were synthesized by the hot injection of an organometallic solution, and the composition and size dependence of their optical gap were studied together with the theoretical calculation using the finite-depth-well effective mass approximation. The optical gaps exhibited considerable negative deviation from the mole fraction weighted mean optical gaps of ZnTe and ZnSe, i.e. a large optical gap bowing was observed, similar to the bulk and thin-film alloys. The composition and size dependence of optical gaps agreed well with theoretically calculated ones employing a bowing parameter similar to that of the bulk alloys; therefore, the extent of the optical gap bowing in these alloy QDs is concluded to be the same as that in bulk and thin-film alloys. The optical gaps of Zn(Te1-xSex) QDs with diameters of 3.5-5 nm, where x ∼ 0.35, were close to the energy corresponding to green light, indicating that those QDs are very promising as green QD-phosphors.

Original languageEnglish
Article number106501
JournalMaterials Research Express
Volume4
Issue number10
DOIs
Publication statusPublished - 2017 Oct

Keywords

  • Alloy
  • II-VI semiconductors
  • bowing
  • optical gap
  • quantum dots

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

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