Broadband near-infrared to visible upconversion in quantum dot-quantum well heterostructures

Ayelet Teitelboim, Dan Oron

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Upconversion is a nonlinear process in which two, or more, long wavelength photons are converted to a shorter wavelength photon. It holds great promise for bioimaging, enabling spatially resolved imaging in a scattering specimen and for photovoltaic devices as a means to surpass the Shockley-Queisser efficiency limit. Here, we present dual near-infrared and visible emitting PbSe/CdSe/CdS nanocrystals able to upconvert a broad range of NIR wavelengths to visible emission at room temperature. The synthesis is a three-step process, which enables versatility and tunability of both the visible emission color and the NIR absorption edge. Using this method, one can achieve a range of desired upconverted emission peak positions with a suitable NIR band gap.

Original languageEnglish
Pages (from-to)446-452
Number of pages7
JournalACS Nano
Volume10
Issue number1
DOIs
Publication statusPublished - Jan 26 2016

Keywords

  • Interband absorption
  • Intraband absorption
  • Near-infrared
  • Quantum dot-quantum well
  • Semiconductor nanocrystals
  • Upconversion

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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