Mid-Infrared Intraband Transition of Metal Excess Colloidal Ag2Se Nanocrystals

Mihyeon Park, Dongsun Choi, Yoonchang Choi, Hang Beum Shin, Kwang Seob Jeong

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


Steady-state intraband transition, which is a promising electronic transition of a colloidal quantum dot along with the band-gap transition, had been a long-standing challenge. The steady-state intraband transition occurring between discrete electronic states in the conduction band of a colloidal nanocrystal has been reported only from mercury chalcogenide nanocrystals for the past few years. Concerns about the toxicity of the mercury compound necessitate a new nontoxic system exhibiting a steady-state intraband transition. Here we present the steady-state intraband absorption and photoluminescence of Ag2Se colloidal nanocrystals under ambient conditions. The mid-IR intraband transition is carefully investigated by means of FT-IR emission spectroscopy, spectroelectrochemistry, compositional analysis, and transfer characteristics. Especially, the mid-IR intraband photoluminescence of the Ag2Se colloidal nanocrystal will open new avenues in the use of quantum-confined colloidal systems for mid- and long-wavelength infrared light sources along with the band-gap transition that has been investigated for the last three decades.

Original languageEnglish
Pages (from-to)1907-1911
Number of pages5
JournalACS Photonics
Issue number5
Publication statusPublished - 2018 May 16


  • infrared-spectroelectrochemistry
  • mid-IR intraband photoluminescence
  • silver selenide nanocrystals
  • thin-film transistor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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