Mid-Infrared Intraband Transition of Metal Excess Colloidal Ag 2 Se Nanocrystals

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

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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 Ag 2 Se 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 Ag 2 Se 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
Volume5
Issue number5
DOIs
Publication statusPublished - 2018 May 16

Fingerprint

Nanoparticles
Nanocrystals
nanocrystals
Electron transitions
Metals
Infrared radiation
metals
Photoluminescence
Energy gap
Mercury compounds
Mercury Compounds
Spectroelectrochemistry
Quantum Dots
Wavelength
Emission spectroscopy
Electronic states
Conduction bands
Mercury
Semiconductor quantum dots
Toxicity

Keywords

  • 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

Cite this

Mid-Infrared Intraband Transition of Metal Excess Colloidal Ag 2 Se Nanocrystals . / Park, Mihyeon; Choi, Dongsun; Choi, Yoonchang; Shin, Hang Beum; Jeong, Kwang Seob.

In: ACS Photonics, Vol. 5, No. 5, 16.05.2018, p. 1907-1911.

Research output: Contribution to journalArticle

Park, Mihyeon ; Choi, Dongsun ; Choi, Yoonchang ; Shin, Hang Beum ; Jeong, Kwang Seob. / Mid-Infrared Intraband Transition of Metal Excess Colloidal Ag 2 Se Nanocrystals In: ACS Photonics. 2018 ; Vol. 5, No. 5. pp. 1907-1911.
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