Mid-Infrared Intraband Transition of Metal Excess Colloidal Ag2Se Nanocrystals
- Authors
- Park, Mihyeon; Choi, Dongsun; Choi, Yoonchang; Shin, Hang-beum; Jeong, Kwang Seob
- Issue Date
- 5월-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- silver selenide nanocrystals; mid-IR intraband photoluminescence; infrared-spectroelectrochemistry; thin-film transistor
- Citation
- ACS PHOTONICS, v.5, no.5, pp.1907 - 1911
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS PHOTONICS
- Volume
- 5
- Number
- 5
- Start Page
- 1907
- End Page
- 1911
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/75657
- DOI
- 10.1021/acsphotonics.8b00291
- ISSN
- 2330-4022
- 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 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.
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