Red-to-Ultraviolet Emission Tuning of Two-Dimensional Gallium Sulfide/Selenide
- Authors
- Jung, Chan Su; Shojaei, Fazel; Park, Kidong; Oh, Jin Young; Im, Hyung Soon; Jang, Dong Myung; Park, Jeunghee; Kang, Hong Seok
- Issue Date
- 10월-2015
- Publisher
- AMER CHEMICAL SOC
- Keywords
- GaS; GaSe; monolayers; nanosheets; chemical vapor transport; first-principles calculation
- Citation
- ACS NANO, v.9, no.10, pp.9585 - 9593
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS NANO
- Volume
- 9
- Number
- 10
- Start Page
- 9585
- End Page
- 9593
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92388
- DOI
- 10.1021/acsnano.5b04876
- ISSN
- 1936-0851
- Abstract
- Graphene-like two-dimensional (2D) nanostructures have attracted significant attention because of their unique quantum confinement effect at the 2D limit. Multi layer nanosheets of GaS GaSe alloy are found to have a band gap (E-g) of 2.0-2.5 eV that linearly tunes the emission in red-to-green. However, the epitaxial growth of monolayers produces a drastic increase in this E-g to 3.3-3.4 eV, which blue-shifts the emission to the UV region. First-principles calculations predict that the E-g of these GaS and GaSe monolayers should be 3.325 and 3.001 eV, respectively. As the number of layers is increased to three, both the direct/indirect E-g decrease significantly; the indirect E-g approaches that of the multilayers. Oxygen adsorption can cause the direct/indirect E-g of GaS to converge, resulting in monolayers with a strong emission. This wide E-g tuning over the visible-to-UV range could provide an insight for the realization of full-colored flexible and transparent light emitters and displays.
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Collections - Graduate School > Department of Advanced Materials Chemistry > 1. Journal Articles
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