Impact of visible light illumination on ultraviolet emission from ZnO nanocrystals
- Authors
- Kurbanov, Saidislam S.; Panin, Gennady N.; Kim, Tae Whan; Kang, Tae Won
- Issue Date
- Jul-2008
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.78, no.4, pp.1 - 6
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 78
- Number
- 4
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/178171
- DOI
- 10.1103/PhysRevB.78.045311
- ISSN
- 2469-9950
- Abstract
- The influence of a visible Ar+-laser (488 nm) illumination on photoluminescence (PL) from ZnO nanocrystals excited by He-Cd laser (325 nm) at various excitation intensities and temperatures was investigated. A reversible quenching of the UV near-band-edge emission under Ar+-laser illumination was observed. The quenching effect increases with decreasing temperature and He-Cd laser intensity at fixed intensity of Ar+-laser. It is found that the recovery time of the initial PL intensity depends on temperature and Ar+-laser exposure time. At room temperature the PL restored the initial intensity instantly after the turning off the Ar+-laser illumination; however at 10 K this process took several minutes. The proposed mechanism of the observed quenching effect implies an appearance of the additional recombination channel under a visible light illumination due to the recharging of oxygen-vacancy states in the surface depletion zone.
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