| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9586277 | Journal of Luminescence | 2005 | 6 Pages |
Abstract
PbS quantum dots of average size 10Â nm are encapsulated in a matrix (polyvinyl alcohol (PVA)) following chemical route. They are irradiated with 160Â MeV Ni12+ ion beam with fluences 1012-1013Â ions/cm2. Red shift in the absorption response in the optical absorption spectra reveal size enhancement of the quantum dots after irradiation and was confirmed by transmission electron microscopy (TEM). Photoluminescence (PL) study was carried out with excitation wavelength 325Â nm on both unirradiated and irradiated samples at different fluences and fluence-dependent surface states and excitonic emission is observed in the PL study. The Huang-Rhys coupling constant decreases significantly after swift heavy ion (SHI) irradiation and shows a decreasing trend with increase in ion fluence.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
S. Chowdhury, D. Mohanta, G.A. Ahmed, S.K. Dolui, D.K. Avasthi, A. Choudhury,