Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5403221 | Journal of Luminescence | 2008 | 6 Pages |
Abstract
We have investigated temporal behavior of the photoluminescence (PL) spectra of thin films containing CdSe/ZnS quantum dots irradiated by 532 nm laser radiation and gamma-rays. Under â¼100 W/cm2 laser radiation, the PL intensity (IPL) increases with irradiation time upto about 500 s and thereafter declines linearly. The wavelength of the PL emission (λpeak) exhibits a blue-shift with exposure time. Upon simultaneous irradiation by 100 W/cm2 532-nm laser, as well as 0.57 and 1.06 MeV gamma-rays, the temporal behaviors of both IPL and λpeak are significantly different; IPL increases to a saturation level, and the magnitude of the blue-shift in λpeak is reduced. We discuss possible mechanisms underlying these results.
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Authors
Suresh C. Sharma, Jay Murphree, Tonmoy Chakraborty,