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Title: Spectrally broadened excitonic absorption and enhanced optical nonlinearities in Dy3+-doped ZnO nanoparticles
Authors: Karthikeyan, B.
Suchand Sandeep, C.S.
Pandiyarajan, T.
Venkatesan, P.
Philip, Reji
Issue Date: Jan-2011
Publisher: Springer Verlag
Citation: Applied Physics A: Materials Science and Processing, 2011, Vol.102, p115
Abstract: We have synthesized Dy3+-doped ZnO nanoparticles at room temperature through the sol-gel method. X-ray diffraction and Scanning electron microscopic studies confirm the crystalline nature of the particles. Excitonic absorption of ZnO shows three different bands, and we observe that incorporation of Dy3+ results in the shifting and broadening of the n=1 absorption band of ZnO. Photoluminescence studies done at the excitation wavelength of 335 nm show broad emission containing five different bands. Open-aperture z-scan studies done at 532 nm using 5 ns laser pulses show an optical limiting behavior, which numerically fits to a three-photon type absorption process. The nonlinearity is essentially resonant, as it is found to increase consistently with Dy3+ concentration. This feature makes Dy3+-doped ZnO a flexible optical limiter for potential device applications.
Description: Restricted Access.
ISSN: 0947-8396
1432-0630 (online)
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Copyright: 2011 Springer Verlag
Appears in Collections:Research Papers (LAMP)

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