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.
URI:	http://hdl.handle.net/2289/4758
ISSN:	0947-8396 1432-0630 (online)
Alternative Location:	http://dx.doi.org/10.1007/s00339-010-6014-4 http://adsabs.harvard.edu/abs/2011ApPhA.102..115K
Copyright:	2011 Springer Verlag
Appears in Collections:	Research Papers (LAMP)

Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.