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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.
|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.|
|Alternative Location: ||http://dx.doi.org/10.1007/s00339-010-6014-4|
|Copyright: ||2011 Springer Verlag|
|Appears in Collections:||Research Papers (LAMP)|
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