Lam, Thi Kieu Giang and Opalinska, A and Chudoba, T and Benkowski, K and Lojkowski, W and Tran, Kim Anh and Nguyen, Thanh Binh and Le, QuocMinh (2010) Preparation and characterization of ZrO 2 :Er 3+ , Yb 3+ nanoparticles using a high pressure assisted soft template. Advances in Natural Sciences: Nanoscience and Nanotechnology, 1 (2). 025008.
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Official URL: http://stacks.iop.org/2043-6262/1/i=2/a=025008
Nanoparticles of ZrO 2 :Er 3+ , Yb 3+ fabricated by a soft template method combined with microwave heating under high pressures were reported for the first time. Nano ZrO 2 :Er 3+ , Yb 3+ in concentrations of 0.1â15 mol% have been fabricated in the presence of soft template agent diethylene glycol or polyethylene glycol in a microwave reactor at pressures up to 55 atm. The average size of the as-synthesized nanoparticles was found to be 5â13 nm. The upconversion luminescence of the ZrO 2 :Er 3+ , Yb 3+ was found in the red region of 630â710 nm and in the green region of 510â570 nm, with excitation by an infrared diode laser at the wavelengths of 830 and 940 nm, respectively. The change in content ratio between monoclinic and tetragonal phases when the annealing temperature increases from 600 to 1200 Â°C was investigated. The tetragonal phase content decreases and disappears for the samples annealed at 1200 Â°C. The increase in the content of the monoclinic phase is suggested to be a main reason for the increase in the upconversion luminescent intensity of nano ZrO 2 :Er 3+ , Yb 3+ .
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||01 Nov 2011 23:29|
|Last Modified:||02 Nov 2011 00:47|
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