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Journal of Applied Physics : Blue-green upconversion emission in ZrO2:Yb3+ nanocrystals

By E. de la Rosa, D. Solis, L. A. Díaz-Torres, P. Salas, C. Angeles-Chavez et al

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Book Id: WPLBN0002169348
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 18 November 2008

Title: Journal of Applied Physics : Blue-green upconversion emission in ZrO2:Yb3+ nanocrystals  
Author: E. de la Rosa, D. Solis, L. A. Díaz-Torres, P. Salas, C. Angeles-Chavez et al
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection, Journal of Applied Physics Collection
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Publication Date:
Publisher: American Institute of Physics

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La Rosa, D. Solis, L. A. Díaz-Torres, P. Salas, C. Angeles-Chavez Et A, E. D. (n.d.). Journal of Applied Physics : Blue-green upconversion emission in ZrO2:Yb3+ nanocrystals. Retrieved from http://nationalpubliclibrary.info/


Description
Description: Strong blue-green cooperative upconversion emission was observed under infrared excitation in 70 nm average crystallite size ZrO2:Yb3+ nanocrystals prepared by sol-gel process. The structural characterization was performed by x-ray diffraction and high resolution transmission electron microscopy suggesting that crystalline phase of nanoparticles is controlled by active ion concentration. The cooperative absorption coefficient η ∼ 2.5×10−22 is four orders of magnitude larger than the ones reported from bulk crystals. The highest emission intensity was obtained from the doped sample at 4 mol % and was the result of the simultaneous relaxation of two excited Yb ions. Decay time of the upconverted signal τCUC ≈ 0.310 ms is half from the near infrared effective decay time confirming the cooperative process among Yb ions. Such strong cooperative effect is explained in terms of interaction enhancement due to the diminishing of Yb–Yb separation promoted partly by the surface recombination of nanocrystals.

 

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