Maciel, Glauco S. ; Alencar, Márcio A. R. C. ; de Araújo, Cid B. ; Patra, Amitava (2010) Upconversion emission of BaTiO3:Er3+ nanocrystals: Influence of temperature and Surrounding Medium Journal of Nanoscience and Nanotechnology, 10 (3). pp. 2143-2148. ISSN 1533-4880
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Official URL: http://www.ingentaconnect.com/content/asp/jnn/2010...
Related URL: http://dx.doi.org/10.1166/jnn.2010.2096
Abstract
Here, we report the role of crystallite size and surrounding medium on the upconversion emission of Er3+ in BaTiO3 oxide nanocrystals. The samples were prepared by sol-emulsion-gel method and heat-treated at two different temperatures yielding powders containing nanoparticles of different sizes. Green (550 nm) and red (660 nm) upconversion emission were observed at room temperature from the 4S3/2 and 4F9/2 levels of BaTiO3:Er3+ nanocrystals. The pump power dependence study confirms that all these upconversion emission lines are a two-photon absorption process. We observed that the luminescence lifetime is shorter for the sample containing smaller particles. Optical thermometry experiments were performed in air, water and glycerol in a temperature range from 27.1 up to 47.1 °C aiming to use this material as a biological temperature sensor.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Scientific Publishers. |
| Keywords: | Fluorescence Intensity Ratio; Nanocrystals; Two-Photon Absorption; Upconversion |
| ID Code: | 104772 |
| Deposited On: | 01 Dec 2017 11:07 |
| Last Modified: | 01 Dec 2017 11:07 |
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