Ghosh, Pushpal ; Sadhu, Suparna ; Sen, Tapasi ; Patra, Amitava (2008) Upconversion emission of BaTiO3: Er nanocrystals Bulletin of Materials Science, 31 (3). pp. 461-465. ISSN 0250-4707
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Official URL: http://www.ias.ac.in/describe/article/boms/031/03/...
Related URL: http://dx.doi.org/10.1007/s12034-008-0072-7
Abstract
Here, we report the dopant concentration and pump-power dependence upconversion emission properties of erbium doped BaTiO3 nanocrystals derived from sol-emulsion-gel method. Green (550 nm) and red (670 nm) upconversion emissions were observed at room temperature from the 4S3/2 and 4F9/2 levels of Er3+: BaTiO3 nanocrystals. It is found that at 850 mW of cw excitation power (at 980 nm) the total luminescence was 17130 Cd/m2 for 1000°C heated 0.25 mol% Er-doped BaTiO3 nanocrystals. It is worthwhile to mention that the unusual power-dependent upconversion luminescence (saturation) is observed at higher dopant concentration (2.5 mol%) and high pump power. Our analysis confirms that the depletion of the excited state is responsible for the relevant fluorescence upconversion. We have again confirmed that a twophoton excited state absorption process occurs for all samples.
Item Type: | Article |
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Source: | Copyright of this article belongs to Indian Academy of Sciences. |
Keywords: | Nanocrystals; Erbium; Upconversion; Two-Photon Excitation |
ID Code: | 104821 |
Deposited On: | 01 Dec 2017 11:15 |
Last Modified: | 01 Dec 2017 11:15 |
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