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Journal of Nanophotonics

Three- and two-photon upconversion luminescence switching in Tm3+/Yb3+-codoped sodium niobate nanophosphor
Author(s): Kagola Upendra Kumar; Wagner Ferreira da Silva; Kummara Venkata Krishnaiah; Chalicheemalapalli K. Jayasankar; Carlos Jacinto
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Paper Abstract

Intense infrared-to-visible upconversion (UC) emission in Tm 3+ /Yb 3+ -codoped sodium niobate (NaNbO 3 ) nanocrystals under resonant excitation at 976 nm is presented. The results showed that by increasing the pump power/intensity, a strong reduction is observed at the 800/480  nm emitted intensity ratio, characterizing what can be denominated as laser pump power-induced color tunability or luminescent switching. The physical origin is discussed with a focus on tailoring of luminescent switchers to operate at a large pump power range and, indeed, it is intrinsically associated with the competition of the two- and three-photon UC processes and with highly efficient UC emissions in the investigated material. The effect of Yb 3+ -ion concentration along with the theoretical aspects on luminescence switching has been investigated. The results obtained here could be useful in the field of sensors and networks for optical processing and optical communications.

Paper Details

Date Published: 26 March 2014
PDF: 10 pages
J. Nanophoton. 8(1) 083093 doi: 10.1117/1.JNP.8.083093
Published in: Journal of Nanophotonics Volume 8, Issue 1
Show Author Affiliations
Kagola Upendra Kumar, Univ. Federal de Alagoas (Brazil)
Wagner Ferreira da Silva, Univ. Federal de Alagoas (Brazil)
Kummara Venkata Krishnaiah, Sri Venkateswara Univ. (India)
Chalicheemalapalli K. Jayasankar, Sri Venkateswara Univ. (India)
Carlos Jacinto, Univ. Federal de Alagoas (Brazil)

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