26 March 2014 Three- and two-photon upconversion luminescence switching in Tm3+/Yb3+-codoped sodium niobate nanophosphor
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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.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Kagola Upendra Kumar, Kagola Upendra Kumar, Wagner Ferreira da Silva, Wagner Ferreira da Silva, Kummara Venkata Krishnaiah, Kummara Venkata Krishnaiah, Chalicheemalapalli K. Jayasankar, Chalicheemalapalli K. Jayasankar, Carlos Jacinto, Carlos Jacinto, } "Three- and two-photon upconversion luminescence switching in Tm3+/Yb3+-codoped sodium niobate nanophosphor," Journal of Nanophotonics 8(1), 083093 (26 March 2014). https://doi.org/10.1117/1.JNP.8.083093 . Submission:

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