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Yb3+/Tm3+ co-doped NaNbO3 nanocrystals as three-photon-excited luminescent nanothermometers

2015; Elsevier BV; Volume: 213; Linguagem: Inglês

10.1016/j.snb.2015.01.136

1873-3077

Alexsandro F. Pereira, Upendra Kumar Kagola, W.F. Silva, W.Q. Santos, Daniel Jaque, Carlos Jacinto,

Solid State Laser Technologies

In this paper we report on Thulium/Ytterbium codoped sodium niobate (NaNbO3) colloidal nanocrystals as high resolution luminescent nanothermometers operating under three-photon excitation. The spectral shape of the Thulium (1G4→3H6) luminescence band at 480 nm after 980 nm (Ytterbium) excitation has been analyzed in detail in the biophysical temperature range. It has been found that the population re-distribution among the thermally coupled stark levels could be successfully used for ratiometric thermal sensing. The thermal sensitivity of the three photon excited luminescence has been successfully used to evaluate, in a single-beam experiment, the light induced thermal loading taking place in 940 nm excited NaNbO3:Tm3+/Yb3+ nanocrystals.