Nanoscale Temperature Study of Plasmonic Nanoparticles Using NaYF4:Yb3+:Er3+ Upconverting Nanoparticles
In this chapter, we study the potential of β-NaYF4:Yb3+,Er3+ nanocrystals and decorated β-NaYF4:Yb3+,Er3+ nanocrystals for temperature measurement at the nanoscale. We measure the temperature dependence in the temporal response of the green emission for both the H band (2H11/2 → 4I15/2 transition) and the S band (4S3/2 → 4I15/2 transition) for β-NaYF4:Yb3+,Er3+ nanocrystals and β-NaYF4:Yb3+,Er3+ nanocrystals decorated with 10 nm gold nanoparticles and found that the emission is quenched with temperature. Time-resolved measurements showed that the decay lifetime of UCNP/GNPs is bi-exponential with a dominant decay time an order of magnitude faster than the longer decay time around 300 μs. The UCNPs have a single exponential decay with a long decay time of ~175 μs. We measure the steady-state emission from the H and S band for UCNPs and UCNP/GNPs for temperatures between 300 and 450 K and obtain a linear relationship between the calculated and measured temperatures showing that quenching of the H and S bands does not affect the ability of UCNP/GNPs and UCNPs to be used as thermal sensors. This chapter is reprinted (adapted) with permission from ACS Photonics, 2017, 4(7), pp 1864–1869. Copyright 2017 American Chemical Society.
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