Abstract
Monitoring temperature without contact has been paid much attention in industrial production and scientific research. Here, a series of Bi2Ti2O7:Yb3+/Ho3+ compounds (4:1, 6:1, 8:1, 10:1, 15:1, 20:1) with high temperature sensitivity were prepared via an electrospinning route. The crystal, morphology and elemental distribution were characterized by XRD, SEM and TEM. A general strategy for temperature sensing properties through inspecting the upconversion spectra was reported. It is demonstrated that the nanofibers exhibit intense and high purity green emission and the emission bands are situated at 540 nm, 665 nm and 750 nm, which was ascribed to 5F4/5S2→5I8, 5F5→5I8 and 5F4/5S2→5I7 transitions, respectively. The maximum relative sensitivity is calculated to be 2.44% at 498 K, obtained from the temperature-dependent spectra by recording in the range of 298–498 K. The samples also provide excellent repeatability and chromaticity stability. More remarkably, the optical heating ability that monitors the temperature change of the tissue injected with the Bi2Ti2O7:Yb3+/Ho3+ nanofibers were investigated. The temperature rises about 15 K after being irradiated by 808 nm laser with the pump power of 0.97 W/cm2 for 15 min. All the results highlight that the novel Bi2Ti2O7:Yb3+/Ho3+ compounds have great potential for temperature-sensing and photothermal therapy.
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