Abstract
Multi-functional up-conversion (UC) phosphors are highly desirable for many potentially technological applications. Here, Er3+- and Yb3+-doped SrBi4Ti4O15 (SBT:xEr3+/yYb3+) UC nanoparticles (NPs) have been successfully synthesized for the first time by a convenient EDTA-citrate approach. The structures and morphologies were characterized by powder X-ray diffraction, Fourier transform infrared reflectivity spectra, scanning electron microscopy, and transmission electron microscopy. Under 980 nm excitation, SBT:xEr3+/yYb3+ UCNPs exhibited bright green and weak red emissions. The UC emission properties were disclosed to be tightly dependent on the Yb3+ and Er3+ concentration and the involved UC mechanism was discussed. More importantly, the noncontact optical thermometric ability were assessed based on the thermo-responsive fluorescence intensity ratio (FIR) technique and the maximum sensitivity (Smax) of SBT:0.15Er3+/0.15Yb3+ UCNPs is about 0.0036 K–1. Excellent repeatability and stability were proven by the thermal-cycling measurements. Furthermore, prominent photo-thermal (PT) effect was obtained with the temperature coefficients (η) being 0.24 and 0.49 °C∙mm2/mW for SBT:0.15Er3+/0Yb3+ and SBT:0.15Er3+/0.15Yb3+ UCNPs, respectively, which showed that the incorporation of Yb3+ was a promising strategy to improve the PT capability. In addition, regularly dynamic response of the PT agent under periodic laser stimulation was also observed. These results imply that SBT:xEr3+/yYb3+ UCNPs could be potentially utilized in thermometers and PT agents.
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