Abstract

Broadband near-infrared luminescence (NIR) from 720 to 950 nm, which is located in the biological window, has been successfully achieved from ${\mathrm{Nd}}^{3+}/{\mathrm{Yb}}^{3+}$ codoped hexagonal ${\mathrm{NaYF}}_4$ nanoparticles when excited by 980 nm diode laser. Using the fluorescence intensity ratio technique, the temperature sensing behavior of ${\mathrm{Nd}}^{3+}$ NIR emissions exhibits various advantages over other rare earth ion based nanothermometers. The light-induced thermal loading for the 980 nm excited ${\mathrm{NaYF}}_4\text{:}{\mathrm{Nd}}^{3+}/{\mathrm{Yb}}^{3+}$ was also investigated. The results illustrate the multifunctionality of such fluoride nanoparticles, which could simultaneously act as the luminescent nanothermometers and nanoheaters and find potential application in photothermal therapy.

© 2015 Optical Society of America

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