Selective enhancement of green upconversion luminescence of Er–Yb: NaYF4 by surface plasmon resonance of W18O49 nanoflowers and applications in temperature sensing

Selective enhancement of green upconversion luminescence of Er–Yb: NaYF₄ by surface plasmon resonance of W₁₈O₄₉ nanoflowers and applications in temperature sensing

Li Ang^{1, 2, 3}, Wu Jin-Lei^{2, 3}, Xu Xue-Song^{1, 2}, Liu Yang³, Bao Ya-Nan^{2, 3}, Dong Bin^{3, †}

(color online) (a) Green UC emission spectra of Er–Yb: NaYF₄/W₁₈O₄₉ up-conversion luminescence nanoflower particles at 350 K, 550 K, and 625 K. (b) Plot of logarithmic FIR versus inverse absolute temperature. (c) FIR of the ²H_11/2/⁴S_3/2 → ⁴I_15/2 transitions as a function of temperature. (d) Sensor sensitivity as a function of temperature in a range of 250–625 K.