Abstract
AbstractHexagonal Er3+/Yb3+ co‐doped LaZrTa3O11 (LZTO) phosphor was prepared by molten salt synthesis with B2O3 flux. Holding temperature, holding time, solute and solvent ratio were regulated. The green upconversion luminescence (UCL) integral intensity of the optimal sample can reach 29.2% of β‐NaYF4:Er3+/Yb3+ under 980 nm laser excitation. This outstanding pure green UCL is due to the low phonon energy, Er3+/Yb3+ monolayer (2D) distribution, asymmetry of Er3+/Yb3+ doped lattice sites, and low oxygen vacancy. The maximum relative temperature sensitivity attains 0.01221 K−1 at 303 K by employing luminescence intensity ratio (LIR) technique. LZTO:Er3+/Yb3+ phosphor can be used in temperature sensing.
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