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Up-conversion fluorescent materials serve a significant function as the detection materials of temperature sensors. In this study, a series of green-emitting LiLuW 2 O 8 :Yb3+, Er3+ phosphors applied in optical temperature sensing detection were successfully synthesized via the solid-state process in air. The crystal structure, luminescence properties, luminescence mechanism, and optical temperature sensing properties of samples were investigated. LiLuW 2 O 8 :Yb3+, Er3+ phosphor with excitation at 980 nm emits pronounced green emissions owing to the 2H 11/2 → 4I 15/2 and 4S 3/2 → 4I 15/2 transitions of Er3+ ions. The whole emission processes of LiLu 0.72 W 2 O 8 :0.24 Yb3+, 0.04Er3+ sample are all two-photon processes. Moreover, we apply thermal coupling levels (2H 11/2 , 4S 3/2) for temperature sensing and the value of sensing sensitivity can reach the maximum of about 1.41% K−1. All the experimental results imply that LiLuW 2 O 8 :Yb3+, Er3+ phosphors show good potential in temperature sensing. • Novel LiLuW 2 O 8 :Yb3+, Er3+ phosphors were successfully prepared for the first time. • The crystal structure and photoluminescence properties were investigated in detail. • The LiLuW 2 O 8 :Yb3+, Er3+ phosphors show high sensitivity for temperature sensing, and the S r was found to be as high as 1.41% K−1. • The present phosphors could have potential application in optical temperature sensors. [ABSTRACT FROM AUTHOR]