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A series of CaLa 1- x LiTeO 6 : x Dy3+ phosphors were synthesized via a conventional solid-state reaction method, and the effects of different Dy3+ doping concentrations on the luminescence properties of the phosphors were studied. The excitation spectrum indicated that these synthesized phosphors had strong absorption bands in near-ultraviolet (n-UV) region in the range from 300 to 500 nm. There were two sharp emission peaks in the visible region, which were located at 483 nm, 574 nm, corresponding to transitions of 4F 9/2 →6H 15/2 (magnetic dipole transition) and 4F 9/2 →6H 13/2 (electric dipole transition), respectively. The phosphor CaLa 0.95 LiTeO 6 :0.05Dy3+ shows superior thermal stability. When the temperature rises to 425 K, the luminous intensity remains at 79% compared with the initial intensity of 300 K. These results demonstrate that the CaLa 1- x LiTeO 6 : x Dy3+ phosphors have great potential as a single-phase luminescence material for near-ultraviolet (n-UV) excitation. [ABSTRACT FROM AUTHOR]

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]