Abstract
A series of anorthic phased Er3+/Yb3+/Li+/K+: ZnMoO4 phosphors have been synthesized by solid state reaction method. Under 980 nm excitation, Er3+-Yb3+codoped phosphors exhibit intense green emission at ~531 nm/~553 nm corresponding to the 2H11/2/4S3/2 → 4I15/2 and weak blue and red emissions at ~408 nm, ~474 nm and ~656 nm corresponding to the 2H9/2 → 4I15/2, 4F7/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions, respectively. The multipolar interaction is found responsible for the concentration quenching. Furthermore, with incorporating the charge compensating agents Li+/K+ the UC emission intensity as well as temperature sensing performance have been perceptibly improved compared to the Er3+-Yb3+ phosphors. The fluorescence intensity ratio (FIR) technique have been performed to the thermally coupled (2H11/2, 4S3/2) levels and Stark sublevels (2H11/2, 4S3/2(I) &2H11/2, 4S3/2(II)) to confirm the temperature sensing ability of the phosphors. The maximum sensitivity corresponding to the 2H11/2, 4S3/2(I) → 4I15/2 &2H11/2, 4S3/2(II) → 4I15/2 transitions from the Stark sublevels have been observed.
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