Abstract
The Gd2ZnTiO6:Yb3+/Er3+ phosphors (abbreviated as GZT:Yb3+/Er3+) have been successfully prepared by means of the sol-gel method. The GZT:Yb3+/Er3+ phosphor exhibits intense green upconversion (UC) emission bands near 525/547 nm (2H11/2/4S3/2→4I15/2) and weak red UC emission band near 663 nm (4F9/2→4I15/2) upon the 980 nm laser excitation. Furthermore, the sample simultaneously emits near-infrared centered at 1527 nm associated with 4I13/2→4I15/2 transition of Er3+ ions. The high thermal activation energy (0.34 eV) of the GZT:Yb3+/Er3+ phosphor is determined via the temperature dependent luminescence spectra upon the 980 nm laser excitation (low power density: 0.8W/cm2). Two thermally coupled levels (2H11/2/4S3/2) for Er3+ using the fluorescence intensity ratio (FIR) technology were studied in detail. The maximum absolute sensitivity (90.11 × 10−4 K−1 at 539 K) of the targeted phosphor is determined from the experimental results. All results demonstrate a potential of application of as-prepared GZT:Yb3+/Er3+ phosphors in optical thermometry.
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