Abstract
Abstract Transparent glass ceramics (GCs) containing Sr2LaF7: Yb3+/Er3+ nanocrystals were successfully synthesized through a melt quenching method, and the luminescent properties were studied for optical thermometry. The lifetime and emission intensity of GCs were enhanced obviously after heat treatment, due to the La3+ ions in the lattice of Sr2LaF7 particles with low phonon energy was replaced by Er3+ ions. The red/green emission ratio of Er3+ ion increases with the increasing Yb3+/Er3+ contents. Two green emission bands of Er3+ ion resulting from 2H11/2 and 4S3/2 thermally coupled energy levels (TCELs) exhibit various responses to temperature. Therefore, the luminescence intensity ratio (LIR) technique could be utilized to sense temperature. When the temperature is 510 K, the relative sensitivity SR reaches as high as 0.132% K−1. Such GCs embedded with Sr2LaF7: Yb3+/Er3+ nanocrystals have possible utilization in optical thermometer.
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