Abstract
Tb3+/Eu3+ co-doped transparent bulk glass ceramics containing orthorhombic β-YF3 nanocrystals were successfully synthesized by melt-quenching and subsequent heating. The partition of the active centers into the YF3 crystalline lattice was confirmed by elemental mapping in the scanning transmission electron microscope, emission spectra and decay curves. As a consequence, Tb3+ → Eu3+ energy transfer was demonstrated to be more efficient in the glass ceramic than in the precursor glass, which resulted in color tunable luminescence by simply modifying Eu3+ content and induced the linearly temperature-dependent fluorescence intensity ratio between the Tb3+: 5D4 → 7F5 transition and the Eu3+: 5D0 → 7F4 one in the Tb3+/Eu3+ co-doped glass ceramic. It is expected that the investigated glass ceramic might be a promising candidate for solid-state lighting as well as optical temperature sensor.
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