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Preparation of LiAl0.5Ga4.5O8:Cr3+ phosphor and its temperature sensing property based on PL lifetime
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DOI：10.1016/j.optmat.2026.118266.png)
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Abstract
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• A Ga-rich LiAl0.5Ga4.5O8:Cr3+ phosphor is developed for lifetime-based optical thermometry via host composition engineering. • The optimized phosphor exhibits high PL QYs (∼95% internal, ∼51% external), excellent thermal stability (78% intensity retention at 723 K), and a broad operating range (298–723 K). • A strongly temperature-dependent PL lifetime (1.94 ms .→ 0.06 ms) yields a high relative sensitivity of 1.01% K−1 at 423 K, surpassing most Cr3+-doped phosphors.
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