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This work investigates phase transition (PT) and excited-state-crossover (ESCO) effects on the photoluminescence (PL) properties of LiCaAlF 6 : Cr 3+ . The structural requirements for changing the Cr 3+ PL behavior from a broad-band emission at 1.59eV (781nm) at ambient conditions, to ruby-like narrow-line emission at 1.87eV (663nm) are analyzed in the 0–35GPa range. We report...
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