Pressure-Induced Two-Color Photoluminescence in MnF2 at Room Temperature
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A novel two-color photoluminescence (PL) is found in MnF2 at room temperature under high pressure.
Contrary to low-temperature PL, PL at room temperature is unusual in transition-metal concentrated
materials like MnF2, since the deexcitation process at room temperature is fully governed by energy
transfer to nonradiative centers. We show that room-temperature PL in MnF2 originates from two distinct
Mn2 emissions in the high-pressure cotunnite phase. The electronic structure and the excited-state
dynamics are investigated by time-resolved emission and excitation spectroscopy at high pressure.
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