Phys. Rev. Lett. 99, 027403 (2007) [4 pages]Pressure-Induced Two-Color Photoluminescence in MnF2 at Room TemperatureReceived 17 January 2007; published 12 July 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.027403
DOI:
10.1103/PhysRevLett.99.027403
PACS:
78.55.−m, 71.35.−y, 71.70.Gm, 81.40.Vw
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