Luminescence of BaBr2:Eu under hydrostatic pressure |
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Authors: | Th. Trö sterS. Schweizer,M. SecuJ.-M. Spaeth |
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Affiliation: | Department of Physics, University of Paderborn, Warburger Strasse 100, D-33095 Paderborn, Germany |
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Abstract: | Luminescence spectra of BaBr2:Eu2+ have been measured under pressures up to 27 GPa at room temperature. In the low-pressure range a red-shift of the 5d-4f transition of −225 cm−1/GPa is observed. From 3 to 10 GPa a phase mixture of the original orthorhombic phase and the high-pressure monoclinic phase gives rise to two luminescence bands. Above 10 GPa the crystal is completely transformed to its high-pressure phase where two different Eu2+ sites exist of which, however, only one 5d-4f transition is detected. This transition exhibits a red-shift of −200 cm−1/GPa. The shifts are compared with other literature data. |
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Keywords: | Eu2+ luminescence BaBr2 |
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