Abstracts 2002

Abstract of Publication No. 416

Oliver S. Wenger and Hans U. Güdel
Luminescence spectroscopy of V3+-doped Cs2NaYCl6 under high pressure
Chem. Phys. Lett. 354, 75-81 (2002)      Full Text (PDF)      DOI-Link     

Abstract: The luminescence behavior of 1% V3+:Cs2NaYCl6 at room temperature is studied as a function of hydrostatic pressure. At ambient pressure the V3+ 3T2g excited state origin lies 234 cm1 above the 1T2g first excited state. At room temperature the two states are in thermal equilibrium, and spin-allowed 3T2g 3T1g emission is dominant. Pressure increases the energetic separation of 1T2g and 3T2g, leading to a decreasing 3T2g steady state population at constant temperature. This manifests itself in an increasing relative amount of spin-forbidden 1T2g 3T2g luminescence, as evidenced by the occurrence of sharp luminescence features and an increase in the luminescence decay time at higher pressures.

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