Excited State Dynamics and Luminescence Pressure Dependence of the 3d^2 Electronic Cross-over System V^3+:Cs_2NaYBr_6
Abstract
We report on the luminescence and excited state dynamics of the 3d^2 electronic cross-over system V^3+:Cs_2NaYBr_6. At ambient pressure the ^3T_2g level is the lowest meta-stable excited state and V^3+ exhibits broad band luminescence. At pressures above 15 kbar the ^3T_2g level is higher in energy than the ^1T_2g and the luminescence is narrow. The electronic reordering of levels occurs at ∼13 kbar. There is a corresponding 60-fold increase in the lifetime of the emitting level from ambient pressure to the highest pressure achieved, 33.0 kbar. The broad luminescence band maximum blue-shifts at a higher rate, 41.6 cm-1/kbar, than the ^3T_2g electronic origin, 14.3 cm-1/kbar. The energy difference between ^3T_2g and ^1T_2g is estimated to be -259 cm-1 at ambient pressure and varies with changing pressure at a rate of 20.0 cm-1/kbar.
- Publication:
-
APS Southeastern Section Meeting Abstracts
- Pub Date:
- October 2002
- Bibcode:
- 2002APS..SES.NB002M