Abstract
The infrared absorption spectrum and the visible emission spectra of Cs 2NaTbCl 6 are used to provide assignments for the energy levels of this cubic elpasolite system, up to 21 000 cm −1. The spectra have been interpreted in detail, particularly with respect to the vibrational sidebands of the electronic transitions. Together with the measured oscillator strengths from the 5 D 0 ← 7 F 0 absorption spectrum of Cs 2NaEuCl 6, the data are used in a spectral overlap model to calculate the energy transfer rate from the 5D 4 term manifold of Tb 3+ to the 5D 0 term of Eu at 77 K. The calculated rate is 1.4 × 10 6 times smaller than the previously reported [1] energy transfer rate, so that it appears unlikely that the 5D 4 luminescence quenching in Cs 2NaTbCl 6:EuCl 6 3− is due to the proposed cross-relaxation mechanism.
Published Version
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