Abstract
The chromium doped (CH 3) 2NH 2Al(SO 4) 2·6H 2O crystal was obtained from solution by a slow evaporaion method at 303 K and investigated in the ferroelectric phase below 150 K using optical spectroscopy. It was found that the Cr 3+ ions in the crystal are situated in a strong crystal field in which the 2E state is the lowest. A single narrow R line associated with the 2E− 4A 2 phosphorescence indicates an undistorted octahedral Cr 3+ site in the host lattice. The OH bonds in the first coordination sphere induce efficient nonradiative transitions from the 2E emitting state and the Cr 3+ emission is completely quenched at temperatures above 150 K.
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