Abstract
The optical properties of Mn 2+ ions in Ca 1− x Sr x F 2 and Sr 1− x Ba x F 2 solid solutions have been studied. The positions of the excitation bands corresponding to electronic transitions from the 6A 1g( 6S) ground state of Mn 2+ to different excited states as well as the luminescence emission which corresponds to the 4T 1g ( 4G)→ 6A 1g( 6S) transition, change with the composition of the matrix. These changes have been qualitatively explained in a configurational coordinate model using the Tanabe–Sugano diagram for a d 5 ion in a cubal environment and assuming that there is an increase of the electron–lattice interaction in the mixed crystals with respect to the unmixed ones. The thermal quenching of the photoluminescence has also been studied. The quenching temperature decreases in an almost linear way when the lattice parameter increases. This can be understood assuming that the electron–lattice interaction of the emitting level 4T 1g is different from that of the ground state 6A 1g.
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