Luminescent properties of the potassium zinc phosphates of composition K1−xTlxZn(PO3)3

The role of the Ca vacancy in the determination of the europium position in the energy gap, its valence state and spectroscopic properties in KCa(PO3)3

“…IR spectra: n as (PO The numbers of bands observed in the multi-component patterns of these spectra fit well to those reported in the earlier works for the REP 3 O 9 type compounds [11][12][13][14] and predicted theoretically. These data confirm that the structure of the studied compounds agrees with that proposed by the XRD studies.…”

“…The stretching vibrations of the PO 2 group vibrations are expected in the 1100-1200 cm À1 and 1200-1300 cm À1 ranges, respectively, for the symmetric and asymmetric modes; and the bending vibrations in the regions 300-400 and 400-550 cm À1 , respectively. [11][12][13][14] The vibrations of the POP oxygen bridges are observed in the regions: asymmetric stretching: 1000-1060 cm À1 , symmetric stretching 600-800 cm À1 and bending 300-350 cm À1 .…”