Funct. Mater. 2015; 22 (4): 440-445.
Origin of intrinsic luminescence in oxide crystals containing Bi cations and XO4 (X = P, Mo, W) molecular anionic groups
T. Shevchenko National University of Kyiv, 64 Volodymyrska St., 01601 Kyiv, Ukraine
Intrinsic photoluminescence (PL) of BiPO4, K3Bi5(PO4)6, K2Bi(PO4)(MoO4), KBi(MoO4)2, K5Bi(MoO4)4, K2Bi(PO4)(WO4) and K6.5Bi2.5W4P6O34 crystals is studied in 2.8-14 eV range of excitation photon energies. The electronic band structures of the crystals are calculated by the Full-Potential Linear Augmented Plane Wave Method. Origin of intrinsic luminescence in studied compounds is analyzed on the ground of obtained experimental and computational results. It is found that PL emission components of BiPO4, K3Bi5(PO4)6, K2Bi(PO4)(MoO4)) and KBi(MoO4)2 in the violet-green spectral region are related to radiative transitions in Bi3+ ions. The red PL components of K2Bi(PO4)(MoO4), KBi(MoO4)2 and K5Bi(MoO4)4 have MoO42--related origin. The red PL component of K2Bi(PO4)(WO4) luminescence is presumably related to the molybdenum impurities. The intrinsic PL emission band of K6.5Bi2.5W4P6O34 is probably not related to Bi3+ ions.
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