Babayevska N. Low-temperature synthesis, structure and luminescent characteristics of complex phosphates Ca10-x-yMexEuy(PO4)6F2 and Y1-x-yGdxEuyPO4, (Me=Pb2+, Mg2+)

Thesis is devoted to obtaining by low-temperature synthesis and study properties of complex micro- and nanophosphates (fluorapatite Ca10-xMex(PO4)6F2 and Y1-x-GdxPO4) doped with Ln (Ln=Eu3+, Sm3+, Ce3+, Tb3+). The effect of activator, modificator and growth conditions (temperature, pH) on the phase composition, morphology and luminescence are studied. With XRD analysis the synthesis conditions of single phase polycrystalline fluorapatite doped with Ln3+ and Y1-x-yGdxLnyPO4 were established. The limits of existence of single Ca10-yEuy(PO4)6F2 and Ca10-x-yMexEuy(PO4)6F2 (Me=Pb2+ and Mg2+) were found. In set of LnPO4 the border of morphotropic conversion from xenotime structure to monazite crystal lattice REE phosphates were found. Incorporation of activator Gd3+ and coactivator Eu3+ in concentration range 0?Gd?1 and 0<Eu?0.02 in optical inert matrix YPO4 allows to obtain effective phosphors with controlled spectral composition and high quantum yield. By low-temperature synthesis with stabilizer PAA (polyacrilic asid) and microemulsion, nanowires and nanoplates of different size of phosphates studied were formed. The influence of morphology on Eu3+ luminescence is studied.