Increasing the intensity of the glow of the phosphor Gd-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Tb(3-7 mol.%), caused by a change in the distribution of the Tb-=SUP=-3+-=/SUP=- activator over the real crystal lattice

Luminophores Gd 2 O S : Tb(3-7 mol.%), obtained through the stage of sol-gel formation 3 Tb precursors with their subsequent sulfidation in sulfur vapor LiF flux at 700 o C, showed high luminescence efficiency. The characterization samples by a set physicochemical methods established that an increase concentration 3+ activator leads to its specific distribution: over gadolinium vacancies (V )''', replacing ions and concentrating it boundaries crystallites. It is noted this case, morphology crystallites changes, short-range order structural unit lattice (Gd ) changes introduction 2- into oxygen [V ] oo or substitution anions, as result which long-range anionic sublattice violated band gap decreases. At concentrations photoluminescence Tb3+ 7 mol.%, radiation quenching does not occur due presence GdOF TbOF phases. Variations these effects lead intensity emission green region 5 D 4 -> F j transitions decrease blue transitions. Keywords: phosphor real structure, distribution, far infrared spectroscopy, Raman XPS spectroscopy.