Люминесцентные свойства в видимом и коротковолновом ИК-спектральных диапазонах апатитов Sr-=SUB=-2-=/SUB=-La-=SUB=-8-x-=/SUB=-Tm-=SUB=-x-=/SUB=-(GeO-=SUB=-4-=/SUB=-)-=SUB=-6-=/SUB=-O-=SUB=-2-=/SUB=- (x= 0.1-1.0)

Abstract

The Sr2La8-xTmx(GeO4)6O2 (x = 0.1–1.0) solid solutions with the apatite structure were synthesized by the solid-state method for the first time, the spectral-luminescence properties were studied and the prospects of these compounds as phosphors of the visible and short-wave infrared ranges were demonstrated. The luminescence of germanates Sr2La8-xTmx(GeO4)6O2 under ultraviolet excitation is characterized by high blue color purity and color coordinates close to commercially available phosphors. In addition, it was shown that Sr2La8-xTmx(GeO4)6O2 compounds efficiently convert 808 nm laser radiation into a series of emission lines in the spectral range of 1.3–2.2 µm due to successive 3H4 → 3F4 and 3F4 →3H6 transitions in Tm3+ ions. The Sr2La7.6Tm0.4(GeO4)6O2 germanate with a maximum emission intensity in the short-wave infrared region demonstrates high thermal stability of luminescence in the range of 30–220 °С.