Long lasting phosphorescence properties of Tb-activated reduced calcium aluminate glasses

Abstract

A long lasting green phosphorescence was found in -doped calcium aluminate glasses prepared under a strongly reducing atmosphere. An electron-trapped centre giving an EPR signal at g = 1.999, an analogue of the centre in CaO, was induced by illumination with ultraviolet (uv) radiation and decayed slowly after the illumination was stopped. A partial oxidation of ions to ions by uv illumination was observed. A mechanism of the long lasting phosphorescence was suggested to consist of recombination of an electron released thermally from the -like centre with the photo-oxidized .

Long-lasting phosphorescence in Mn2+:Zn2GeO4crystallites precipitated in transparent GeO2–B2O3–ZnO glass-ceramics

“…CDy 3C [7,8] or glasses prepared under a strong reducing environment [9,10] or were treated under an extreme ambience, e.g. irradiated by an infrared femtosecond laser or under high pressure [11].…”

Growth and magneto-optical properties of NaTb(WO4)2

“…Optical properties of rare-earth ions in crystalline and glassy environments are still the subject of intense studies in recent years; especially Tb 3+ -doped crystal or glass [6][7][8][9]. Tb 3+ ion exhibits a strong paramagnetism due to the transition between 4f 8 -4f 7 5d [10].…”

Europium doped strontium borate glasses and their optical properties

“…Optical properties of rare earth ions in different valences remain to be the subject of intense studies in recent years [1][2][3][4][5], especially in various borate glasses and crystals [6][7][8][9][10][11][12]. These materials are of interest both as phosphors, possible fiber laser materials, and as magnetooptic materials.…”