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The reduction of Eu3+ to Eu2+ in air and luminescence properties of Eu2+ activated ZnO–B2O3–P2O5 glasses

“…When the firing time prolongs further, for example 120 min, the transparent glasses become opal glasses and emit red emission of Eu 3+ , indicating that a second phase appears in the glasses. The similar phenomenon of phase separation was also reported by Koudelka that two phases are produced when the melt of 0.50ZnO-0.40B 2 O 3 -0.10P 2 O 5 is cooled naturally in air, one phase is boron rich, and the other is phosphate rich, which were confirmed by Raman spectra [18]. So we hypothesize that the valence of Eu ion in borate glasses and phosphate glasses is 3.…”

Bioactive glasses in the system CaO–B2O3–P2O5: Preparation, structural study and in vitro evaluation

“…For example, alkali and silver borophosphates have been developed for fast ion conductors [19], zinc borophosphates have found applications as solder glasses [20], whereas several borophosphates exhibit high chemical durability [21]. To our knowledge, there is no report on bioactivity of borophosphate glasses.…”

Thermodynamical miscibility in 0.8[xB2O3–(1−x)P2O5]–0.2K2O glasses

“…Alkali and silver borophosphates have been developed for fast ion conducting applications as electrolytes in solid state electrochemical cells [1][2][3] and zinc-calcium borophosphate glasses were studied for applications as low-melting glass solders or glass seals [4][5][6]. Most of the physicochemical studies of borophosphate glasses were carried out by NMR methods [1,[7][8][9][10][11], and Raman and infrared (IR) spectroscopy [2,3,[12][13][14]. There are few reports investigating the thermochemistry of borophosphate glasses by calorimetry.…”