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It was demonstrated, that broadband NIR luminescent bismuth species can be prepared by synproportionation reaction of Bi metal and bismuth ions in usual oxidation state +3. This reaction was observed in highly Lux-Flood oxoacidic borate or phosphate glass melts [1], and Lewis acidic chloroaluminate ionic liquid [2]. The various subvalent Bi species, like univalent cation Bi+ and polycation clusters (Bi5 3+, Bi8 2+etc.) were considered as possible products of synproportionation 2Bi + Bi3+ ↔ 3Bi+ or 4Bi + Bi3+ ↔ Bi5 3+ and candidate NIR luminescent species. The equilibrium shifted toward subvalent species by increasing acidity or/and temperature.
© 2011 Optical Society of America
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