Coprecipitation synthesis of α-(La,Yb,Er)2W2O9 tungstate as a novel upconversion phosphor for optical thermometry

Phase-pure α-(La,Yb,Er)2W2O9 upconversion (UC) phosphors were synthesized via room temperature coprecipitation and subsequent calcination at 1073–1273 K. The pH of the coprecipitation system and th...