Synthesis of weakly-agglomerated luminescent CaWO4:Nd3+ particles by modified Pechini method

Ratiometric thermometry using single Er3+-doped CaWO4 phosphors

“…A metal-polymer gel was formed after the addition of ethylene glycol. The gel was calcined at T 1 =600 °C for t 1 =2 h. Then powder was co-dispersed with potassium chloride in a weight ratio 1:1 and this mixture was calcined at T 2 =800 °C for t 2 =1 h. These synthesis conditions were earlier determined to be optimal [45]. Salt was removed from the system by ultrasonic treatment in distilled water.…”

Enhanced photoluminescence of hollow CaWO4 microspheres: the fast fabrication, structural manipulation, and exploration of the growth mechanism

“…As a result, the above results further identify that PL performances are strongly influenced by the reaction conditions, particle sizes, and shapes. 42,67,[72][73][74][75][76][77][78][79] Through these data, the order of wavelength from longer to shorter in the range of 340 to 460 nm is sample 1 (30 min) 4 sample 7 (2 min) 4 sample 9 (15 min) 4 sample 6 (1 min) 4 sample 8 (5 min), and the sequence of PL intensity from higher to lower is the same as the wavelength order. Obviously, sample 1 exhibited the best PL property among these products, including the highest intensity and the longest wavelength, which reliably verified the enhanced PL performance owing to the unique microstructure of hollow CaWO 4 microspheres with open cavities and thin shells.…”