Luminescence of nanocrystalline BaFCl codoped with Eu and Tb.

BaFCl:Eu,Tb nanocrystals were synthesized hot-injection thermolysis of metal chlorodifluoroacetates and their luminescence response characterized between 80 and 430 K. Though unintended, partial reduction of Eu to Eu occurred during the synthesis stage, leading to luminescent nanocrystals coactivated by Eu, Eu, and Tb. Their emission was dominated by Eu, specifically by radiative transitions 4f (P) → 4f (S) and 4f5d (lowest level) → 4f (S).