Divalent europium-doped calcium carbonate and oxalate were synthesized by means of co-precipitation, solid state reactions, and thermal decomposition processes under strictly controlled experimental conditions. Preliminary studies of the synthesized phosphor materials showed that CaCO3:Eu2+ and CaC2O4:Eu2+ have similar spectra, e.g. they both have broad band excitations and emissions with peaks at 350 and 450 nm, respectively. Their luminescence properties are excellent to meet the requirement for an optical brightening agent (OBA) which is widely used in, for example, the paper industry. Furthermore, these materials can be made at ambient to 500°C which means a considerable lower cost compared with today’s commercial blue phosphors that need annealing temperatures above 1000°C. Blue luminescent CaCO3:Eu2+ and CaC2O4:Eu2+ are therefore attractive alternatives for today’s OBAs.
|Journal||Journal of Alloys and Compounds|
|Publication status||Published - 2001|
|MoE publication type||A1 Journal article-refereed|
|Event||4th International Conference on f-Elements - Madrid, Spain|
Duration: 17 Sep 2000 → 21 Sep 2000