Synthesis, structure and luminescent properties of co-precipitated europium and aluminum hydroxides

Abstract

The big relevance is acquired by issues of development of methods of receiving phosphors, and studying influence on their spectral characteristics of features of structure. Red phosphors which part compounds of europium are of particular interest. Ions of europium have such properties as rather big difference of energy between its resonant and the main levels, providing radiation in the visible range; not degeneracy of these levels; the most important transitions are poorly subject to effect of the crystal field; a good possibility of the theoretical description of the processes happening in the materials containing europium ions. Ranges of a luminescence of the system received by continuous joint sedimentation of hydroxides (CDH) of europium and aluminum at a stage of crystallization of amorphous products are measured. The complex research of the CDH system is conducted by methods of the physicochemical analysis: differential and thermal, IK-spectroscopic, X-ray phase, X-ray fluorescent, power dispersive. The dependence of intensity of a luminescence of a system, from synthesis conditions is analyzed: concentration of initial components, structures of firm phases, temperatures, time (after a year of aging).

Synthesis and physico-chemical study of systems of co-precipitated Eu/Me hydroxides

“…Eu/Fe COG systems form a mechanical mixture, aging proceeds according to the scheme: structure ordering, collective recrystallization. SOG systems are referred to as rapidly aging hydroxides [12,13].…”