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The nature of the emission center of Eu~(2+) in KCaF_3:Eu~(2+) strongly depends on the preparative condi-tions.Experimental results show that there are two different d→f transition emission bands,and the origin ofthese two emission bands,their interrelationship and the effect of doping concentration on them have been dis-cussed.A Eu~(2+)-Eu~(3+) valency change process has been proposed.
The nature of the emission center of Eu ~ (2+) in KCaF_3: Eu ~ (2+) strongly depends on the preparative condi- tions. Experimental results show that there are two different d → f transition emission bands, and the origin of these two emission bands, their interrelationship and the effect of doping concentration on them have been dis-cussed. A Eu ~ (2 +) - Eu ~ (3+) valency change process has been proposed.