Electronic structure and associated properties of europium-activated strontium tetraborate phosphor

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Abstract
Strontium tetraborate phosphor activated by europium has been studied within the framework of a molecular-orbital cluster approach. An energy-level diagram for this phosphor has been obtained showing the relative ordering of the energy levels of defects and impurities with respect to the top of the valence band of the pure material. The optical and thermoluminescence data available for this system have been explained with use of this theoretical energy-level diagram. Factors affecting the valence state of activators have been explored.