Luminescence in BaSO₄:Eu

Abstract

Photoluminescence and thermoluminescence in BaSO₄:Eu is reported. In earlier works, divalent Eu has been studied in BaSO₄. In the present work Eu was incorporated as in predominantly Eu³⁺ or Eu²⁺ form. It is shown that RE³⁺ ↔ RE²⁺ conversion or RE²⁺ ↔ RE⁺ conversion is not an integral part of gamma induced TL. Eu³⁺ ↔ Eu²⁺ conversion, on the other hand, may be important in UV induced TL. Low UV efficiency of this material is attributed to poor Eu³⁺ ↔ Eu²⁺ conversion. This is in quite contrast to the analogus material CaSO₄: Eu.

Key Words:

• luminescence
• BaSO₄:Eu
• thermoluminescence
• rare earth impurity
• radio-photoluminescence dosimetry
• recombination
• thermoluminescence dosimetry