Phase dependent optically stimulated luminescence in Cu-doped Sr₄Si₃O₈Cl₄

Phase dependent optically stimulated luminescence (OSL) is studied in Cu-doped Sr₄Si₃O₈Cl₄. The Study shows that samples in which amount of contributing strontium metasilicate phase in Cu-doped Sr₄Si₃O₈Cl₄ is less, show intense OSL while those samples in which strontium metasilicate phase is more show weak OSL. The observed Cu luminescence is also found to be phase dependent. Sample in which Sr₄Si₃O₈Cl₄ phase is dominant, the observed Cu luminescence is around 350 nm whereas an additional longer wavelength band around 450 nm is observed when the strontium metasilicate phase is present in significant amount. The relatively phase pure, Cu-doped Sr₄Si₃O₈Cl₄ shows good OSL properties. The sensitivity of such material is 3.89 times more compared to commercial Al₂O₃:C (Landauer Inc.). High sensitivity, good linearity and reusability, along with low fading make this material as good OSL phosphor and may find applications in OSL based radiation dosimetry. (authors)