Improvement of photoluminescence of Cu+ ion in Li2SO4.

The synthesis of the Li(2)SO(4) : Cu phosphor using a wet chemical method is reported here. The XRD technique showed the crystalline nature of the prepared material. The presence of Na and K in the host affected the observed photoluminescence characteristics of Li(2) SO(4) : Cu. Photoluminescent emission spectra of Li(2)SO(4) : Cu phosphor showed a very strong prominet peak at 387 nm in the indigo region due to 3d(9) 4 s(1) ↔ 3d(10) transition of the Cu(+) ion. The increase in peak intensity of the PL spectrum suggests that Cu(+) acts as the luminescence center in the present matrix.