Ionoluminescence studies of combustion synthesized Dy~(3+) doped nano crystalline forsterite

摘要

Ionoluminescence (IL) of nano crystalline Mg_2SiO_4:Dy~(3+) pellet samples bombarded with 100 MeV Si~(+8) ions with fluences in the range (1.124e22.480) × 10~(12) ions cm~(-2) have been studied. Two prominent IL bands with peaks at w480 nm and w580 nm and a weak band with peak at w670 nm are recorded. The characteristic peaks are attributed to luminescence center activated by Dy~(3+) ions due to the transitions ~4F_9/2→~6H_(15/2), ~6H_(13/2) and ~6H_(11/2). It is found that IL intensity initially decreases rapidly and then continuous to decrease slowly with further increase in ion fluence. The reduction in the Ionoluminescence intensity with increase of ion fluence might be attributed to degradation of SieO (2n_3) bonds present on th surface of the sample and/or due to lattice disorder produced by dense electronic excitation unde heavy ion irradiation.