Spectral hole-burning was observed in Eu3+ ion-exchanged Na β”-alumina. There were 2 types of persistent hole at different burning wavelengths. One had a complex band shape, and the other had a simple Lorentzian shape. The latter could be burned at up to 70K in a 90%-exchanged sample of Eu3+ ions. This persistent hole was due to a light-induced local structural change around Eu3+ ions, or to light-induced local motions of ions. The barrier height for the light-induced local motion of ions was deduced from an analysis of the thermal-decay profile of the persistent hole, which was determined by means of temperature-cycling. Two potential energies were identified, which were related to the ionic motion of conduction ions through the conduction pass.

Spectral Hole-Burning in Eu3+ Ion Exchanged Na β”-Alumina. T.Hattori, R.Yagi, K.Aso, M.Ishigame: Solid State Ionics, 2000, 136-137, 409-13