Abstract
Recently, bright long-lasting phosphorescence has been observed for newly discovered crystals with tridymite and melilite structures. We report the optical properties of the longlasting phosphorescence produced by UV or near infrared excitation in the Eu2+ and Dy3+codoped tridymite and Ce3+ doped melilite crystals. We also propose the mechanisms of the long-lasting phosphorescence in these crystals.
