Luminescent materials of annealed Eu3+-exchanged zeolite L crystals

In this work, we report the luminescence behavior of Eu(3+)-exchanged zeolite L microcrystals annealed at different temperatures. SEM and XRD techniques were employed to characterize the samples. UV-vis absorption spectroscopy and luminescence spectroscopy were used to study the luminescence properties of the annealed materials. It is shown that Eu(3+)-exchanged zeolite L crystals are structurally stable at 800 °C, and that its structure is completely collapsed when annealed at 1100 °C. Calcination of Eu(3+)-exchanged zeolite L crystals at 700 °C leads to a strong violet-blue emission, while a strong red emission is observed when the sample is annealed at 1100 °C.