Abstract
Persistent spectral hole burning was observed at room temperature in Eu3+-doped Al2O3–SiO2 glass. The glass was obtained by heating in hydrogen gas to reduce some Eu3+ ions to Eu2+ and the spectral hole was burned in the excitation spectrum of the F70→I50 transition of Eu3+. The depth of the hole burned at 200 K was ∼7% of the total excitation intensity and independent of temperature up to 350 K. A possible mechanism for hole burning is the electron transfer between the Eu3+ ions and the Al-related defect centers.
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