Homogeneous line width in a zinc borate glass activated by Eu3+

In this work we report on the temperature dependence of the homogeneous line width (?h) in 4ZnO · 3B2O3:Eu3+ glass in the region between 30 K and room temperature. The time resolved resonant fluorescence line narrowing technique was applied to the 7F0 <-> 5D0 transition of Eu3+. We obtain that ?h follows the commonly found behaviour T2 in the whole range of temperature (30-300 K). The ?h is comparable to that measured in borate glasses with a small amount of network modifier. This result, together with a linear increase of ?h with the excitation energy within the inhomogeneous profile, is indicative of a specific local environment around the Eu3+ ion in the zinc borate glass.