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Article Dans Une Revue Journal of Luminescence Année : 2016

Evidence of different red emissions in irradiated germanosilicate materials

Antonino Alessi
Diego Di Francesca
Sylvain Girard
Aziz Boukenter
Youcef Ouerdane

Résumé

This experimental investigation is focused on a radiation induced red emission in Ge doped silica materials, elaborated with different methods and processes. The differently irradiated samples as well as the pristine ones were analyzed with various spectroscopic techniques, such as confocal microscopy luminescence (CML), time resolved luminescence (TRL), photoluminescence excitation (PLE) and electron paramagnetic resonance (EPR). Our data prove that irradiation induces a red luminescence related to the presence of the Ge atoms. Such emission features a photoexcitation spectrum in the UV-blue spectral range and, TRL measurements show that its decrease differs from a single exponential law with a lifetime of tens of nanoseconds. CML measurements under laser at 633 nm evidenced the lack of correlation of the emission here reported with that of the Ge- or Si- non bridging oxygen hole centers. Moreover, our EPR experiments highlighted the lack of correlation between the red emitting defect with other radiation induced paramagnetic centers such as the E′Ge and Ge(2). The relation of the investigated emission with the H(II) defects, previously considered as responsible for a red emission, can not be totally excluded.
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Dates et versions

hal-01528173 , version 1 (27-05-2017)

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Antonino Alessi, Diego Di Francesca, S. Agnello, Sylvain Girard, Marco Cannas, et al.. Evidence of different red emissions in irradiated germanosilicate materials. Journal of Luminescence, 2016, 177, pp.127-132. ⟨10.1016/j.jlumin.2016.04.044⟩. ⟨hal-01528173⟩
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