Influence of P2O5 and Al2O3 content on the structure of erbium-doped borosilicate glasses and on their physical, thermal, optical and luminescence properties

The effect of P2O5 and​/or Al2O3 addn. in Er-​doped borosilicate glasses on the phys., thermal, optical, and luminescence properties is investigated. The changes in these glass properties are related to the glass structure modifications induced by the addn. of P2O5 and​/or Al2O3, which were probed by FTIR, 11B MAS NMR and X-​ray photoelectron spectroscopies. Variations of the polymn. degree of the silicate tetrahedra and modifications in the [3]​B​/[4]​B ratio are explained by a charge compensation mechanism due to the formation of AlO4, PO4 groups and the formation of Al-​O-​P linkages in the glass network. From the absorption and luminescence properties of the Er3+ ions at 980 nm and 1530 nm, declustering is suspected for the highest P2O5 concns. while for the highest Al2O3 concns. no declustering is obsd