No abstract

To enhance the luminous intensity of phosphors containing Tb 3 + , Gd 3 + was used as a sensitizing ion to recombine with Tb 3 + . Gd 3 + and Tb 3 + ions were loaded on the Al 2 O 3 aerogel matrix with nano porous structure via a simple and facile solgel method. After vacuum drying and calcination, Al 2 O 3 : Tb 3 + , Gd 3 + composite aerogel materials were obtained. Al 2 O 3 aerogel matrix has three-dimensional nanostructure and good chemical stability, which can provide stable crystal field and emission site for the rare earth activated ions. The results indicated that the introduction of Gd 3 + can effectively enhance the luminescence intensity of Al 2 O 3 : Tb 3 + at 543 nm under 260 nm UV excitation. The optimal ratio of Gd 3 + and Tb 3 + was determined to be 1: 1. The mechanism of Gd 3 + sensitization to Tb 3 + can be considered as electric multipole resonance transmission. We expected that this work could provide guidance for the development of enhancing the luminous intensity of green phosphors for lamp.

The study of the influence of different substances introduced on the same matrix will provide a good guide for the construction of materials with good properties. A series of transitions/lanthanides metal ions doped or co-doped Al2O3 aerogel materials with three-dimensional nano porous structure were fabricated by a simple and facile modified sol-gel method. The effect of different transitions/lanthanides metal ions on the microstructure, textural properties, and luminescence properties of Al2O3 aerogels were investigated. By co-doping the Al2O3 aerogel matrix with Eu3+ and Tb3+, we fabricated Al2O3 aerogel luminescent materials with tunable color emissions under UV excitation. The characterization results showed that the microscopic morphology of these aerogels induced by transitions/lanthanides metal ions were obviously different. Interestingly, Al2O3-Eu/Tb (III) and Al2O3-Tb/Ce (III) aerogels exhibited a special flower-like structure. It is hoped that our work will offer some efforts for the preparation of functional materials with excellent properties.