Study On Enhanced Luminescence Of Lanthanide Ions In Zeolite L

Zeolite L crystals feature strictly parallel channels and its morphology and size is tunable,which is a ideal host of luminescent materials. Lanthanide(III) ions have a unique electronic structure and physical and chemical properties. Recently, lanthanide(III) ions doped zeolite L visible and near-infrared luminescent materials have attracted considerable interest. However, lanthanide(III) ions doped zeolite L obtained by means of aqueous ion exchange usually exhibits poor emission intensity. It is therefore highly important to improve the luminescence intensity of lanthanide(III) ions doped zeolite L.Luminescence intensity of lanthanide(III) ions can be improved via ‘‘ship in a bottle method’’ that luminescent lanthanide complexes were inserted into the one-dimensional channels of zeolite L crystals. However, the water molecules in the external of channels are easily quenching to lanthanide luminescence, the reaction need a strict sealed environment. Organic molecules with siloxane groups is large and it can block the pore of zeolite L so that it can protect the metal ions from the quenching of H2 O molecules or OH groups. In this paper, we developed a facile way of preparing luminescent materials with well-defined morphology by simple modification of(Eu3+,Tb3+) doped disc zeolite L crystals with Terpy-Si. Terpy-Si not only sensitize Eu3+ and Tb3+ successfully by ‘antenna effect’ but can protect the metal ions from the quenching of H2 O molecules or OH groups.Luminescence intensity of Yb3+ doped inorganic near-infrared luminescenct materials can be improved by simple annealing at high temperature. However, the luminescence intensity of pure Yb3+ doped materials is weak and their application is limited. Bi3+ is an advanced activator with strong electric-dipole allowed s2�'sp transition. Zeolite as inorganic matrix has excellent mechanical and thermal stability, the rare earth loaded in the pores is uniformly, the preparation process is simple. Zeolite L as inorganic matrix has great superiority than general glass. Herein, we used zeolite L as host to prepare Yb3+、Bi3+ co-doped system. Bi3+ sensitized Yb3+ by simple annealing in the furnace at high temperature which improved the luminescent intensity and lifetimes of Yb3+ doped inorganic near-infrared luminescent materials.