This paper demonstrates the preparation of europium (Eu 3+) doped silica microspheres using the W/O microencapsulation method. The water phase (W phase) solution is composed of partially hydrolyzed tetraethyl orthosilicate and acetylsalicylic acid acting as hydrophilic active agents. The Eu(NO) 3•H 2O was added into the W phase solution before mixing with the oil phase solution. Under a controlled stirring treatment, the W/O emulsion is obtained by dispersing the W phase solution in cyclohexene containing Span60 as the surfactant. 3-aminopropyl-triethoxysilane (APTES) is used as a gelling agent to encapsulate the micelles and Eu 3+ doped silica microspheres with a mean size of around 2 μm can be obtained. The experimental parameters, such as the W/O ratio, stirring condition, the amount of APTES added and the temperature, are modified and their effects on the morphology and homogeneity of the resulting Eu 3+ doped silica microspheres are systematically studied. The Eu 3+ ions are successfully confined inside the silica microcapsules, exhibiting an optimal red emission with a doping concentration of 3 mol%.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry