Abstract
Silica gel was functionalised with chloropropyl groups through the sol-gel process and then a b-diketone was incorporated into the support. Afterwards, Eu3+ ion and its chelates of 1,10-phenantroline (phen) and 2,2'-bipyridine (bpy), red phosphors, were supported on such silica. Luminescence studies of Eu3+ bound to this new material have shown that there is an increase in the intensity of the emission when the ion is isolated by ligands in the silica matrix. The energy transfer from the ligands phen and bpy to Eu3+ ion was observed in the excitation spectra, which present new bands ascribed to the ligands and/or complex. The Eu3+-functionalised silica was characterised by TGA and FTIR. TGA analysis showed that there is a large loss of mass around 300 °C, which is ascribed to the organic part of the material. The FTIR spectra presented the vibration modes for Si-C and -CH2-. The luminescent properties of the ions surrounding the Eu3+ ion were studied. The decay curve displayed a bi-exponential behaviour, indicating that there is more than one site of Eu3+ on the surface of the silica.
Highlights
A light-conversion device consists of two discrete components: an “antenna” and an emitter
Luminescent lanthanide complexes have been used in photonic devices where light is absorbed by the ligand and energy is transferred to the emitting metal ion[2,3,4,5,6]
When the silica gel was functionalised through the sol-gel technique, it was possible to control the amount of chloropropyl groups on the support and, the quantity of the covalently bound “antenna” ligands on the matrix. This improved the light emission through the rare earth ion, which is not possible to attain through the conventional silica treatment
Summary
A light-conversion device consists of two discrete components: an “antenna” (light harvesting ligand) and an emitter. Macrocyclic ligands containing heterobiaryl groups bound to Eu3+ and Tb3+ are among the most frequently studied systems In these complexes, the light is harvested by the heterobiaryl groups, transferred to the rare earth ion and emitted. When the silica gel was functionalised through the sol-gel technique, it was possible to control the amount of chloropropyl groups on the support and, the quantity of the covalently bound “antenna” ligands on the matrix. This improved the light emission through the rare earth ion, which is not possible to attain through the conventional silica treatment
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