Synthesis and characterization of lanthanide based luminescent materials

In this thesis, synthesis and characterization of new lanthanide based luminescent hybrid materials is studied. The thesis consists of two parts. The silica based luminescent hybrid nanomaterials have been prepared and studied in the first part. The different ways for the nanoencapsulation of rare earth complexes in mesoporous silica nanoparticles have been used to prepare highly luminescent nanomaterials. A highly luminescent Eu(Tp)3 complex with limited solubility in organic solvents has been synthesized in situ inside the pores of presynthesized mesoporous silica nanoparticles. The effect of different chemical environment in the silylated mesoporous silica nanoparticles on the luminescence properties of the Eu(III) complex has been studied in detail by encapsulating Eu(dbm)3phen complex in the pores of organically modified mesoporous silica nanoparticles. Furthermore, solid state NMR studies were performed on the Y(dbm)3phen encapsulated mesoporous silica nanoparticles to obtain the structural and dynamic information on these materials. Co-luminescence effect of Tb(III) and Eu(III) complexes has been studied in the mesoporous silica matrix, with the aim of improving luminescence properties of the encapsulated Eu(III) complex. In the second part of this PhD thesis, new anionic tetrakis lanthanide complexes have been synthesized, characterized and their luminescence properties have been studied in detail in the solid state. Furthermore, the luminescent soft materials were prepared by dissolving anionic tetrakis lanthanide complexes in the phosphonium ionic liquids. The phosphonium ionic liquids have been explored as spectroscopic solvents for studying luminescence of new tetrakis lanthanide complexes.