Synthesis, structural, thermal and optical studies of rare earth coordinated complex: Tb(Sal)3Phen

Complexes of salicylic acid (Sal) and 1,10-phenanthroline (Phen) were synthesized coordinated with terbium ion (Tb3+) in crystalline phases. The structural characterizations of the lanthanide complex were made using FT-IR, NMR (1H and 13C) and XRD techniques. These measurements confirm the formation of Tb(Sal)3Phen complex structure. The thermal aspects of the complex were examined using DTA and TGA techniques. An enhancement in luminescence intensity of Tb3+ ion bands were observed in Tb(Sal)3Phen complex as compared to TbCl3 crystals on 355 nm laser excitation. Enhancement is reported due to the efficient energy transfer process from Sal to Tb3+ ions. This is also confirmed by the time resolved photoluminescence spectroscopy with increase in lifetime of Tb3+ ions due to encapsulation in Sal/Phen network. Our system in itself can be a deserving candidate for luminescent solar collector material when coupled with solar cells.

► RE coordinated complex of Tb(Sal)3Phen in crystalline phases were synthesized.
► Enhancement in luminescence of Tb3+ was observed in complex on 355 nm excitation.
► Fluorescence enhancement is due to the efficient energy transfer from Sal to Tb3+.
► An observed increase in lifetime of Tb3+ is due to encapsulation in Sal/Phen network.
► The present system is a deserving candidate for LSC when coupled with solar cells.