Synthesis of green emissive Tb (III) complexes for displays: Optical, electrochemical and photoluminescent analysis.

A series of heteroleptic terbium (III) complexes with fluorinated 2-thenoyltrifluoroacetone (TTFA) and other heteroaromatic units have been synthesized. The developed heteroleptic complexes were inspected via elemental study, cyclic voltammetry, thermal analysis and spectroscopic investigations. Optical band-gap data proposed the conducting property of prepared complexes. The photoluminescence emission profiles illustrated peaks based on Tb (III) cation positioned at ~617, 586, 546 and 491 nm, imputed to 5 D 4 to 7 F J (J= 3,4,5,6) transitions separately. Most intense peak at 546 nm corresponding to 5 D 4 → 7 F 5 transition is accountable for the green emissive character of developed complexes. The luminous character of complexes reveals the sensitization of terbium (III) cation by ligands. Color parameters further corroborates the green emanation of Tb 3+ complexes. The photometric characteristics of complexes recommended their usages in designing display devices.