Synthesis of green emissive terbium(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 terbium(III) cation (Tb 3+ ) 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 Tb 3+ 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.