Green-Emitting Terbium(III) Complexes With Tunable Optoelectronic Properties Enabled by Functionalized Bipyridine Ligands.

Authors

Sonia Redhu, Devender Singh, Vandana Aggarwal, Anuj Dalal, Rachna Dhankhar, Ajay Kumar, Sumit Kumar, Rajender Singh Malik, Parvin Kumar, Jayant Sindhu

Published in

Luminescence : the journal of biological and chemical luminescence. Volume 41. Issue 11.

Abstract

Four new heteroleptic terbium(III) complexes of general composition [Tb(tfpd)₃N] were synthesized via a facile one pot approach using 4,4,4-trifluoro-1-phenyl-1,3-butanedione (tfpd) as the β-diketonate ligand and substituted 2,2'-bipyridine derivatives as ancillary co-ligands. Elemental (CHN) analysis, along with FT-IR and NMR spectroscopy, confirmed the formation of stable eight-coordinate Tb³⁺ complexes involving O, O- and N, N- donor coordination. The compounds exhibit wide optical band gaps, indicating semiconducting behavior and show good thermal stability, as evidenced by thermogravimetric analysis. Photoluminescence studies reveal Tb³⁺-centered green emission governed by the ⁵D₄ → ⁷F₅ transition at 547 nm. CIE chromaticity coordinates confirm bright green emission for complexes E1-E3, whereas E4 shows a slight blue shift due to ligand centered contributions. The results show that varying ancillary ligands effectively tunes the structural and photophysical properties of Tb(III) complexes, highlighting their potential for optoelectronic and display applications.

PMID:
42971735
Bibliographic data and abstract were imported from PubMed on 03 Nov 2026.

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