Examination of the spectroscopic characteristics of bright green emitting, octa coordinated luminescent terbium (III) complexes

Abstract

Mononuclear heteroleptic green emissive Tb(III) complexes were synthesized utilizing 1,3-diketone and N-based bidentate auxiliary ligands. The structural and photoluminescence characteristics were analyzed employing various spectroscopic and analytical techniques. Band gap values obtained from optical and cyclovoltammetric studies were found in good alignment with each other, illustrating their semiconducting behavior and thereby their potential applications in fabrication of photocells and photovoltaic. The photoluminescent spectra of T1 – T4 complexes exhibited distinct peaks at about 491, 547, 583 and 622 nm. The green emission in these complexes can be attributed to the emission peak observed at approximately 547 nm, which arises from the 5D4→7F5 transition. The thermal investigation revealed their high thermal stability, which further indicates their potential utilization in display devices.