Oxide ancillary ligand‐based europium β‐diketonate complexes and their enhanced luminosity

Abstract

Abstract Ternary materials of europium complex with 2,2,6,6‐tetramethyl‐3,5‐heptanedione (tmhd) ligand and aqua ligand as ancillary ligands have been prepared and characterized for various optoelectronic characteristics. Reactions of hydrated complex [Eu(tmhd) 3 (H 2 O) 2 ] proceeded with triphenylphosphine oxide (TPPO) and pyridine‐N‐oxide (PNO) ancillary ligands were studied to develop novel complexes. The prepared complexes show good thermal stability. A comparative investigation of prepared materials [Eu(tmhd) 3 (H 2 O) 2 ], [Eu(tmhd) 3 (TPPO) 2 ] and [Eu(tmhd) 3 (PNO) 2 ] was conducted for their luminescent behaviors in order to obtain the role of ancillary ligand in the enhancement of illumination amount generated from europium (Eu 3+ ) ion. Color coordinates of prepared ternary complexes such as [Eu(tmhd) 3 (H 2 O) 2 ] with ( x = 0.54, y = 0.32), [Eu(tmhd) 3 (TPPO) 2 ] with ( x = 0.56, y = 0.32) and [Eu(tmhd) 3 (PNO) 2 ] with ( x = 0.57, y = 0.33) indicated that these materials exhibited bright red emission in visible region spectrum. The complexes show a proficient energy transport pathway from the ligands to the innermost Eu 3+ by means of an ancillary ligand‐sensitized luminescence process. Interaction between the metal and ligand results in a distinguished effect on quantum efficiency ( η ) as well as on Judd–Ofelt intensity factor ( Ω 2 ) of the prepared materials.