Abstract
Highly red luminescent octacoordinated complexes were synthesized by coordination of Eu(III) ion with thenoyltrifluoroacetone (TTA) and heteroaromatic 1,10-phenanthroline derivatives as auxiliary ligands. To examine their photophysical properties, the ternary europium complexes were characterized spectroscopically. The photoluminescence emission spectra of complexes exhibit characteristic peaks of Eu3+ ion attributed to 5D0→7FJ (J = 0–4) transitions in reddish region. Their photoluminescence characteristics clearly specify that ligands have effectively sensitized the trivalent europium ion via antenna effect. Decay time, Judd-Ofelt parameters, transition rates and quantum efficiency were calculated from photoluminescence emission data. Structural and energy transfer parameters were determined from LUMPAC software. Color parameters estimated from photoluminescence spectral data suggest the red luminous behaviour of synthesized complexes. The outcomes ascertain the adaptability of complexes for the fabrication of solid state lighting, OLEDs and flat panel displays when red emission is required for display.
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