Colour tunable emission from Eu0.5Sm0.5(TTA)3 dpphen β-diketonate hybrid organic complex in various organic solvents

We propose the synthesis and charaterization of an orange-red light emitting binuclear Samarium and Europium β-diketonate complex (Sm0.5Eu0.5(TTA)3dpphen) [Sm:Samarium, Eu: Europium, TTA: Thenoyl Trifluoro Acetone, dpphen: bathophenanthroline] by cost effective precipitation technique at pH 7.0, maintaining the stichiometric ratio by mole percentage. The XRD spectrum reveals low crystallinity of the complex and FTIR spectra confirms the structure formation of the complex. Thermogram unveils the thermal stability of the complex as 273.76 °C, while DTA reveals a peak at 507.66 °C, corresponding to the melting point of the complex. UV-Visible absorption spectra of the solvated complex in different basic solvents registers wide band absorption spectra with two sets of peaks, one peaking in the range of 249 - 314 nm and 379-386 nm. PL spectra of the complex in solid state and in solvated state reveal tunable emission from 614 nm to 443 nm when excited at 385 nm. Various photo physical parameters such as absorbance, optical band gap, stokes shift, radiative life time, CIE and CCT were evaluated. These results proved that the synthesized complex have potential as tunable orange-red to blue emissive material for OLED devices, flat panel displays and solid state lighting.