fabrication of non-doped red organic light emitting diode using naturally occurring curcumin as a donor-acceptor-donor (d-a-d) emitting layer with very low turn-on voltage

the fabrication of a non-doped red organic light-emitting device (oled) has been developed using naturally occurring curcumin as an emissive layer of oled. in this research, the electroluminescent spectrum (el) of curcumin as a donor-acceptor-donor (d-a-d) chromophore was obtained at wavelength of 612 nm. also, the maximum external quantum efficiencies (eqe) for this device was measured and found to be 0.029 %. the device was characterized by low driving voltage below 1 v at a current density of 7 ma/cm2. high color purity with commission international de l’eclairage coordinates was measured and found to be (0.544, 0.441). quantum mechanical calculations were achieved base on dft/b3lyp/6-311g (d,p) level of theory to rationalize the optical properties, indicating the optimized energy and computing the homo-lumo values. good conformity was observed between theoretical and experimental data.