Red electroluminescence from Ruthenium complexes

Single-layer polymer devices that emit bright red light from dye dispersed in the polymer matrix are fabricated. The active layer consists only of one polymer layer sandwiched between two electrodes—indium–tin oxide and Mg:Ag. Efficient red emission is achieved using Ruthenium complexes doped blend of poly(N-vinylcarbazole) and 2-tert-butyphenyl-5-biphenyl-1,3,4-oxadiazole. The emission peaks of these electroluminescent devices, ranging from 600 to 645 nm, are tuned by the attached chromophore ligands and the doping concentration of the Ruthenium complexes in polymer matrix. The good red emission performance is achieved with the value of (0.65, 0.34) in the Commission Internationale de I'Eclarage chromaticity 1931 coordinates.