Novel barbituric acid derivatives for red electroluminescent materiel

Two barbituric acid derivatives have been synthesized and characterized by 1 H-NMR and MS spectra. The photoluminescence (PL) and electroluminescence (EL) properties of these compounds have also been studied. The powder PL intensity of 1, 3-diphenyl-5-(4-dimethylaminobenzenylidene)-2-thiabarbituric acid (Bar-1) and 5-(4-dimethylamino- benzenylidene)-2-barbituric acid (Bar-2) is relative higher and the wavelength shifts to longer wavelength region of spectrum. Thin film of these compounds made by vacuum deposition exhibited good film quality and conductivity. It seems to be hopeful that such high luminescent compounds can be employed as host red light emitting materials in EL devices.