A novel compound 2,6-diphenyl-1,5-diaza-1,5-dihydro-s-indacene (Indacene) was synthesized by means of the Madelung reaction starting from 2,5-dimethyl-1,4-phenylenedianiine. The structure was characterised by NMR, IR, MS, and elemental analysis. The UVNis absorption and photoluminescence spectra were investigated. The electroluminescent behaviour of the new compound was studied in ITO/PEDOT-PSS/Indacene-CNPPP/Mg-Ag(10:1)/Ag devices. The electroluminescent maximum was recorded at 504 nm corresponding to a greenish blue emission. The results demonstrate the potential application of Indacene in OLEDs. (C) 2003 Elsevier B.V. All rights reserved.