| abstract |
An organic EL device, including an anode and a cathode, and at least one organic luminescent layer containing a compound of the formula: wherein:X = S, or OR<sub>1</sub>, and R<sub>2</sub> are individually alkyl of from 1 to 20 carbon atoms, aryl or carbocyclic systems;R<sub>3</sub>, and R<sub>4</sub> are individually alkyl of from 1 to 10 carbon atoms, or a branched or unbranched 5 or 6 member substituent ring connecting with R<sub>1</sub>, R<sub>2</sub> respectively; andR<sub>5</sub> and R<sub>6</sub> are individually alkyl of from 1 to 20 carbon atoms, which are branched or unbranched. |