| abstract |
Provided is an electroluminescent device comprising an organic layer interposed between an anode and a cathode on a substrate, wherein the organic layer includes an electroluminescent layer containing one or more dopant compound (s), and the dopant compound is a mixture of not less than 80 % by weight and less than 100 % by weight of the cis-form and more than 0 % by weight and not more than 20 % by weight of the trans-form: The electroluminescent device, which includes a mixture of not less than 80 % by weight and less than 100% by weight of a dopant having cis configuration and more than 0 % by weight and not more than 20% by weight of the dopant having transconfiguration, exhibits superior luminous efficiency, good color purity and excellent operation life. |