Patent ID: 6559473
Filing Date: 2003-05-06
Classification: H01L

Abstract:
An organic light-emitting diode comprising an anode, an organic hetero-pn-junction consisting essentially of two organic light emitting layers, and a cathode layered sequentially in this order, said organic hetero-pn-junction emitting light by an electric current passing through said diode in an electric field applied between said anode and said cathode, characterized in that said organic hetero-pn-j unction is composed of an organic p-type luminescent-semiconductor thin film and an organic n-type luminescent-semiconductor thin film and that one surface of said organic p-type luminescent-semiconductor film is in contact with said anode and another surface of said organic p-type luminescent-semiconductor thin film is in contact with said organic n-type luminescent-semiconductor thin film, and one surface of said organic n-type luminescent-semiconductor thin film is in contact with said cathode and another surface of said organic n-type luminescent-semiconductor film is in contact with said organic p-type luminescent-semiconductor thin film, and wherein the two organic light emitting layers are undoped.