Patent ID: 8395313

Claim:
An organic light-emitting diode, comprising: a cathode and an anode, and, interposed between said cathode and said anode, a first layer in contact with said cathode, based on a first organic material which is n-doped in a zone of this layer that is in contact with this cathode, a second layer in contact with said anode, based on a second organic material which is p-doped in a zone of this layer that is in contact with this anode, wherein: said first layer comprises an electroluminescent zone which is in contact with the second layer and which is not n-doped; said second layer comprises an electroluminescent zone which is in contact with the first layer and which is not p-doped; said second organic material is different to said first organic material; wherein if the cathode and the anode are made of conductive material (M 1 ) and (M 2 ) respectively, and if the work functions of the material (M 1 ) and of the material (M 2 ) are respectively denoted E M1 and E M2 , if E O1C denotes the electron affinity or energy of the LUMO level and E O1V denotes the ionization potential or energy of the HOMO level of the first organic material, and E O2C denotes the energy of the LUMO level and E O2V denotes the energy of the HOMO level of the second organic material, all these levels being evaluated positively relative to the energy of an electron in a vacuum at infinity, then the conductive material of the cathode, that of the anode, and the first and second organic materials are selected such that: E M1 ≧ E O1C , E M2 ≦E O2V , E O2C <E O1C and E O1V > E O2V and wherein both electroluminescent zones (4;4′) comprises at least one luminescent dopant which is selected so that its LUMO level defined by E DLC and its HOMO level defined by E DLV are such that E DLC > E O1C , E DLV <E O2V and E DLV - E DLC <E O2V −E O1C +0.3 eV, thereby preventing the formation of exciplex in the organic light-emitting diode.