Patent ID: 8430706

Claim:
A method of manufacturing an organic electroluminescent device having at least two successive light-emitting layers formed between a pair of electrodes, comprising: ink jetting a first composition on a first electrode to form a first light-emitting layer; heating the first composition to form an insoluble layer on at least an upper surface of the first light-emitting layer; ink jetting a second composition on the insoluble layer of the first light-emitting layer to form a second light-emitting layer; and forming a second electrode on the second light-emitting layer, wherein: the insoluble layer is not soluble in a solvent of the second composition the first composition includes the poly(paraphenylenevinylene) precursor of Formula 1 or the poly(9,9-dioctylfluorene) derivative of Formula 4, the poly(paraphenylenevinylene) precursor is conjugated or the poly(9,9-dioctylfluorene) derivative is cross-linked as a result of heating.