Patent ID: 6893744
Filing Date: 2005-05-17
Classification: H01L,Y10S,Y10T

Abstract:
1. An organic electroluminescent display device comprising: a transparent substrate; an anode formed on the transparent substrate; an organic layer stacked on the anode; a cathode formed on the organic layer; and a buffer layer formed between the cathode and organic layer, the buffer layer including a first material selected from the group consisting of alkaline metals, alkaline earth metals, alkaline metal compounds and alkaline earth metal compounds and a second material wherein the second material is an aromatic amine having the following structural formula: where each of R1, R2, and R3 is selected from the group consisting of hydrogen, alkyl group, substituted or unsubstituted aromatic ring, and substituted or unsubstituted aromatic amine wherein at least one of R1, R2, and R3 is substituted or unsubstituted aromatic ring or substituted or unsubstituted aromatic amine and further, wherein a composition ratio between the first and second materials x and y constituting the buffer layer is x:y=(1˜100):1 or x:y=1:(1˜100) and a total thickness of the buffer layer is 0.1˜10 nm.