Patent ID: 6284394
Filing Date: 2001-09-04
Classification: H01L,Y10S

Abstract:
An organic electroluminescent device comprising a hole injecting electrode, a negative electrode, and at least one organic layer between the electrodes; whereinat least one of said at least one organic layer has a light emitting function;a high resistivity inorganic electron injecting layer is provided between said light emitting layer and said negative electrode,said high resistivity inorganic electron injecting layer comprisinga first component having a work function of up to 4 eV which is oxide of at least one member selected from alkali metal elements, alkaline earth metal elements, and lanthanide elements, anda second component having a work function of 3 to 5 eV which is at least one metal, andsaid high resistivity inorganic electron injecting layer having conduction paths for electron transportation and which is capable of blocking the hole; andan inorganic insulative hole injecting and transporting layer is provided between said light emitting layer and said hole injecting layer,said inorganic insulative hole injecting and transporting layer containing oxide of silicon and/or germanium as its main component, and said main component having an average composition of:(Si.sub.1-x Ge.sub.x)O.sub.ywherein 0.ltoreq.x.ltoreq.1 and 1.7.ltoreq.y.ltoreq.1.99.