Patent ID: 6693158
Filing Date: 2004-02-17
Classification: C08G,C09K,H01L,Y10S

Abstract:
A polymeric light emitting diode comprising a positive electrode formed on a substrate, an emissive layer formed on the positive electrode, and a negative electrode formed on the emissive layer, wherein the emissive layer comprises an electroluminescent conjugated polymer modified with a high electronegative heterocyclic group having an unit of the following formula (I): in which 0ArI and ArII independently are a divalent aromatic group selected from the group consisting of benzene, naphthalene, anthracene, fluorene, thiophene, furan, pyridine, 2,5-di-aryl-1,3,4-oxadiozole-diyl, 2,5-di-aryl-1,3,4-thiadiazole-diyl, 3,5-di-aryl-4-alkoxyaryl-1,2,4-triazole-diyl and a combination of each other, wherein ArII has one or more substituent selected from the group consisting of C1ËœC20 alkyl, C1ËœC22 alkoxy, phenyl, phenoxy, halogen, perfluoromethyl, cyano, silane, siloxane, and a combination of each other; and ArI contains at least one substituent of â€”RsRh, wherein Rh comprises a heterocyclic moiety of oxidiazole, thiadiazole or triazole or a mixture of each other; and â€”Rs is a divalent group selected from the group consisting of â€”Oâ€”, â€”Sâ€”, â€”ORIIOâ€”, â€”ORIISâ€”, â€”SRIISâ€”, and â€”RIIâ€”, wherein RII is C1ËœC20 alkylene or C6ËœC20 arylene; wherein RII is C10ËœC20 alkylene or C6ËœC20 arylene, when y=0 and â€”Rs is â€”ORIIOâ€”.