Electroluminescent devices including organic eil layer

摘要

An OLED device comprises a cathode, an anode, and has therebetween a light emitting layer (LEL) comprising a phosphorescent emitting compound disposed in a host comprising a mixture of at least one electron transporting co-host which is a benzophenone derivative with a spiro substituent and at least one hole transporting co-host which is a triphenylamine which contains one trivalent nitrogen atom that is bonded only to carbon atoms, at least one of which is a member of an aromatic ring, wherein there is present an electron transporting layer contiguous to the LEL (HBL?) on the cathode side comprising an anthracene or a fluoranthene and wherein there is present an election injecting layer comprising a phenanthroline or a lithium quinolate contiguous to the cathode.

主权项

1. An OLED device comprising a cathode, an anode, and having therebetween a light emitting layer (LEL) comprising a phosphorescent emitting compound disposed in a host comprising a mixture of at least one electron transporting co-host represented by wherein:
m is an integer from 0 to 5;each x is an integer from 0 to 4;y is an integer from 0 to 3;R2 and R3 are independently selected from hydrogen; alkyl of from 1 to 24 carbon atoms, aryl or hetero-atom substituted aryl of from 5 to 20 carbon atoms, halo, or atoms necessary to complete a fused aromatic ring; and at least one hole transporting co-host represented by wherein there is present an electron transporting layer contiguous to the LEL on the cathode side and wherein there is present an electron-injection layer (EIL) containing a heteroaromatic compound contiguous to the cathode; wherein the electron transporting layer comprises an aromatic hydrocarbon material selected from:
an anthracene represented by: wherein
Ar9 and Ar10 independently represent an aryl group;v1, v2, v3, v4, v5, v6, v7, and v8 independently represent hydrogen or a substituent; anda fluoranthene represented by: wherein
each R1 is independently selected from alkyl, aryl, and heteroaryl groups;R2 through R7 are independently selected from H, alkyl, phenyl, cyano and alkoxy groups; andn is an integer selected from 0 to 4; wherein the electron-injection layer comprises a heteroaromatic compound selected from: wherein
each R5 is independently selected from hydrogen, alkyl, aryl groups and at least one of R5 is aryl or substituted aryl; and wherein
M is Li;R8 and R9 are independently selected substituent groups, provided adjacent substituents may combine to form ring groups;h and i are independently integers from 0 to 3; andj is an integer from 1 to 6.