ORGANIC LIGHT EMITTING DEVICE AND MATERIALS FOR USE IN SAME

摘要

The present invention provides an OLED in which an organic thin film emissive layer comprising a single layer or plural layers between a cathode and an anode, wherein the organic thin film layer comprises at least one organic light emitting layer, wherein at least one light emitting layer comprises at least one host material and at least one phosphorescent emitter material, wherein the host material comprises a substituted or unsubstituted hydrocarbon compound having the chemical structure represented by the following formula (I): wherein R2 represents a hydrogen atom, a benzene ring, a condensed aromatic hydrocarbon ring, a dibenzofuran ring or a group represented by Ar3-R3; Ar1 to Ar3 each independently represent a benzene ring, a condensed aromatic hydrocarbon ring or a dibenzofuran ring; R1 and R3 each independently represent a hydrogen atom, a benzene ring, a condensed aromatic hydrocarbon ring, or a dibenzofuran ring; the condensed aromatic hydrocarbon ring represented by R1 to R3 and Ar1 to Ar3 is selected from the group consisting of a naphthalene ring, a chrysene ring, a fluoranthene ring, a triphenylene ring, a phenanthrene ring, a benzophenanthrene ring, a dibenzophenanthrene ring, a benzotriphenylene ring, a benzochrysene ring, and a benzo[b] fluoranthene ring; and R1 to R3, Ar1 to Ar3 and 2,7- disubstituted naphthalene ring each independently may have one or more substituents; with the proviso that when Ar1 and Ar2 each represents a condensed aromatic hydrocarbon constituted by four or more-membered ring, Ar1 and Ar2 are different from each other; wherein when Ar1 and Ar2 each represents a benzene ring, R1 and R2 cannot both be a hydrogen atom or a naphthalene ring at the same time; and when R1 and R2 each represents a hydrogen atom, Ar1 and Ar2 cannot both be a naphthalene ring at the same time or a combination of a naphthalene ring and a benzene ring; and the phosphorescent emitter material comprises a phosphorescent organometallic complex having a substituted chemical structure represented by one of the following partial chemical structures represented by the following formulas: wherein each R is independently selected from the group consisting of H, alkyl, alkenyl, alkynyl, CN, CF3, CnF2n+1, trifluorovinyl, CO2R, C(O)R, NR2, NO2, OR, halo, aryl, heteroaryl, substituted heteroaryl or a heterocyclic group.