| 摘要 |
An improved OLED includes an emitter layer disposed between a cathode and an anode where the emitter layer includes a host material and a phosphorescent emitter material. A first hole transport layer is disposed between the emitter layer and the anode and a second hole transport layer is disposed between the first hole transport layer and the anode. The first hole transport layer includes a first hole transport material that is a carbazole type compound and the second hole transport layer includes a second hole transport material that is different from the first hole transport material. The phosphorescent emitter material includes a phosphorescent organometallic compound that is a heteroleptic compound represented by the formula L2MX, LL′MX, LL′L″M, or LMXX′, wherein L, L′, L″, X, and X′ are inequivalent, bidentate ligands and M is a metal that forms octahedral complexes, wherein L, L′, and L″ are monoanionic inequivalent bidentate ligands coordinated to M through an sp2 hybridized carbon and a heteroatom. |
| 主权项 |
1. An organic light emitting device comprising an anode, a cathode and a plurality of organic layers sandwiched between them, the plurality of organic layers comprising:
an emitter layer comprising a host material and a phosphorescent emitter material, the phosphorescent emitter material comprising a phosphorescent organometallic compound that emits phosphorescent radiation from a triplet molecular excited state when a voltage is applied across the first organic layer; a first hole transport layer disposed between the emitter layer and the anode, the first hole transport layer comprising a first hole transport material represented by the following general formula (HTL1)wherein R1, R2, R3, R4, R5, and R6 may be the same or different fluoric atom, chlorine atom, a deuterium atom, a cyano group, a trifluoromethyl group, a nitro group, linear or branched alkyl group (C1-C6), cyclo-alkyl group (C5-C10), linear or branched alkoxy group (C1-C6), cyclo-alkoxy group (C5˜C10), substituted or unsubstituted aromatic hydrocarbon group, substituted or unsubstituted aromatic heterocyclic group, substituted or unsubstituted condensed polycyclic aromatic group,
r1, r4, r5=0, 1, 2, 3, or 4, r2, r3, r6; =0, 1, 2 or 3, n=0 or 1, and Ar1, Ar2, and Ar3 may be the same or different, substituted or unsubstituted aromatic hydrocarbon group, substituted or unsubstituted aromatic heterocyclic group, substituted or unsubstituted condensed polycyclic aromatic group, deuterium substituted aromatic hydrocarbon group, deuterium substituted aromatic heterocyclic group, or deuterium substituted condensed polycyclic aromatic group; and a second hole transport layer disposed between the first hole transport layer and the anode, wherein the second hole transport layer comprising a second hole transport material that is different from the first hole transport material; and wherein the phosphorescent organometallic compound is a heteroleptic compound represented by the formula L2MX, LL′MX, LL′L″M, or LMXX′, wherein L, L′, L″, X, and X′ are inequivalent, bidentate ligands and M is a metal that forms octahedral complexes, wherein L, L′, and L″ are monoanionic inequivalent bidentate ligands coordinated to M through an sp2 hybridized carbon and a heteroatom. |
