摘要:
Compounds comprising the formula L1L2MX wherein L1, L2, and X are distinct bidentate ligands that form an octahedral complex on the metal M, wherein M is a metal with an atomic weight greater than 40. Compounds of this formula are sublimated more facilely than octahedral metal complexes where L1, L2, and X are not distinct bidentate ligands. Organic light emitting devices are also described wherein the emissive layer may comprise a host material containing an emissive molecule of formula L1L2MX, which molecule is adapted to luminesce when a voltage is applied across the heterostructure, and the emissive molecule is selected from the group of phosphorescent organometallic complexes, including iridium complexes of the formula L1L2IrX wherein L1, L2, and X are distinct bidentate ligands.
摘要:
Compounds comprising a 2-phenylpyridine ligand further substituted with a heterocyclic group are provided. In particular, the compound comprises a 2-phenylpyridine ligand further substituted with a nitrogen-containing heterocycle. The compounds may be used in organic light emitting devices to provide devices having improved efficiency and lifetime.
摘要:
Phosphorescent materials and devices having high efficiency and stability, narrow spectrum, and improved processibility. In particular, iridium complexes containing acac-derived ligands with branched alkyl substituents with branching at a position further than the α position to the carbonyl group, were found to be suitable for use as emitters in OLED devices.
摘要:
A compound according to a formula I and devices incorporating the same are described. The compound according to the formula I can have the structure: wherein X is Si or Ge; R1 and R2 represent mono, di, tri, tetra, or penta substitutions or no substitution; R3, R4 represent mono, di, tri, or tetra substitutions or no substitution; R1 and R2 are optionally joined to form a ring, which may be further substituted; L is a single bond or comprises an aryl or heteroaryl group having from 5-20 carbon atoms, which is optionally further substituted; and A is an aromatic group. A contains a group selected from the group consisting of indole, carbazole, benzofuran, dibenzofuran, benzothiophene, dibenzothiophene, benzoselenophene, dibenzoselenophene, triphenylene, azacarbazole, azadibenzofuran, azadibenzothiophene, azadibenzoselenophene, azatriphenylene, and combinations thereof, which are optionally further substituted. The device can include the compound according to Formula I in an organic layer.
摘要:
Aluminum chelate complex compounds with two substituted 8-hydroxyquinoline ligand and one dibenzothiophene, dibenzofuran or dibenzoselenophene ligands or aza-analogs of these molecules, attached directly or through an aromatic spacer to the oxygen atom is provided to improve lifetime, operating voltage and efficiency of an OLED. Additional substitution of dibenzothiophene or dibenzofuran ring may also provide charge delocalization, HOMO modification and higher Tg.
摘要:
Organic light-emitting devices having a multi-component organic electroluminescent layer. The organic electroluminescent layer comprises a phosphorescent dopant and a host material that is a mixture of at least three different compounds: a wide band gap host compound, an electron-transporting host compound, and a hole-transporting host compound. Use of such a multi-component organic electroluminescent layer may improve device efficiency and lifetime.
摘要:
Novel heteroleptic iridium carbene complexes are provided. The complexes have lower-than expected sublimation temperatures, which is beneficial for the processing of these materials in solid state applications. Selective substitution of the ligands provides for phosphorescent compounds that are suitable for use in a variety of OLED devices. The carbene complexes can also be used as materials in a hole blocking layer and/or an electron transport layer to improve device performance.
摘要:
Novel phosphorescent heteroleptic iridium complexes with phenylpyridine and dibenzo-containing ligands are provided. Alkyl substitution at specific positions on the ligands gives rise to compounds with improved OLED properties, including saturated green emission.
摘要:
Compounds are provided that comprise a ligand having a 5-substituted 2-phenylquinoline. In particular, the 2-phenylquinoline may be substituted with a bulky alkyl at the 5-position. These compounds may be used in organic light emitting devices, in particular as red emitters in the emissive layer of such devices, to provide devices having improved properties.
摘要:
Phosphorescent materials are provided, where the materials comprise a coordination compound having at least one ligand L3 having Formula (I): wherein A and B are each independently a 5-membered or 6-membered carbocyclic or heterocyclic ring; wherein RA, RB, RC, and RD each represent mono, di, tri, tetra substitutions, or no substitution; wherein Z1, Z2, Z3, Z4, Z5, Z6, Z7, and Z8 are each selected from N or C; wherein at least one of Z1, Z2, Z3, Z4, Z5, Z6, Z7, and Z8 is N; wherein one of Z1, Z2, Z3, and Z4 is C that is bonded to N of A; wherein Z is selected from the group consisting of BR, NR, PR, O, S, Se, C═O, S═O, SO2, CRR′, SiRR′, and GeRR′; wherein R, R′, RA, RB, RC, and RD are described herein; wherein L3 is coordinated to a metal M1; and wherein L3 may be linked with other ligands to comprise a tridentate, tetradentate, pentadentate, or hexadentate ligand. Devices, such as organic light emitting devices, comprising such compounds are also provided.