Compounds of General Formula I may harvest electrogenerated excitons via metal-assisted delayed fluorescence (MADF). The compounds have utility in light emitting diodes and light emitting devices.

An organic light emitting diode (OLED) device includes an emissive layer having a first sublayer with a first emitter as a dopant, a second sublayer with a second emitter as a dopant, and a third sublayer with a third emitter as a dopant. The second sublayer is between the first sublayer and the third sublayer. A concentration of the first emitter in the first sublayer exceeds a concentration of the third emitter in the third sublayer, and the concentration of the third emitter in the third sublayer exceeds a concentration of the second emitter in the second sublayer.

Tetradentate platinum and palladium complexes based on biscarbazole and analogues for full color displays and lighting applications.

Metal-assisted delayed fluorescent (MADF) emitters including cyclic tetradentate platinum (II) and palladium (II) complexes employing 8H-pyrido[3′,2′:4,5]-pyrrolo[3,2,1-de]acridine and its analogues. These complexes provide improved color purity and enhanced operational stability and are suitable for luminescent labels, emitters for organic light emitting diodes (OLEDs), and lighting applications.

An organic light-emitting device includes: a first electrode; a second electrode; an organic layer between the first electrode and the second electrode and including an emission layer; and at least one organometallic compound represented by Formula 1. The organic light-emitting device including the organometallic compound may have a low driving voltage, a high luminance, a high efficiency, and a long lifespan: ##STR00001##

Triaryl phosphine ligands, as shown in general formulae Ia and Ib, or a mixture thereof, and a preparation method therefor. The invention addresses the deficiencies of biaryl phosphine ligands invented by Buchwald et al. Also provided are a triaryl phosphine coordinated palladium complex, a system composed of triaryl phosphine ligand and a palladium salt or complex, and a use of the triaryl phosphine coordinated palladium complex in catalysing organic reactions, in particular a use in catalysis of coupling reactions involving (pseudo)halogenated aromatic hydrocarbon as substrate.

A compound comprising a first ligand L.sub.A of Formula I,

##STR00001##

is disclosed. In the structure of Formula I, ring A is a 5-membered or 6-membered carbocyclic or heterocyclic ring, Z.sup.1-Z.sup.4 are each independently C or N; at least two consecutive Z.sup.1-Z.sup.4 are C, and are fused to a structure of Formula II

##STR00002##

or Formula III

##STR00003##

Y.sup.1 and Y.sup.2 are each independently O, S, Se, CRR′, SiRR′, or GeRR′; each R.sup.A, R.sup.B, R.sup.C, R, and R′ is a hydrogen or a substituent; and any two substituents may be joined or fused together to form a ring. In the compound, L.sub.A is complexed to a metal M by the dashed lines in Formula I to form a five-membered chelate ring, and M has an atomic weight greater than 40. Organic light emitting devices and consumer products containing the compounds are also disclosed.

A compound having a first ligand L.sub.A of Formula I ##STR00001##
useful as phosphorescent dopant in OLEDs is disclosed.

An organometallic compound represented by Formula 1, which is explained in the specification, is provided. A light-emitting device is provided, which includes a first electrode, a second electrode facing the first electrode, an interlayer between the first electrode and the second electrode and including an emission layer, and the organometallic compound. An electronic apparatus including the light-emitting device is also provided:

##STR00001##

In one aspect, phosphine compounds comprising three adamantyl moieties (PAd.sub.3) and associated synthetic routes are described herein. Each adamantyl moiety may be the same or different. For example, each adamantyl moiety (Ad) attached to the phosphorus atom can be independently selected from the group consisting of adamantane, diamantane, triamantane and derivatives thereof. Transition metal complexes comprising PAd.sub.3 ligands are also provided for catalytic synthesis including catalytic cross-coupling reactions.