Tetraphenylene triarylamine compounds are disclosed, which are novel triarylamine compounds containing tetraphenylene building block. The compounds can be used as charge transporting materials, hole transporting materials, hole injection materials, electron blocking materials, etc., in an electroluminescent device. These novel compounds have good sublimation characters, and can offer more controllable charge transporting performance and good OLED device performance. Also disclosed are an organic electroluminescent device and a formulation.

An objective of the disclosure is to provide an organic light-emitting composite material based on an exciplex, which, when used as a light-emitting layer, can enhance the efficiency of an organic electroluminescent device. The disclosure also relates to an organic light-emitting device comprising the organic light-emitting composite material, and use of the organic light-emitting composite material of the disclosure for an organic electron device.

Novel organic metal complexes containing fused isoquinoline type ligands useful as emitters for near infrared OLED devices are disclosed. Such a compound has a first ligand L.sub.A having the Formula: ##STR00001##

Embodiments of the disclosed subject matter provide an organic light emitting diode (OLED) having an anode, a cathode, an emissive layer disposed between the anode and the cathode, and a hole blocking layer disposed between the emissive and the cathode. The emissive layer may include a phosphorescent dopant, where the phosphorescent dopant has an emission in 0.5% doped PMMA (Poly(methyl methacrylate)) thin film with a peak maximum wavelength that is greater than or equal to 600 nm at room temperature. The energy of a highest occupied molecular orbital (HOMO) of the phosphorescent dopant may be lower than or equal to −5.1 eV, and the energy of the HOMO of the hole blocking layer is at least 0.1 eV lower than the energy of the HOMO of the phosphorescent dopant.

A compound including a first ligand L.sub.A having a structure of Formula I ##STR00001##
is disclosed. The compound is useful a an emitter dopants in OLEDs for enhancing the OLED performance.

An organometallic compound represented by Formula 1, an organic light-emitting device including the organometallic compound, and a diagnostic composition including the organometallic compound:
M(L.sub.1).sub.n1(L.sub.2).sub.n2,  Formula 1 wherein, in Formula 1, M, L.sub.1, L.sub.2, n1, and n2 are each independently the same as described herein.

A compound of Formula I: ##STR00001## wherein ring A is a 5-membered or 6-membered aromatic ring; wherein R.sup.A, R.sup.B, and R.sup.C each independently represent mono to the maximum allowable substitution, or no substitution; wherein Y.sup.1 is absent or present, and when present is selected from the group consisting of a direct bond, O, S, Se, CRR′, NR, SiRR′, and BR; wherein each X.sup.1-X.sup.3 is N or CR; wherein at least one of X.sup.1-X.sup.3 is N; wherein each A.sup.1-A.sup.5 is independently C or N; wherein the maximum number of N atoms that can connect to each other within each ring is two; wherein each R.sup.1, R.sup.2, R.sup.3, and R.sup.4 is independently selected from the group consisting of alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aryl, heteroaryl, and combinations thereof; wherein each R, R′, R.sup.A, R.sup.B, and R.sup.C is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and wherein any two substituents may be joined or fused together to form a ring.

A compound of Formula I: ##STR00001##
wherein Y is O, S, or Se;
wherein each X.sup.1-X.sup.14 is independently C or N;
wherein two consecutive X.sup.1-X.sup.14 in the same ring are not N;
wherein any of X.sup.1-X.sup.14 is C when it forms a direct bond to R.sup.A, R.sup.B, R.sup.C, or R.sup.D;
wherein R.sup.A, R.sup.B, R.sup.C, and R.sup.D each independently represent mono to the maximum allowable substitution, or no substitution;
wherein each R.sup.A, R.sup.B, R.sup.C, and R.sup.D is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
wherein R.sup.D represents mono to the maximum allowable substitution at least one R.sup.D is not hydrogen; and
wherein any two substituents are optionally joined or fused together to form a ring.

Metal-assisted delayed fluorescent emitters employing benzo-imidazo-phenanthridine and analogues for full color displays and lighting applications.

Provided are an organic electroluminescent material and a device thereof. The organic electroluminescent material is a metal complex including a ligand L.sub.a having a structure of Formula 1, and the metal complex can be used as luminescent materials in electroluminescent devices. These new compounds, when used in electroluminescent devices, can show better performance, provide lower device voltage and higher device efficiency, and significantly improve the comprehensive performance of devices. Further provided are an electroluminescent device including the metal complex and a compound composition including the metal complex.