Compounds that are organic radicals that can have a dual function. The compounds can be fluorescent emitters that emit in the near-IR. The compounds can also facilitate reverse intersystem crossing (RISC) to convert triplet excitons in an OLED to singlet excited states to maximize utilization of generated excitons in the OLED and approach 100% internal quantum efficiency.

The present invention relates to an organic electroluminescent device containing a mixture which comprises an electron-transporting host material and a hole-transporting host material, to a formulation comprising a mixture of the host materials and to a mixture comprising the host materials. The electron-transporting host material corresponds to a compound of the formula (1) from the class of compounds containing two triazine units. The hole-transporting host material corresponds to a compound of the formula (2) from the class of the biscarbazoles or derivatives thereof.

A composition for manufacturing an organic electronic device includes at least three organic functional materials H1, H2, and H3, and at least one organic solvent. The organic functional materials H1 and H2 can form a type II semiconductor heterojunction structure. A LUMO value of the organic functional material H3 is greater than or equal to that of the organic functional materials H1 and H2, and a HOMO value thereof is less than or equal to that of the organic functional materials H1 and H2.

An organic EL display device includes an anode and a cathode and includes a blue organic EL device, a green organic EL device, and a red organic EL device. The blue organic EL device includes a first emitting layer. The green organic EL device includes a second emitting layer. The red organic EL device includes a third emitting layer. The organic EL devices include a fourth emitting layer as a common layer. The fourth emitting layer is in direct contact with each of the emitting layers). The first emitting layer contains a compound represented by a formula (1) and having at least one group represented by a formula (11). The fourth emitting layer contains a second compound represented by a formula (2).

##STR00001##

Provided is an organic light emitting device including a light emitting layer comprising a compound of Chemical Formula 1 and a first organic material layer comprising a compound of Chemical Formula 2:

##STR00001## wherein: Cy1 to Cy5 are each independently one selected from among a substituted or unsubstituted: aromatic hydrocarbon ring, aliphatic hydrocarbon ring, and aromatic hetero ring, or a ring in which two or more rings selected from the above group are fused, one or more of Cy1 to Cy5 are a ring of Chemical Formula 1-A:

##STR00002## one to three of a* to d* are a position fused to or linked to Chemical Formula 1;

##STR00003## L1 to L3 are each independently a direct bond or a substituted or unsubstituted: arylene or divalent heterocyclic group; and Ar1 and Ar2 are each independently a substituted or unsubstituted: aryl or heterocyclic group.

The present invention relates to the preparation of a novel tetradentate platinum (II) complex and an application thereof, belonging to the field of OLED organic electroluminescent materials. The complex of the present invention has the following structural formula, and is used for a phosphorescent doping material having a photon emission effect in a light-emitting layer of an OLED luminescent device. The complex of the present invention has a high fluorescence quantum efficiency, a good heat stability and a low quenching constant, and can be used for the manufacture of a green light OLED device with a high luminous efficiency and low roll-off.

##STR00001##

Disclosed are a heterocyclic compound represented by Formula 1-1 or 1-2,

##STR00001## wherein, in Formulae 1-1 and 1-2, X.sub.1, CY.sub.1 to CY.sub.3, R.sub.1 to R.sub.3, and a1 to a3, are the same as described in the specification. Also disclosed is an organic light-emitting device including the same.

Provided are organometallic compounds. Also provided are formulations comprising these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.

A compound, Ir(L.sub.A).sub.m(L.sub.B).sub.3-m, having a structure of Formula I,

##STR00001##

is provided. In Formula I, each of moiety A and moiety C is independently a 5- or 6-membered ring or a polycyclic fused ring system comprising 5- or 6-membered rings; moiety B is a 5-membered heterocyclic ring; Z.sup.1, Z.sup.2, and Z.sup.3 are C or N; m is 1 or 2; at least one of R.sup.1, R.sup.2, R.sup.3, R.sup.4 has a structure of Formula II,

##STR00002##

or is a 5-membered heterocyclic ring; each of X.sup.1, X.sup.2, X.sup.3, X.sup.4, and X.sup.5 is CR or N; each of R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.A, R.sup.B, R.sup.C, and R is hydrogen or a General Substituent; at least one of R.sup.1a, R.sup.2a, R.sup.3a, R.sup.4a, R.sup.5a is cycloalkyl, alkyl, silyl, germyl, deuterated variants thereof, fluorinated variants thereof, and combinations thereof. Formulations, OLEDs, and consumer products containing the compound are also provided.

An organic electroluminescence device includes: an anode; an emitting layer; and a cathode, the emitting layer containing a first material, a second material and a third material, the first material being a fluorescent material, the second material being a delayed fluorescent material, the third material having a singlet energy larger than a singlet energy of the second material.