A thermally activated, sensitized phosphorescence organic electroluminescence device includes a luminescent layer formed of a host material consisting of two materials, one being a hole transport material, and the other an electron transport material, at least one which is a thermally activated delayed fluorescence material. The host material is doped by a phosphorescent dye. The triplet state energy level of the CT excited state of the fluorescence material is higher than the triplet state energy level of the n-π excited state by 0 to 0.3 or the triplet state energy level of the CT excited state of the fluorescence material is higher than the triplet state energy level of the n-π excited state, wherein the difference is above 1.0 eV, and, a difference between the second triplet state energy level of its n-π excited state and the first singlet state energy level of its CT excited state is −0.1 to 0.1 eV.

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.

The present disclosure relates to an OLED display panel. With the OLED display panel, a higher luminous efficiency is achieved by selecting a thermally activated delayed fluorescent material for doping into an organic light emitting layer and applying a compound having a specific energy level to match, thereby the luminous efficiency of an organic photo electronic device is improved.

Organic compounds containing indolocarbazoles as electron donor connected with electron acceptors such aza-triphenylene or dibenzoquinoxaline that can improve the performance of phosphorescent organic light emitting devices are disclosed.

Provided are novel organic molecules containing fused indole and benzimidazole moieties, or their boron containing analogs. Also provided are OLEDs and related consumer products that utilize these compounds containing the fused indole and benzimidazole moieties.

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 a compound of the formula (1), to the use of the compound in an electronic device, and to an electronic device comprising a compound of the formula (1). The present invention furthermore relates to a formulation comprising one or more compounds of the formula (1).

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.

A compound of formula (1)

##STR00001##

wherein X.sub.1 is CR.sub.1 or a nitrogen atom, X.sub.2 is CR.sub.2 or a nitrogen atom, X.sub.3 is CR.sub.3 or a nitrogen atom, X.sub.4 is CR.sub.4 or a nitrogen atom, X.sub.5 is CR.sub.5 or a nitrogen atom, X.sub.6 is CR.sub.6 or a nitrogen atom, X.sub.7 is CR.sub.7, a nitrogen atom, or a carbon atom single-bonded to X.sub.8, X.sub.8 is CR.sub.8, a nitrogen atom, or a carbon atom single-bonded to X.sub.7, X.sub.9 is CR.sub.9 or a nitrogen atom, X.sub.10 is CR.sub.10 or a nitrogen atom, X.sub.11 is CR.sub.11 or a nitrogen atom, X.sub.12 is CR.sub.12 or a nitrogen atom, and Q is CR.sub.Q or a nitrogen atom, and Y is NR.sub.Y1, an oxygen atom, a sulfur atom, C(R.sub.Y2)(R.sub.Y3) or Si(R.sub.Y4)(R.sub.Y5), each R being a hydrogen atom or a substituent.

A compound of formula (11) to (13)

##STR00001##

wherein R.sub.1 to R.sub.4 are each independently D.sub.1 of a formula (1-1) etc. or D.sub.2 of a formula (2-1) etc.

##STR00002##

at least one of R.sub.1 to R.sub.4 being D.sub.1, and at least one of R.sub.1 to R.sub.4 being D.sub.2. In (1-1) and (2-1), X.sub.1 is O or S, R.sub.101 to R.sub.110 and R.sub.161 to R.sub.168 are each independently H, a substituent etc. In at least one D.sub.1, at least one of R.sub.101 to R.sub.110 is a group of a formula (110) or (120):

##STR00003##

Z.sub.1 is a C etc., a ring (B) is an aromatic hydrocarbon ring etc., Y.sub.12 to Y.sub.14 are each independently CR.sub.10A etc., Y.sub.21 to Y.sub.24 are each independently CR.sub.20A etc., Z.sub.2 is an aryl group etc., and * is a bonding position.