The present invention relates to a novel indole-based compound having excellent hole injection and transport capabilities, light-emitting capabilities, and the like, and an organic electroluminescence device which includes the indole-based compound in one or more organic material layers thereof so as to improve characteristics such as light-emitting efficiency, driving voltage, and lifespan.

Arrangements for phosphorescent blue emissive materials, layers, and devices are provided. The arrangements include a host having first a triplet energy level of at least 2.8 eV and an absolute difference of not more than 0.3 eV between the first singlet and triplet energy levels, and an emitter that includes an emissive transition metal complex and a first triplet energy level of at least 2.7 eV.

A condensed cyclic compound and an organic light-emitting device including the same are provided.

An organometallic compound represented by Formula 1:

##STR00001## wherein, M is a transition metal; X.sub.1 is a chemical bond, O, S, N(R′), P(R′), B(R′), C(R′)(R″), or Si(R′)(R″); X.sub.2 to X.sub.4 are each independently C or N; a bond between X.sub.1 or Y.sub.1 and M is a covalent bond; one of a bond between X.sub.2 and M, X.sub.3 and M, and X.sub.4 and M is covalent and the other two are coordinate; Y.sub.1 and Y.sub.3-Y.sub.5 are each independently C or N; ring CY.sub.1 to ring CY.sub.4 are each independently a C.sub.5-C.sub.30 carbocyclic group or a C.sub.1-C.sub.30 heterocyclic group, and at least one of ring CY.sub.1 to ring CY.sub.4 is independently a condensed cyclic group wherein two or more rings are condensed with each other; and T.sub.1, X.sub.51, L.sub.1 to L.sub.4; R.sub.1 to R.sub.4, a1 to a4, b1 to b4, and c1 to c4 are as described herein.

An iridium complex is disclosed. The main auxiliary ligand of the iridium complex molecule is selected from 2-(4,6-bistrifluoromethylpyridine) pyridine, 2-(4,6-bistrifluoromethylpyridine) DMCP, 2-(4,6-bistrifluoromethylpyridine) tetramethypyrazine and 2-(4,6-bistrifluoromethylpyridine) triazine derivatives. Such new iridium complex in the invention not only owns the high luminous efficiency, stable chemical property, easy sublimation purification and other advantages, but also has good device performance. By embellishing the molecular structure of ligand, it could adjust the light intensity and efficiency of complexes within the scope of green light wavelength, which provides the convenience for the design and production of Organic Light Emitting Device and lighting source.

An organometallic compound represented by Formula 1, a light-emitting device including the same, and an electronic apparatus including the light-emitting device are disclosed. In Formula 1, the substituents are as described in more detail in the specification.

##STR00001##

Described herein are molecules for use in organic light emitting diodes. Example molecules comprise at least one acceptor moiety A, at least one donor moiety D, and optionally one or more bridge moieties B. Each moiety A is covalently attached to either the moiety B or the moiety D, each moiety D is covalently attached to either the moiety B or the moiety A, and each moiety B is covalently attached to at least one moiety A and at least one moiety D. Values and preferred values of moieties A, D, and B are defined herein.

An electronic apparatus includes a light-emitting device including an organometallic compound represented by Formula 1:

##STR00001## wherein in Formula 1, CY.sub.1 to CY.sub.3 are each independently a C.sub.3-C.sub.60 carbocyclic group or a C.sub.1-C.sub.60 heterocyclic group, Y.sub.1 to Y.sub.4 are each independently C or N, and A.sub.1 to A.sub.4 are each independently a chemical bond, O, or S.

The present invention relates to a novel indole-based compound having excellent hole injection and transport capabilities, light-emission, and other properties, and to an organic electroluminescent device the luminous efficiency, driving voltage, service life, and other characteristics of which are improved due to containing the compound in one or more organic material layers.

A red light thermally activated delayed fluorescence material, a method for preparing the same, and an organic light emitting diode (OLED) device are provided. The OLED device has a luminescent material layer containing the red light thermally activated delayed fluorescence material. The red light thermally activated delayed fluorescence material has a specific molecular structure. The OLED device has a maximum brightness ranging from 1300 to 1800 cd/m.sup.2 and a maximum current efficiency ranging from 25 to 35 cd/A.