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

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The description of Formula 1 is the same as in the specification.

A light-emitting device including an organometallic compound represented by Formula 1, an electronic apparatus including the light-emitting device, and the organometallic compound are provided

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Provided is an organic electroluminescent device. The organic electroluminescent device comprises an anode, a cathode and an organic layer disposed between the anode and the cathode, wherein the organic layer comprises a first organic layer, the first organic layer comprises a first compound and a second compound, the first compound has specific HOMO and/or LUMO energy levels and a structure represented by Formula 1-1, and the second compound has a specific LUMO energy level and a structure represented by Formula 2-1. Compared with the related art, the combination of the first compound and the second compound can significantly improve the performance of the organic electroluminescent device, such as the efficiency of the device. Further provided is an electronic device comprising the organic electroluminescent device.

Provided is an organic light-emitting device including: a first electrode; a second electrode facing the first electrode; and an emission layer between the first electrode and the second electrode and including a host and a phosphorescent dopant, wherein a photoluminescence (PL) spectrum of the emission layer may include a first peak (I.sub.max) having a maximum intensity and a second peak (I.sub.2nd) having a second highest intensity, and a rate of change of an intensity of the second peak of the emission layer may be greater than 0 percent (%) of an intensity of a second peak of a PL spectrum of the phosphorescent dopant.

Provided are transition metal compounds having 1,2,3-triazine. Also provided are formulations comprising these transition metal compounds having 1,2,3-triazine. Further provided are OLEDs and related consumer products that utilize these transition metal compounds having 1,2,3-triazine.

A compound of Formula I,

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is provided. In Formula I, one of Z.sup.1, Z.sup.2, and Z.sup.3 is N and the remainder are C; each of L.sup.1 and L.sup.2 is independently selected from a direct bond and a linking group; at least one of R.sup.1, R.sup.2, R.sup.A, R.sup.B, R.sup.C, R.sup.D, and R.sup.E comprises a group R* having a structure selected form the group consisting of Formula II, -Q(R.sup.3)(R.sup.4).sub.a(R.sup.5).sub.b, Formula III,

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and Formula IV,

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Each R, R′, R″, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.A, R.sup.B, R.sup.C, R.sup.D, R.sup.E, R.sup.F, R.sup.G, and R.sup.H is independently hydrogen or a General Substituent, with the proviso that group R* is not adamantyl. Formulations, OLEDs, and consumer products containing the compound are also provided.

The present invention relates to iridium complexes suitable for use in organic electroluminescent devices, especially as emitters.

A compound for an organic optoelectronic device, a composition for an organic optoelectronic device including the same, an organic optoelectronic device, and a display device, the compound being represented by Chemical Formula 1:

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A compound of Formula I,

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is provided. In Formula I, one of Z.sup.1, Z.sup.2, and Z.sup.3 is N and the remainder are C; each of L.sup.1 and L.sup.2 is independently selected from a direct bond and a linking group; at least one of R.sup.1, R.sup.2, R.sup.A, R.sup.B, R.sup.C, R.sup.D, and R.sup.E comprises a group R* having a structure selected form
the group consisting of Formula II, -Q(R.sup.3)(R.sup.4).sub.a(R.sup.5).sub.b, Formula III,

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and
Formula IV,

##STR00003##

Each R, R′, R″, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.A, R.sup.B, R.sup.C, R.sup.D, R.sup.E, R.sup.F, R.sup.G, and R.sup.H is independently hydrogen or a General Substituent, with the proviso that group R* is not adamantyl. Formulations, OLEDs, and consumer products containing the compound are also provided.

To provide a compound for further improving the capability of an organic EL device, an organic electroluminescent device having a further improved device capability, and an electronic device including the organic electroluminescent device, and to provide a compound represented by the following formula (1) or formula (2) (wherein each symbol in each formula is as defined in the description), an organic electroluminescent device containing the compound, and an electronic device including the organic electroluminescent device.

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