Provided are compounds of formula Ir(L.sub.A).sub.x(L.sub.B).sub.y(L.sub.C).sub.z wherein the L.sub.A ligand has the Formula I

##STR00001## that are useful as phosphorescent emitters in OLEDs. Also provided are formulations comprising these compounds. Further provided are OLEDs and related consumer products that utilize these compounds.

Provided are compounds of formula Ir(L.sub.A).sub.x(L.sub.B).sub.y(L.sub.C).sub.z wherein the L.sub.A ligand has the Formula I

##STR00001## that are useful as phosphorescent emitters in OLEDs. Also provided are formulations comprising these compounds. Further provided are OLEDs and related consumer products that utilize these compounds.

A compound is represented by Chemical Formula 1.

##STR00001##

In Chemical Formula 1, G, R.sup.1, R.sup.2, R.sup.3, X.sup.1, Ar.sup.1 and Ar.sup.2 are each the same as in the specification.

A compound is represented by Chemical Formula 1.

##STR00001##

In Chemical Formula 1, G, R.sup.1, R.sup.2, R.sup.3, X.sup.1, Ar.sup.1 and Ar.sup.2 are each the same as in the specification.

Organic electroluminescent materials and devices are disclosed. The organic electroluminescent materials are novel benzodithiophene or its analogous structure compounds, which can be used as charge transporting materials, hole injection materials, or the like in an electroluminescent device. These novel compounds can offer excellent performance compared with existing materials, for example, to further improve the voltage, efficiency and/or lifetime of the OLEDs.

Organic electroluminescent materials and devices are disclosed. The organic electroluminescent materials are novel benzodithiophene or its analogous structure compounds, which can be used as charge transporting materials, hole injection materials, or the like in an electroluminescent device. These novel compounds can offer excellent performance compared with existing materials, for example, to further improve the voltage, efficiency and/or lifetime of the OLEDs.

Provided is a stacked organic electroluminescence device. At least one light-emitting unit of the stacked organic electroluminescent device includes an organic layer including a specific combination of a P-type material with a deep LUMO energy level and a hole transporting material with a deep HOMO energy level. Meanwhile, a P-type material is used as the buffer layer of the charge generation layer between the light-emitting units. The device can offer better device performance and more simplified fabrication process. Further provided is a display assembly including the device.

A compound is represented by Formula (1): ##STR00001## wherein, each X is independently oxygen, sulfur, or selenium; m is 0 or 1; each n is independently 0 or 1; R.sup.1-R.sup.3 are each independently, for example, hydrogen or alkyl having 1 to 20 carbons; wherein (i) in the case of m=0, it is excluded that all of R.sup.1-R.sup.3 are hydrogen at the same time; (ii) in the case of m=0, n=0 and in the case that m is 0, one of n is 0 and the other is 1, it is excluded that “both of X are sulfur and all R.sup.3s are the same atoms or groups at the same time”; (iii) in the case of m=0, n=1, it is excluded that all R.sup.3s are the same atoms or groups at the same time, and at least one of R.sup.3s is hydrogen.

A compound is represented by Formula (1): ##STR00001## wherein, each X is independently oxygen, sulfur, or selenium; m is 0 or 1; each n is independently 0 or 1; R.sup.1-R.sup.3 are each independently, for example, hydrogen or alkyl having 1 to 20 carbons; wherein (i) in the case of m=0, it is excluded that all of R.sup.1-R.sup.3 are hydrogen at the same time; (ii) in the case of m=0, n=0 and in the case that m is 0, one of n is 0 and the other is 1, it is excluded that “both of X are sulfur and all R.sup.3s are the same atoms or groups at the same time”; (iii) in the case of m=0, n=1, it is excluded that all R.sup.3s are the same atoms or groups at the same time, and at least one of R.sup.3s is hydrogen.

A compound represented by Chemical Formula 1, and a photoelectric device, an image sensor, and an electronic device including the same are disclosed.

##STR00001##

In Chemical Formula 1, each substituent is the same as defined in the detailed description.