The present disclosure relates to a plurality of host materials comprising a first host material having a compound represented by formula 1, and a second host material having a compound represented by formula 2, and an organic electroluminescent device comprising the same. By comprising a specific combination of compounds of the present disclosure as host materials, it is possible to provide an organic electroluminescent device having long lifetime properties while having an equivalent or improved level of power efficiency compared to conventional organic electroluminescent devices.

Disclosed is an organic light emitting device including a first electrode, a second electrode opposite to the first electrode, and at least one organic layer interposed between the first and second electrodes. The organic layer includes first and second compounds represented by Formulae A and B, respectively: ##STR00001## The organic light emitting device exhibits low driving voltage, high efficiency, and long life. Due to these advantages, the organic light emitting device is useful in a variety of industrial applications, including displays and lighting systems.

Disclosed is an organic light emitting device including a first electrode, a second electrode opposite to the first electrode, and at least one organic layer interposed between the first and second electrodes. The organic layer includes first and second compounds represented by Formulae A and B, respectively: ##STR00001## The organic light emitting device exhibits low driving voltage, high efficiency, and long life. Due to these advantages, the organic light emitting device is useful in a variety of industrial applications, including displays and lighting systems.

Provided herein are methods for inhibiting PCSK9, reducing PCSK9 levels, and for treating or preventing related conditions and disorders, in a subject, which includes administering to a subject an effective amount of a compound which includes derivatized cycloalkyl[b]indoles, e.g., cyclopenta-, cyclohexa- and cyclohepta[b]indoles.

The present disclosure relates in part to compounds capable of emitting delayed fluorescence and uses of these compounds in organic light-emitting diodes.

The present disclosure relates in part to compounds capable of emitting delayed fluorescence and uses of these compounds in organic light-emitting diodes.

Provided are a novel compound capable of improving the luminous efficiency, stability and lifespan of a device, an organic electronic element using the same, and an electronic device thereof.

Provided are a novel compound capable of improving the luminous efficiency, stability and lifespan of a device, an organic electronic element using the same, and an electronic device thereof.

Provided are a nitrogen-containing compound, an organic electroluminescent device and an electronic apparatus. The nitrogen-containing compound has a structure as shown in chemical formula 1; Ar.sub.1 and Ar.sub.2 are the same or different, and each is independently selected from a substituted or unsubstituted C6-C30 aryl, or a substituted or unsubstituted C3-C30 heteroaryl; and R.sub.0 is selected from hydrogen, a C1-C6 alkyl, a substituted or unsubstituted C6-C30 aryl, or a substituted or unsubstituted C3-C30 heteroaryl. The nitrogen-containing compound acts as a hole transporting material or a host material of a luminescent layer and can effectively improve the performance of organic electroluminescent devices.

##STR00001##

Provided are a nitrogen-containing compound, an organic electroluminescent device and an electronic apparatus. The nitrogen-containing compound has a structure as shown in chemical formula 1; Ar.sub.1 and Ar.sub.2 are the same or different, and each is independently selected from a substituted or unsubstituted C6-C30 aryl, or a substituted or unsubstituted C3-C30 heteroaryl; and R.sub.0 is selected from hydrogen, a C1-C6 alkyl, a substituted or unsubstituted C6-C30 aryl, or a substituted or unsubstituted C3-C30 heteroaryl. The nitrogen-containing compound acts as a hole transporting material or a host material of a luminescent layer and can effectively improve the performance of organic electroluminescent devices.

##STR00001##