Abstract: The present disclosure relates to a plurality of host materials comprising a first host material comprising a compound represented by formula 1, and a second host material comprising 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 higher luminous efficiency and/or longer lifetime properties as compared with a conventional organic electroluminescent device.

Abstract: The present disclosure relates to a plurality of host materials comprising a first host material comprising a compound represented by formula 1, and a second host material comprising a compound represented by formula 2, and an organic electroluminescent device comprising the same. By comprising a specific combination of compounds as a host material, it is possible to provide an organic electroluminescent device having an improved lifespan property, compared to conventional organic electroluminescent devices.

Abstract: 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.

Abstract: The present disclosure relates to a plurality of host materials and an organic electroluminescent device comprising the same. By comprising the host materials according to the present disclosure, an organic electroluminescent device having a high power efficiency and/or long lifespan can be provided.

Abstract: The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound, an organic electroluminescent device having a low driving voltage and/or a high luminous efficiency and/or a long lifespan can be provided.

Abstract: The present disclosure relates to a plurality of host materials and organic electroluminescent devices comprising the same. The present disclosure may provide a plurality of host materials having a composition favorable to thermal denaturation due to a low deposition temperature, while improving hole properties and electronic properties of HOMO and LUMO, by comprising separate compounds represented by formulas 1 and 2 into a light-emitting layer. By comprising the plurality of host materials of the present disclosure, it is possible to provide an organic electroluminescent device having a lower driving voltage, higher luminous efficiency and/or longer lifetime.

Abstract: The present disclosure relates to an organic electroluminescent compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound of the present disclosure, an organic electroluminescent device having improved driving voltage, luminous efficiency, lifespan characteristic, and/or power efficiency can be provided.

Abstract: The present disclosure relates to a mobile phone prepaid card service system, a clone card storage device thereof, and a service method. The prepaid card service system according to the present disclosure comprises: a prepaid card company server for issuing a mobile phone prepaid card, which can be used for the amount of money added thereto; and a prepaid card wallet application stored in a storage space of a terminal of a user using the mobile phone prepaid card and executed thereon, and storing the mobile phone prepaid card, wherein the mobile phone prepaid card comprises a default card connected to a user account stored in the prepaid card company server, and at least one option card, which is distinct from the default card and has at least one additional function.

Abstract: A remote control apparatus is provided, which includes a communicator configured to perform communication with a display apparatus, a first input including a plurality of direction keys, a second input disposed on an edge of the first input and including a plurality of keys corresponding to the plurality of direction keys, and a processor configured to transmit to the display apparatus a first control command to perform a function corresponding to a first direction and a first unit in response to selection of a first direction key among the plurality of direction keys of the first input, and transmit to the display apparatus a second control command to perform a function corresponding to the first direction and a second unit greater than the first unit in response to selection of a key corresponding to the first direction key among the plurality of keys of the second input.

Abstract: The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. The organic electroluminescent compound of the present disclosure can provide an organic electroluminescent device showing excellence in color purity, solubility, heat stability, driving voltage, current efficiency, and power efficiency, as well as remarkably improved lifespan.

Abstract: A memory card adapter includes a body having a set of contact pins. The set of contact pins include input pins and output pins implemented in a pin-to-pin structure. The input pins connect with pins of an inserted memory card and the output pins connect with an external socket. The body includes a bottom lead adapted to support the main body, and a top lead adapted to be combined with the bottom lead. The body includes a fixing substance adapted to combine with the contact pins. The body includes a conduction plate on a top surface or a bottom surface of the fixing substance, where the conduction plate is connected to at least one of the contact pins.

Abstract: The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. The organic electroluminescent compound of the present disclosure can provide an organic electroluminescent device showing excellence in color purity, solubility, heat stability, driving voltage, current efficiency, and power efficiency, as well as remarkably improved lifespan.

Abstract: A memory card adapter includes a body having a set of contact pins. The set of contact pins include input pins and output pins implemented in a pin-to-pin structure. The input pins connect with pins of an inserted memory card and the output pins connect with an external socket. The body includes a bottom lead adapted to support the main body, and a top lead adapted to be combined with the bottom lead. The body includes a fixing substance adapted to combine with the contact pins. The body includes a conduction plate on a top surface or a bottom surface of the fixing substance, where the conduction plate is connected to at least one of the contact pins.

Abstract: A remote control apparatus is provided, which includes a communicator configured to perform communication with a display apparatus, a first input including a plurality of direction keys, a second input disposed on an edge of the first input and including a plurality of keys corresponding to the plurality of direction keys, and a processor configured to transmit to the display apparatus a first control command to perform a function corresponding to a first direction and a first unit in response to selection of a first direction key among the plurality of direction keys of the first input, and transmit to the display apparatus a second control command to perform a function corresponding to the first direction and a second unit greater than the first unit in response to selection of a key corresponding to the first direction key among the plurality of keys of the second input.

Abstract: A memory card adapter includes a body having a set of contact pins. The set of contact pins include input pins and output pins implemented in a pin-to-pin structure. The input pins connect with pins of an inserted memory card and the output pins connect with an external socket. The body includes a bottom lead adapted to support the main body, and a top lead adapted to be combined with the bottom lead. The body includes a fixing substance adapted to combine with the contact pins. The body includes a conduction plate on a top surface or a bottom surface of the fixing substance, where the conduction plate is connected to at least one of the contact pins.

Abstract: A memory card adapter includes a body having a set of contact pins. The set of contact pins include input pins and output pins implemented in a pin-to-pin structure. The input pins connect with pins of an inserted memory card and the output pins connect with an external socket. The body includes a bottom lead adapted to support the main body, and a top lead adapted to be combined with the bottom lead. The body includes a fixing substance adapted to combine with the contact pins. The body includes a conduction plate on a top surface or a bottom surface of the fixing substance, where the conduction plate is connected to at least one of the contact pins.

Abstract: The present invention relates to a specific combination of a dopant compound and a host compound, and an organic electroluminescent device comprising the same. The organic electroluminescent device according to the present invention, has an advantage of showing a higher luminous efficiency under a driving voltage lower than that of the device comprising conventional luminescent materials.