Abstract: Provided is a light emitting device. The light emitting device includes a first conductive type semiconductor layer, an active layer on the first conductive type semiconductor layer, a second conductive type semiconductor layer on the active layer, an undoped semiconductor layer disposed on the second conductive type semiconductor layer and comprising a plurality of first holes, and a third conductive type semiconductor layer disposed on the undoped semiconductor layer and comprising a plurality of second holes.

Abstract: Disclosed are a light emitting device and a light emitting device package having the same. The light emitting device includes a first semiconductor layer doped with N type dopants, a first active layer on the first semiconductor layer, a second semiconductor layer doped with P type dopants on the first active layer, a second active layer on the second semiconductor layer, and a third semiconductor layer doped with N type dopants on the second active layer. A thickness of the second semiconductor layer is in a range of about 2000 ?to about 4000 ?, and doping concentration of the P type dopants doped in the second semiconductor layer is in a range of about 1018cm?3 to about 1021cm?3.

Abstract: Provided are a light emitting device, a method for fabricating the light emitting device, a light emitting device package, and a lighting unit. The light emitting device includes a conductive support substrate, a protection layer on the conductive support substrate, the protection layer having an inclined top surface, a light emitting structure layer including a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer between the first conductive type semiconductor layer and the second conductive type semiconductor layer on the conductive support substrate and the protection layer, and an electrode on the light emitting structure layer. A portion of the protection layer is disposed between the conductive support substrate and the light emitting structure layer.

Abstract: Provided are a light emitting device, a method of manufacturing the light emitting device, a light emitting device package, and a lighting system. The light emitting device includes a reflective layer including a first GaN-based semiconductor layer having a first refractive index, a second GaN-based semiconductor layer having a second refractive index less than the first refractive index, and a third GaN-based semiconductor layer having a third refractive index less than the second refractive index and a light emitting structure layer including a first conductive type semiconductor layer, a second conductive type semiconductor layer, and an active layer disposed between the first conductive type semiconductor layer and the second conductive type semiconductor layer on the reflective layer.

Abstract: Provided are a light-emitting device, a light-emitting device package, and a method for fabricating the light-emitting device. The light-emitting device includes a first light-emitting structure; an insulation layer having non-conductivity, in which a current does not flow, on the first light-emitting structure; a second light-emitting structure on the insulation layer; and a common electrode simultaneously and electrically connected to the first light-emitting structure and the second light-emitting structure.

Abstract: A multifunctional connection cord having data and power interfaces for a personal computer and audio interface for an earphone is provided. A multifunctional connection cord of the present invention includes a stem; an audio plug mounted to protrude from one side of the stem for establishing audio signal lines with a multimedia device; a data/power connector mounted near the audio plug to protrude from the stem for establishing data lines and power charge lines with an external device; a USB connector electrically connected to the audio plug and the data/power connector through a cable by means of the stem; and a socket holder mounted on one side of the USB connector and having an audio socket for receiving an audio plug.

Abstract: A light emitting device includes a plurality of clusters spread on a surface of a substrate and a first semiconductor layer provided over the plurality of clusters. The first semiconductor layer may includes air gaps above the plurality of clusters. In addition, light emitting structure may include a first conductive semiconductor layer adjacent to the first semiconductor layer, an active layer on the first conductive semiconductor layer, and a second conductive semiconductor layer on the active layer.

Abstract: A multipurpose accessory having a multipurpose connection mechanism is provided. The multipurpose accessory of the present invention includes a case, a multipurpose connector extruded at one side of the case for electrically connecting a multimedia device to the multipurpose accessory, an audio connector extruded near the multipurpose connector for connecting an audio output of the multimedia device to the multipurpose accessory, a first cord extended at an opposite side of the case and connected to the audio connector, a second cord extended at the opposite side of the case and connected to the audio connector and having a USB connector at a distal end, and a pair of earpieces electrically connected to the first and second cords for outputting audio signals in the form of audible sound waves.

Abstract: A multifunctional connection cord having data and power interfaces for a personal computer and audio interface for an earphone is provided. A multifunctional connection cord of the present invention includes a stem; an audio plug mounted to protrude from one side of the stem for establishing audio signal lines with a multimedia device; a data/power connector mounted near the audio plug to protrude from the stem for establishing data lines and power charge lines with an external device; a USB connector electrically connected to the audio plug and the data/power connector through a cable by means of the stem; and a socket holder mounted on one side of the USB connector and having an audio socket for receiving an audio plug.

Abstract: A multipurpose accessory having a multipurpose connection mechanism is provided. The multipurpose accessory of the present invention includes a case, a multipurpose connector extruded at one side of the case for electrically connecting a multimedia device to the multipurpose accessory, an audio connector extruded near the multipurpose connector for connecting an audio output of the multimedia device to the multipurpose accessory, a first cord extended at an opposite side of the case and connected to the audio connector, a second cord extended at the opposite side of the case and connected to the audio connector and having a USB connector at a distal end, and a pair of earpieces electrically connected to the first and second cords for outputting audio signals in the form of audible sound waves.