Abstract:
Disclosed are a light emitting device, a light emitting device package, and a lighting system. The light emitting device includes a conductive support member; a reflective layer on the conductive support member; a light emitting structure on the reflective layer including a first conductive semiconductor layer, a second conductive semiconductor layer, and an active layer between the first and second semiconductor layers; and an electrode on the first conductive semiconductor layer, wherein a distance between the active layer and the reflective layer satisfies 2·Φ1+Φ3=N·2π±Δ, (0≦Δ≦π/2) in which the Φ1 represents a phase change value when light vertically traveling passes through the second conductive semiconductor layer, the Φ3 represents a phase change value when the light is reflected by the reflective layer, and the N represents a natural number, and wherein the distance between the reflective layer and the active layer includes a first distance in a first region overlapping with the electrode perpendicularly to the electrode and a second distance in a second region other than the first region, the first distance being different from the second distance.
Abstract:
Disclosed are a light emitting device package and a lighting system. The light emitting device package includes a sub-mount including a cavity, a light emitting device chip provided in the cavity, an electrode electrically connected to the light emitting chip, a reflective layer formed on a surface of the cavity, a dielectric pattern on the reflective layer, and an encapsulant filled in the cavity.
Abstract:
Provided are a light emitting device, a light emitting device package, and a lighting system. The light emitting device includes a light emitting structure 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 and a light extraction pattern in which a period (a) exceeds λ/n (where, λ is a wavelength of light emitted from the active layer, and n is a refractive index of the light emitting structure) on the light emitting structure. The period (a) may be in the range of 5×(λ/n) (a (15×(λ/n). An etching depth (h) of the light extraction pattern may be equal to or greater than λ/n.
Abstract:
A light emitting device That includes a first photonic crystal structure having a reflective layer and non-metal pattern elements on the reflective layer, a second conductive semiconductor layer on both the reflective layer and the non-metal pattern elements, an active layer on the second conductive semiconductor layer, and a first conductive semiconductor layer on the active layer.
Abstract:
The light emitting device, and corresponding method of manufacture, the light emitting device including a second electrode layer; a second conductive type semiconductor layer formed on the second electrode layer; an active layer formed on the second conductive type semiconductor layer; a first conductive type semiconductor layer formed with a first photonic crystal that includes a mask layer and an air gap formed on the active layer; and a first electrode layer formed on the first conductive type semiconductor layer.
Abstract:
A nitride-based light emitting device capable of achieving an enhancement in emission efficiency and an enhancement in reliability is disclosed. The light emitting device includes a semiconductor layer, and a light extracting layer arranged on the semiconductor layer and made of a material having a refractive index equal to or higher than a reflective index of the semiconductor layer.
Abstract:
A light emitting device having a light extraction structure, which is capable of achieving an enhancement in light extraction efficiency and reliability, and a method for manufacturing the same. The light emitting device includes a semiconductor layer having a multi-layered structure including a light emission layer; and a light extraction structure formed on the semiconductor layer in a pattern having unit structures. Further, the wall of each of the unit structures is sloped at an angle of −45° to +45° from a virtual vertical line being parallel to a main light emitting direction of the light emitting device.