Abstract:
Disclosed is an improved light-emitting device for an AC power operation. A conventional light emitting device employs an AC light-emitting diode having arrays of light emitting cells connected in reverse parallel. The arrays in the prior art alternately repeat on/off in response to a phase change of an AC power source, resulting in short light emission time during a ½ cycle and the occurrence of a flicker effect. An AC light-emitting device according to the present invention employs a variety of means by which light emission time is prolonged daring a ½ cycle in response to a phase change of an AC power source and a flicker effect can be reduced. For example, the means may be switching blocks respectively connected to nodes between the light emitting cells, switching blocks connected to a plurality of arrays, or a delay phosphor. Further, there is provided an AC light-emitting device, wherein a plurality of arrays having the different numbers of light emitting cells are employed to increase light emission time and to reduce a flicker effect.
Abstract:
A light emitting diode chip including a substrate, a light emitting structure arranged on the substrate, the light emitting structure including an active layer arranged between a first conductive-type semiconductor layer and a second conductive-type semiconductor layer, and a distributed Bragg reflector to reflect light emitted from the light emitting structure. The distributed Bragg reflector has a reflectivity of at least 90% for light of a first wavelength in a blue wavelength range, light of a second wavelength in a green wavelength range, and light of a third wavelength in a red wavelength range, and the distributed Bragg reflector has a reflectivity of at least 90% for light in a full wavelength range of 400 to 700 nm.
Abstract:
The present invention relates to a portable water purification system by means of UV LEDs. Provided according to the present invention is a portable water purification system by means of UV LEDs comprising: a support member; a plurality of LEDs mounted on the surface of the support member; a solid filter provided with a through-path into which the support member is inserted; and a cover, attached to one end of the solid filter, for sealing the through-path of the solid filter.
Abstract:
Disclosed is a UV sterilizer. The UV sterilizer includes a body including a top surface and a sidewall, at least one first UV LED chip disposed on the top surface of the body, and at least one second UV LED chip disposed on the sidewalls of the body. The body is freely movable among various target spaces to be sterilized, whereby the UV sterilizer can perform sterilization in a variety of spaces without being limited to a specific space.
Abstract:
Disclosed are a light emitting diode (LED) package and a method of fabricating the same. The LED package includes a first substrate, a semiconductor stack disposed on a front surface of the first substrate, a second substrate including a first lead electrode and a second lead electrode, a plurality of connectors electrically connecting the semiconductor stack to the first and second lead electrodes, and a wavelength converter covering a rear surface of the first substrate. The semiconductor stack includes a first semiconductor layer, a second semiconductor layer, and an active layer disposed between the first semiconductor layer and the second semiconductor layer.