earticle

영어

White is the color the human eye realizes when it looks at light containing all the wavelengths of the visible spectrum. In this paper, we propose an LED system to realize the white light by combining multiple LEDs used in emitting spectra of multiple colors to improve color renderings. When a light-emitting diode is switched on, electrons recombine with holes within the device, releasing energy in the form of photons. This effect is called electroluminescence and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor. The color of an LED is determined by the semiconductor material. The proposed system is composed of voltage generator, LED emitter, and LED luminaire. The sensor for detecting the color is well adopted in order to detect the light colors received from the LED emitter, with steady-current controller designed using operational amplifier and transistor. We took advantage of steady-current through the LED emitter in order that several forms of light composed of different wavelengths or frequencies could be adopted producing white color of all frequencies.