August 19, 2022
Calculation of colorful light emitted by full-color LED lights
Light-emitting diodes, referred to as LEDs, are composed of a PN junction like ordinary diodes and also have unidirectional conductivity. When a forward voltage is applied to the light-emitting diode, the holes injected from the P region to the N region and the electrons injected from the N region to the P region will be respectively connected with the electrons in the N region and the empty holes in the P region within a few microns of the PN junction. Hole recombination, resulting in spontaneous emission of fluorescence. The energy states of electrons and holes in different semiconductor materials are different. When electrons and holes recombine, the energy released is somewhat different, the more energy released, the shorter the wavelength of the light emitted.
The light-emitting color of the light-emitting diode does not depend on the color of the outer plastic, but is related to the material of the light-emitting semiconductor. Gallium arsenide is one of them, a diode made of a compound of gallium (Ga), arsenic (AS), and phosphorus (P), which emits visible light when electrons and holes recombine. Gallium arsenide phosphide diodes emit red light, gallium phosphide diodes emit green light, and silicon carbide diodes emit yellow light. Commonly used high-power monochromatic light-emitting diodes are most produced in red, green, and blue light, as well as cyan, yellow, and so on.
The light-emitting color of ordinary monochromatic light-emitting diodes is related to the wavelength of light-emitting, and the wavelength of light-emitting depends on the semiconductor material used to manufacture the light-emitting diode. The wavelength of red light-emitting diodes is generally 650~700nm, the wavelength of amber light-emitting diodes is generally 630~650 nm, the wavelength of orange light-emitting diodes is generally about 610~630 nm, the wavelength of yellow light-emitting diodes is generally about 585 nm, and the green light-emitting diodes are generally about 585 nm. The wavelength of the diode is generally 555~570 nm.
The semiconductor materials used in high-brightness monochromatic light-emitting diodes and ultra-high-brightness monochromatic light-emitting diodes are different from ordinary monochromatic light-emitting diodes, so the intensity of light is also different. High-brightness monochromatic light-emitting diodes use materials such as gallium aluminum arsenide (GaAlAs), ultra-high-brightness monochromatic light-emitting diodes use materials such as gallium indium arsenide phosphorous (GaAsInP), and ordinary monochromatic light-emitting diodes use gallium phosphide (GaP) or Gallium Arsenide Phosphide (GaAsP) and other materials.
