A report on Light, Infrared and Light-emitting diode
Infrared (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with wavelengths longer than those of visible light.- Infrared
A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it.- Light-emitting diode
Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).- Light
Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared (IR) light.- Light-emitting diode
Emission can be spontaneous, as in light-emitting diodes, gas discharge lamps (such as neon lamps and neon signs, mercury-vapor lamps, etc.) and flames (light from the hot gas itself—so, for example, sodium in a gas flame emits characteristic yellow light).- Light
Remote controls and IrDA devices use infrared light-emitting diodes (LEDs) to emit infrared radiation that may be concentrated by a lens into a beam that the user aims at the detector.- Infrared
2 related topics with Alpha
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
Semiconductor lasers in the blue to near-UV have also been used in place of light-emitting diodes (LEDs) to excite fluorescence as a white light source.
As ideas developed, they abandoned infrared radiation to instead concentrate on visible light.
Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays.
He called them "(de-)oxidizing rays" (de-oxidierende Strahlen) to emphasize chemical reactivity and to distinguish them from "heat rays", discovered the previous year at the other end of the visible spectrum.
UV sources for UV curing applications include UV lamps, UV LEDs, and excimer flash lamps.