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An LED strip, tape, or ribbon light is a flexible circuit board populated by surface-mount light-emitting diodes (SMD LEDs) and other components that usually comes with an adhesive backing. Traditionally, strip lights had been used solely in accent lighting, backlighting, task lighting, and decorative lighting applications, such as cove lighting .
The feedback mechanism is suppressed to prevent the device to go into a saturated emission mode. At the heterojunction (extrinsic semiconductor layers used as interfaces between two homojunction materials), the guiding principle for optical power is total internal reflection, which guides the power out at the emitting facet of LED via a path that is parallel to the junction.
1962 Nick Holonyak Jr. develops the first practical visible-spectrum (red) light-emitting diode. 1963 Kurt Schmidt invents the first high pressure sodium-vapor lamp. [17] 1972 M. George Craford invents the first yellow light-emitting diode. 1972 Herbert Paul Maruska and Jacques Pankove create the first violet light-emitting diode.
Seven-segment displays may use a liquid-crystal display (LCD), a light-emitting diode (LED) for each segment, an electrochromic display, or other light-generating or -controlling techniques such as cold cathode gas discharge (neon) (), vacuum fluorescent (VFD), incandescent filaments (Numitron), and others.
Outdoor 4 x 3 m large LED screen in Jelgava, Latvia. Eggcrate display 1968 ... 2003 Organic light-emitting diode display (OLED) [13] Sony XEL-1, the world's first ...
The GaAs 0.60 P 0.40 laser diode worked at low temperatures, but the device still functioned as a light-emitting diode at room temperature. [8] The demonstration of red light emission from the diode inspired the article "Light of Hope – or Terror" in Reader's Digest. GaAsP was the material used for the first generation of commercial LEDs that ...
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