light-emitting diode - ορισμός. Τι είναι το light-emitting diode
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Τι (ποιος) είναι light-emitting diode - ορισμός

SEMICONDUCTOR AND SOLID STATE LIGHT SOURCE
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  • Lumileds]])
  • X-Ray of a 1970s 8-digit LED calculator display
  • [[Blue]] LEDs
  • mains voltage]]
  • Illustration of [[Haitz's law]], showing improvement in light output per LED over time, with a logarithmic scale on the vertical axis
  • 210px
  • Parts of a conventional LED. The flat bottom surfaces of the anvil and post embedded inside the epoxy act as anchors, to prevent the conductors from being forcefully pulled out via mechanical strain or vibration.
  • LED costume for stage performers
  • [[Daytime running light]] LEDs of an automobile
  • Close-up of an led with the voltage being increased and decreased to show a detailed view of its operation.
  • Simple LED circuit with resistor for current limiting
  • LED for miners, to increase visibility inside mines
  •  Los Angeles [[Vincent Thomas Bridge]] illuminated with blue LEDs
  • 21 × 86 mm}} display. Center: Close-up of LEDs in ambient light. Bottom: LEDs in their own red light.
  • RGB-SMD-LED
  • RGB LED
  • Red and green LED traffic signals
  • A 1962 Texas Instruments SNX-100 GaAs LED contained in a TO-18 transistor metal case
  • Round]]'s original experiment from 1907.
  • surface mount LED]]s in most common sizes. They can be much smaller than a traditional 5{{nbsp}}mm lamp type LED, shown on the upper left corner.
  • surface mount LED]]
  • 1978}}), which uses plastic lenses to increase the visible digit size
  • LEDs are produced in a variety of shapes and sizes. The color of the plastic lens is often the same as the actual color of light emitted, but not always. For instance, purple plastic is often used for infrared LEDs, and most blue devices have colorless housings. Modern high-power LEDs such as those used for lighting and backlighting are generally found in [[surface-mount technology]] (SMT) packages (not shown).
  • Very small (1.6×1.6×0.35{{nbsp}}mm) red, green, and blue surface mount miniature LED package with gold [[wire bonding]] details.
  • Stokes-shifted]] light emitted by the Ce<sup>3+</sup>:YAG phosphor, which emits at roughly 500–700 nm

light-emitting diode         
¦ noun see LED.
light-emitting diode         
<electronics> (LED) a type of diode that emits light when current passes through it. Depending on the material used the colour can be visible or infrared. LEDs have many uses, visible LEDs are used as indicator lights on all sorts of electronic devices and in moving-message panels, while infrared LEDs are the heart of remote control devices. See also smoke-emitting diode. (1996-01-05)
Toled         
  • bibcode = 1987ApPhL..51..913T }}</ref> commonly used in small molecule OLEDs
  • OLED lighting in a [[shopping mall]] in [[Aachen]], [[Germany]]
  • Samsung AMOLED displays
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  • Light-emitting polymer (LEP) display showing partial failure
  • RGBG]] system of the [[PenTile Matrix Family]]
  • A 3.8{{nbsp}}cm (1.5{{nbsp}}in) OLED display from a Creative [[ZEN V]] media player
  • Schematic of a bilayer OLED: 1. Cathode (−), 2. Emissive Layer, 3. Emission of radiation, 4. Conductive layer, 5. Anode (+)
  • An old OLED display showing wear
  • poly(''p''-phenylene vinylene)]], used in the first PLED<ref name=b/>
  • Sony's Super Top Emission OLED technology enhances the color purity of emitted lights.
  • [[Sony XEL-1]], the world's first OLED TV<ref name="xel1"/> (front)
  • a) Bottom-emitting and b) top-emitting OLED structures; c,d) Schematic diagrams based on bottom-emitting and top-emitting OLEDs with low and high contrast ratio, respectively.
LIGHT-EMITTING DIODE IN WHICH THE EMISSIVE ELECTROLUMINESCENT LAYER IS A FILM OF ORGANIC COMPOUND THAT EMITS LIGHT IN RESPONSE TO AN ELECTRIC CURRENT.
PLED; Polymer light-emitting diode; Oled; Organic light emitting diode; Light emitting polymer; Polymer LED; Organic Electro-Luminescence; SM-OLED; Holes Only OLED; Organic led; OLED display; OLEDs; Organic light emitting diodes; Organic Light Emitting DIODE; O-LED; Organic LCD; SOLED; Organic light-emitting device; TOLED; OLED TV; P-OLED; List of OLED manufacturers; Organic light-emitting diodes; Organic electroluminescence; Plastic LED; Organic LED; Organic Light Emitting Diode; Organic light-emitting diode; Organic light emitting devices; OLED screen; Organic LEDs; POLED; WOLED
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Βικιπαίδεια

Light-emitting diode

A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor. White light is obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device.

Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared (IR) light. Infrared LEDs are used in remote-control circuits, such as those used with a wide variety of consumer electronics. The first visible-light LEDs were of low intensity and limited to red. Early LEDs were often used as indicator lamps, replacing small incandescent bulbs, and in seven-segment displays. Later developments produced LEDs available in visible, ultraviolet (UV), and infrared wavelengths, with high, low, or intermediate light output, for instance white LEDs suitable for room and outdoor area lighting. LEDs have also given rise to new types of displays and sensors, while their high switching rates are useful in advanced communications technology with applications as diverse as aviation lighting, fairy lights, automotive headlamps, advertising, general lighting, traffic signals, camera flashes, lighted wallpaper, horticultural grow lights, and medical devices.

LEDs have many advantages over incandescent light sources, including lower power consumption, longer lifetime, improved physical robustness, smaller size, and faster switching. In exchange for these generally favorable attributes, disadvantages of LEDs include electrical limitations to low voltage and generally to DC (not AC) power, inability to provide steady illumination from a pulsing DC or an AC electrical supply source, and lesser maximum operating temperature and storage temperature. In contrast to LEDs, incandescent lamps can be made to intrinsically run at virtually any supply voltage, can utilize either AC or DC current interchangeably, and will provide steady illumination when powered by AC or pulsing DC even at a frequency as low as 50 Hz. LEDs usually need electronic support components to function, while an incandescent bulb can and usually does operate directly from an unregulated DC or AC power source.

As a transducer of electricity into light, LEDs operate in reverse of photodiodes.

Παραδείγματα από το σώμα κειμένου για light-emitting diode
1. He also replaced all incandescent lights with compact fluorescent or light–emitting diode bulbs –– even on his Christmas tree.
2. The world first Organic Light–Emitting Diode(OLED) TV has a contrast rating of 1,000,000 to 1, which produces amazingly sharp images.
3. Philips of the Netherlands has agreed to buy Agilent‘s 47 per cent stake in Lumileds Lighting, the light–emitting diode maker, for about $'45m.
4. Samsung, the largest maker of memory chips and liquid crystal display (LCD) screens, is likely to bet on developing next–generation magnetic RAM and ferroelectric RAM chips and organic light–emitting diode (OLED) display technology.
5. The bag, aimed at professional women, uses radio frequency identification tags, a tag reader and a light emitting diode (LED) screen to detect whether any pre–determined items are missing from the bag.