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Light-emitting diode - Wikipedia
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 … See more
The first LED was created by Soviet inventor Oleg Losev in 1927, but electroluminescence was already known for 20 years, and relied on a diode made of See more
By selection of different semiconductor materials, single-color LEDs can be made that emit light in a narrow band of wavelengths from near-infrared through the visible spectrum and into the ultraviolet range. The required operating voltages of LEDs increase as … See more
There are two primary ways of producing white light-emitting diodes. One is to use individual LEDs that emit three primary colors—red, green and blue—and then mix all the colors to … See more
In an organic light-emitting diode (OLED), the electroluminescent material composing the emissive layer of the diode is an organic compound. The organic material is electrically … See more
• Efficiency: LEDs emit more lumens per watt than incandescent light bulbs. The efficiency of LED lighting fixtures is not affected by shape and size, unlike fluorescent light … See more
In a light-emitting diode, the recombination of electrons and electron holes in a semiconductor produces light (be it infrared, visible or UV), a process called "electroluminescence". … See more
Wikipedia text under CC-BY-SA license LED lamp - Wikipedia
An LED lamp or LED light is an electric light that produces light using light-emitting diodes (LEDs). LED lamps are significantly more energy-efficient than equivalent incandescent lamps and fluorescent lamps. The most efficient commercially available LED lamps have efficiencies exceeding 200 lumens per watt (lm/W) and convert more than half the input power into light. Commercial …
Wikipedia · Text under CC-BY-SA license- Color temperature kelvin: 3000
- lumens/watt: 210
- lumens (mean): 840
- Purchase price: $7.19
History of the LED - Wikipedia
LED display of a TI-30 scientific calculator (c. 1978), which uses plastic lenses to increase the visible digit size X-Ray of a 1970s 8-digit LED calculator display. Until 1968, visible and infrared LEDs were extremely costly, on the order of …
Light-emitting diode physics - Wikipedia
Learn how LEDs produce light by electroluminescence and how the wavelength depends on the semiconductor materials. Find out how the refractive index, optical coatings and die shape …
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LED - Light Emitting Diode: Basics, Types and Characteristics
LED circuit - Wikipedia
Learn about the basic circuit, power source, and current limiting methods for LEDs. Find out how to calculate the resistor value, the forward voltage, and the efficiency of LED drivers.
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OLED - Wikipedia
An organic light-emitting diode (OLED), also known as organic electroluminescent (organic EL) diode, [1] [2] is a type of light-emitting diode (LED) in which the emissive electroluminescent layer is an organic compound film that emits light …
LED | Definition, Light, & Facts | Britannica
Jan 22, 2025 · LED, in electronics, a semiconductor device that emits infrared or visible light when charged with an electric current. LED displays began to be used for consumer electronic devices starting in 1968, when Hewlett-Packard (HP) …
SMD LED - Wikipedia
20 rows · The light from white LED lamps and LED strip lights is usually provided by industry standard surface-mounted device LEDs (SMD LEDs). [2] Non-SMD types of LED lighting also exist, such as COB (chip on board) and MCOB …
LED printer - Wikipedia
An LED printer is a type of computer printer similar to a laser printer. Such a printer uses a light-emitting diode (LED) array as a light source in the printhead instead of the laser used in laser …
Becoming Led Zeppelin - Wikipedia
Becoming Led Zeppelin is a 2025 documentary film directed by Bernard MacMahon which charts the formation and early years of Led Zeppelin. [4] The film is an independent production made …
LED lighting - Wikipedia
This page was last edited on 1 June 2016, at 20:15 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply ...
Shuji Nakamura - Wikipedia
Shuji Nakamura (中村 修二, Nakamura Shūji, born May 22, 1954) is a Japanese-American electronic engineer and inventor of the blue LED, a major breakthrough in lighting technology. …
What is an LED (light-emitting diode)? - gophotonics.com
Mar 7, 2025 · An LED, or light-emitting diode, is a semiconductor device that produces light due to the recombination of electrons with holes when an electric current pass through it. This solid …
LED - Vikipedi
LED yıldız tabanına bağlı yüksek güçlü ışık veren diyotlar (Luxeon, Lumileds) Diğer LED'ler için onlarca mA ile karşılaştırıldığında, yüksek güçlü LED'ler (HP-LED'ler) veya yüksek çıkışlı …
LED - Wikipedia
LED-uri albastre, roșii și verzi; acestea pot fi combinate pentru a produce orice culoare. Un LED (din engleză light-emitting diode, însemnând diodă emițătoare de lumină) este o diodă …
LED – Wikipedia tiếng Việt
LED ngoài trời như đèn giao thông hoặc chiếu sáng công cộng nơi có nhiệt độ quá thấp hoặc quá cao có thể giảm độ sáng hoặc có thể làm hư hỏng LED. LED tăng độ sáng ở nhiệt độ thấp tùy …
LEDs: What Are They? (Definition, Types, and Uses)
Jan 1, 2025 · A LED or light-emitting diode is an electrical component that produces light when current passes through it. LEDs are semiconductor devices, light is produced when the …
Light Emitting Diodes - Engineering LibreTexts
When an LED is forward biased, the bands bend slightly in a way to decrease the energy barrier between the n- and p-type semiconductors. This reduced energy barrier enables more of the …
LED – Wikipedia
LED (engl. light-emitting diode) eli loistediodi [1], valodiodi [2] [a], hohtodiodi tai ledi on puolijohdekomponentti, joka säteilee valoa, kun sen läpi johdetaan sähkövirta. LEDit, kuten …
LED燈 - 维基百科，自由的百科全书
led燈是指利用發光二極管（led）作為光源的燈，一般使用半导体led制成。led灯的寿命和发光效率可达白炽灯的几倍，和一体式荧光灯相比也高出不少 [1] [2] [3] ，其中cree等厂家更是号称能 …
What is an LED? | All About LEDs | Adafruit Learning System
Feb 11, 2013 · This tutorial will cover those wonderful blinky things, LEDs. We're also going to cover how to calculate the current going through an LED and in the mean time introduce two …
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