A Simple Key For led Unveiled
A Simple Key For led Unveiled
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물리학 (전자기학 (회로이론 · 전자 회로 · 논리 회로) · 양자역학 · 물리화학 · 열역학 · 응집물질물리학) · 화학
How Can a Diode Develop Light-weight? Light can be a sort of Electrical power that can be released by an atom. It is created up of numerous smaller particle-like packets which have Electrical power and momentum but no mass. These particles, referred to as photons, tend to be the most elementary models of sunshine.
There's two Main methods of manufacturing white mild-emitting diodes. 1 is to make use of personal LEDs that emit a few Major colors—purple, eco-friendly and blue—after which you can blend all the colors to kind white light. One other is to work with a phosphor product to convert monochromatic light-weight from a blue or UV Triggered broad-spectrum white light-weight, comparable to a fluorescent lamp. The yellow phosphor is cerium-doped YAG crystals suspended while in the package or coated to the LED.
The Electricity band gap from the semiconductor materials governs the Power needed to go electrons and holes throughout the device. It can be defined as the difference in Electricity in between the valence band (where holes are normally existing) as well as the conduction band (in which electrons can move freely).
It isn't identified if any zener diode could exist that emits gentle only in reverse-bias manner. Uniquely, such a LED would perform when related backwards.
Due to the simplicity of manufacturing, the phosphor method is still the preferred system for producing substantial-intensity white LEDs. The design and production of a light resource or gentle fixture using a monochrome emitter with phosphor conversion is easier and cheaper than a complex RGB program, and the vast majority of high-intensity white LEDs presently in the marketplace are made utilizing phosphor light conversion.[citation required]
An additional method utilised to generate experimental white mild LEDs utilized no phosphors in the least and was according to homoepitaxially developed zinc selenide (ZnSe) with a ZnSe substrate that simultaneously emitted blue gentle from its active location and yellow light-weight in the substrate.[forty]
When recent passes by way of an LED, the electrons recombine with holes emitting light in the method. LEDs enable The existing to stream from the ahead way and blocks The existing in the reverse direction.
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라이브 공연장에서 조명으로 애용하고 있다. 더 밝고 전기료가 적게 드는 기존의 장점은 물론이고 덜 뜨겁다는 예상 못한 장점이 부각되면서 공연자들로부터 환영받았다.
In its place, they working experience ‘lumen depreciation’, whereby the brightness with the LED dims bit by bit over time. Contrary to incandescent bulbs, LED “life time” is proven with a prediction of when The sunshine output decreases by 30 %.
Năm 2006, họ giới thiệu sản phẩm mẫu đạt kỷ lục mới cho hiệu suất của LED trắng là 131 lm/W với dòng điện twenty mA. Năm này, công ty Nichia Company giới thiệu LED trắng với Helloệu suất a hundred and fifty lm/W cũng với dòng điện 20 mA.
Electronic RGB addressable LEDs contain their unique "intelligent" control electronics. As well as electric power and floor, these supply connections for information-in, info-out, clock and in leuchtstoffröhre 150cm some cases a strobe sign. These are generally related within a daisy chain, which enables person LEDs in a long LED strip light to be conveniently managed by a microcontroller. Facts sent to the first LED of the chain can control the brightness and coloration of every LED independently of the Other people.
4 kilograms). But LED engineering transformed the industry. Though Liquid crystal display TVs were far thinner and lighter than massive rear-projection sets, they nonetheless utilized cold cathode fluorescent tubes to venture a white mild on to the pixels that make up the display screen. All those insert body weight and thickness towards the TV established. LEDs solved both of those problems.