A little technique does not hurt. We’re going to make a point about the LED or Light Emitting Diode in the language of Shakespeare or LED (light-emitting diode) in french but the acronym is the most used. What follows may remind you of technology or electronics courses.
The fact LED part of the semiconductor, it consists of a Millefeuille of layers of materials of different thicknesses. Like all electronic component it is welded on a printed circuit board that leads the current and then covered with a material that allows the passage of light such as silicone. This structure is visible on the LED strips for example.
An LED emits monochromatic light, so that it emit a white light, a so-called phosphor layer is added to expand the spectrum of light emitted.
A LED, how does it work?
By feeding the LED according to its polarity, the semiconductor emits monochromatic light including the color varies depending on the materials used. The emitted wavelength can reach the low wavelength (UV) infrared (850 nm).
The LED emitting a white light are obtained from blue LEDS on which a “phosphor” yellow-orange is affixed to absorbed part of blue emissions and emission wavelengths ranging from green to red. It is the superposition of these different wavelengths that the emitted light is white.
If the first LED bulbs had a rather bluish, since manufacturers have made progress notably with the phosphors more absorbent and a more powerful lighte mission. According to Hetongdiy, current LED bulbs can therefore have warm white, white color of the day or warm white light.
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