Light-emitting diodes (leds) source: zhongshan lighting engineering co. , LTD. , release date: 2020 -
05 views: light-emitting diode LED for short.
By containing gallium (
, p (
, nitrogen (
Compounds such as made.
When the electron and hole composite can radiate visible light, thus it can be used to make leds.
In the circuit and equipment as light, or of text or figures.
Gallium arsenide diode red glow, gallium phosphide diode hair green, yellow light, silicon carbide diode gallium nitride diode hair blue light.
Due to the chemical properties of inorganic light-emitting diodes (leds) and organic light emitting diode OLED and leds.
It is a kind of semiconductor diode, can convert electrical energy to light energy.
Light-emitting diodes (oleds) and the development of common diode LED chip LED chip as the development of the tube is composed of a p-n junction, also has unidirectional conductivity.
When adding forward voltage to light emitting diode, from P area into N the holes and by N area into P area electronic, near the p-n junction several micrometers respectively with the hole recombination of electrons and P N area area, produce the spontaneous emission fluorescence.
Different of electrons and holes in semiconductor materials of different energy states.
When the electrons and holes of composite release how much energy is different, the more energy release, the shorter the wavelength of light.
Commonly used are red, green or yellow light diode.
Light emitting diode reverse breakdown voltage is greater than 5 v.
Positive volt-ampere characteristic curve is very steep, it must be series current limiting resistor to control through the diode current.
Current limiting resistor R type under the available computing: R = (
/ IF the type of E for the power supply voltage, UF positive pressure drop for the LED, IF for the normal work of the LED current.
Light-emitting diodes (leds) core part is composed of p-type and n-type semiconductor semiconductor chips, between the p-type and n-type semiconductor semiconductor has a transition layer, called the PN junction.
In some of the semiconductor PN junction, the minority carrier injection with majority carrier compound will release excess energy in the form of light, so as to directly convert the electric energy to light energy.
PN junction to add reverse voltage, minority carrier injection, so the light.
Principle of the use of injection electroluminescent diode called light-emitting diodes (leds), known as the LED.
When it is in a state of positive work (
The combined with forward voltage on both ends)
, when the current is flowing from the LED anode to cathode, semiconductor crystal gives different colors of light from ultraviolet to infrared, the strength of the light associated with current.
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Engineering lighting service calls: related tags: the LED of the bridge floor lighting surroundings buildings lighting scenic spot lights