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Home > Articles > English > LED knowledge > What is LED?

LED knowledge

What is LED?
From: The Site Author: LIGHTUP LED DateTime: 2013-7-1

LED is a light-emitting diode for short, also known as light-emitting diodes

 
Since the development of the semiconductor component is generally used as indicator, display boards, but as technology increases, has been able to use as a light source, it is not only able to efficiently convert electrical energy into light energy directly, and have the most up to tens of thousands of hours ~ 100,000 hours of life, while not as traditional light bulbs with brittle, and can power, also has environmentally friendly mercury, small size, can be used in low-temperature environments, directional light source, resulting in less light pollution and rich color gamut and so on.
 
With the emergence of white LED with more technology import, currently in household appliances and light notebook computers, automotive anti-fog lights, interior lighting, lighting equipment is booming, LED applications are increasingly common.
 
The invention of LED
 
In 1955, the Radio Corporation of America (Radio Corporation of America) for Rubin Braunstein found a gallium arsenide (GaAs) and other semiconductor alloys with infrared radiation effect, and in 1962 the U.S. General Electric Company (GE) is the Nick Holonyak Jr developed visible LEDLED. However, LED really took off in the 1990s white LED appears, gradually began to be heard, and increasingly wide application surface.
 
LED light-emitting principle
 
LED is a way to convert electrical energy into light energy of electronic parts, and also have the characteristics of the diode, which is a negative with a positive, LED most special place is that only emit light from the cathode is energized, it is generally given DC, LED will glow steadily, but if connected to AC power, LED will show a flashing pattern, shiny AC input frequency based on frequency. LED light-emitting principle is applied voltage, so that the electrons and holes in the semiconductor binding, the energy released in the form of light. Currently the global industry to develop different types of LED can be sent from the infrared to blue between the different wavelengths of light, and the industry has purple ~ UV LED, LED recent development is the most attractive in the blue LED coated with fluorescent powder the blue light into white light white LED products. LED light source is known as the new century because of the LED light source and solid-state light sources have the features that save energy, high shock, long life, small size, fast response, and color saturation.
 
LED colors:
 
Because of different materials with the LED manufacturing, has generated the energy of the photons is different, so the industry through the manufacture of materials to control LED light wavelengths and, thus have a variety of different spectral and color LED.
 
The world's first LED material used is arsenic (As), gallium (Ga), operating voltage of 1.424V, which emit light of the infrared spectrum. After the development of the industry of phosphorus (P) of gallium (Ga) As LED material, the working voltage of 2.261V, the emitted light is green. Industry through these two kinds of early type LED materials required for the deployment of a green light from the infrared to all wavelengths within the range of LED products, the development of common red LED, yellow LED, orange light LED, etc., which three categories LED because of the use of gallium, arsenic, phosphorus three elements, it is called 3-element LED, and blue LED, green LED and infrared LED is called a two element LED. Later, the industry developed a hybrid aluminum (Al), calcium (Ca), indium (In) and nitrogen (N) of 4 Elements 4 Elements LED, will be able to issue all the visible range with some of the ultraviolet spectrum of light.
 
LED brightness:
 
In discussing LED products will look at the brightness has three units, namely, the illumination unit lux (Lux), the amount of light units Lumen (Lumen; lm), luminous intensity unit candela (Candle power; CD), 3 kinds of units each of which has suitable field of use, but in value is interconnected.
 
  • CD expressed full radiation of objects, in platinum freezing point temperature sixtieth per square centimeter of luminous intensity. Suitable for use in the field of active light fixtures, such as incandescent bulbs.
  • lm represents 1 CD light irradiation at a distance of 1 cm, an area of ​​1 cm2 plane of light. Suitable for use in reflector lamps and light penetration areas, such as the projector.
  • Lux refers to 1 Lm represents the amount of light is evenly distributed over one square meter area of ​​illumination. Suitable for use in the field of photography.
 
In general, a single LED luminous intensity in CD as a unit, and coupled with perspective parameters, while the LED luminous intensity from everybody ranging from several mCD to 5,000 mCD. Marked LED manufacturers in a single product, its specification is said luminous intensity at 20mA LED current is lit, the best angle and the center position of the point of maximum luminous intensity luminous intensity.
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