Introduction
Mentioning about lighting, people immediately think of all kinds of varicolored lighting in shops. Although these lamps are of different shapes, but their core part – the bulbs are actually mainly divided into three types: electric incandescent lamp and fluorescent lamp and gas discharge lamp. However, this pattern will be changed in the near future, because a new star in lighting industry - light emitting diode bulb is moving towards practical stage. Light emitting diode was invented in the 60s of the 20th century. In the decades that followed, its fundamental purpose is as indicator light for radio-cassette recorder and other electronic devices. In order to fully tap LED lighting's potential, in recent times, scientists have developed a new type of LED bulbs for lighting, LED air purification light bulb. This bulb has the characteristics of high efficiency and long life; it can continuously serve for 100,000 hours, which is 100 times longer than ordinary incandescent bulb.
It is estimated that globally, LED light bulb has a 9 billion pounds market prospect. In the huge business opportunities attraction, some LED light bulbs wholesale and retail manufacturers such as Philips have begun to invest millions of pounds for research and development of family-use LED bulbs. Scientists predict over the next 5 years, this light bulb is likely to become the mainstream lighting products of the next generation.
As we all know, 100 years up to now since the United States inventor Thomas. Edison invented incandescent lamp, people still continue to use technology invented by Edison to produce incandescent bulbs. The middle of the Light bulb is tungsten wire. When the current passes, the tungsten wire is heated to incandescent state and gives out light.
Luminous Principle
However, the light emitting diode bulbs have essential differences both in structure and in luminous principle from traditional incandescent bulbs. Diodes are elements in common use of electronic circuit, which consist of a semiconductor PN junction, electrode leads and tubes. Diode has two electrodes of PN junction so that it is called diode.
Light emitting diode is usually made from gallium arsenide, gallium phosphide or other semiconductor materials. It glows when it passes forward current. The luminous color depends on the material used, such as red, yellow, green and infrared light. Light emitting diode is often packaged by transparent plastic. Some light emitting diodes have three pins. According to pins' voltage, LED may give out two colors of light.
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