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50 years ago, people have to understand the semiconductor material can produce light of the basic knowledge, the first commercially available diodes in 1960. LED Light is the English light emitting diode (LED) acronym, and its basic structure is an electroluminescent semiconductor material, placed in a wire rack, then surrounded by epoxy sealed, can protect the internal core wire effect, so the seismic performance LED.

The core part of the light-emitting diode is a p-type semiconductor and n-type semiconductor chip formed in the p-type semiconductor and n-type semiconductor between a transition layer, called the pn junction. In certain semiconductor materials, PN junction, the injection of minority carrier and majority carrier recombination, when will the excess energy released in the form of light to convert light energy directly into electrical energy. PN junction reverse voltage, minority-carrier injection is difficult, it is not light. The use of injection electroluminescent diodes called the principle of making light emitting diodes, commonly known as LED. When it is in working condition when a positive (that ends with a positive voltage), current from the LED anode to the cathode, the semiconductor crystals to the making of different colors from the ultraviolet to infrared light, light intensity and current.

Second, LED light bulbs source characteristics

1. Voltage: LED using low voltage power supply, power supply voltage between 6-24V, according to the products vary, so it is more secure than the use of high voltage power supply, especially for public places.

2. Performance: consumption of energy-efficient than incandescent light with 80% reduction

3. Applicability: small, small piece of each unit is LED square 3-5mm, so the shape can be prepared into a variety of devices, and for the environment variable

4. Stability: 10 million hours, the light fades to 50% of the initial

5. Response time: the incandescent millisecond response time, LED lights nanosecond response time

6. Of environmental pollution: no harmful metal mercury

7. Color: you can change the current color, light-emitting diodes by chemical modification methods to easily adjust the material's band structure and band gap, to achieve multi-color light orange red Huanglv Lan. Such as the small current when the red LED bulbs, as the current increases, you can turn to orange, yellow, and finally to the green

8. Price: LED's are expensive, compared to incandescent lamps, a few LED's price to the price of incandescent lamps with a considerable, and often each signal to be 300 to 500 by the diode on the form.