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led light principle

LED is actually light-emitting diodes, presumably we are already very familiar with such products, because it is really everywhere. Next we learn about the principles of LED lights it.

1.LED lamp principle – Introduction

LED, English called Light Emitting Diode, also known as light-emitting diodes. Its basic structure is an electroluminescent semiconductor material, is a solid-state semiconductor devices, it can be directly into electricity into light. Placed in a lead on the shelf, and then sealed with epoxy resin around to play to protect the role of the internal core line, so the seismic performance of the LED.

2.LED lamp principle – Features

LED fluorescent lamp using the latest LED light source technology, digital design, saving up to 70% or more, 12W LED fluorescent light intensity is equivalent to 40W fluorescent tubes, LED lights have the following characteristics:

1) energy saving, long life.

2) applicability, because a single LED small size, can be made into any shape.

3) response time is short, ns (nanosecond) level response time, and ordinary lamps are ms (millisecond) level response time.

4) environmental protection, no harmful metals, waste recycling.

5) Colorful, pure light color, narrow spectral range, and through the three primary colors red, green and blue color mixing into a colorful or white.

3.LED lamp principle

The heart of the LED is a semiconductor chip, one end of the chip attached to a bracket, the other end connected to the power of the cathode, so that the entire chip is epoxy encapsulated. Semiconductor chip consists of two parts, part of the P-type semiconductor, in which the dominant hole; the other end of the N-type semiconductor, the side is mainly electronic. But when these two kinds of semiconductors are connected, they form a P-N junction between them.

When the current through the wire acting on the chip when the electron will be pushed to the P area, in the P area where the electrons with the hole complex, and then will be issued in the form of photon energy, which is the principle of LED light. The wavelength of light, that is, the color of light, is determined by the material that forms the P-N junction.

led light principle


4.LED lamp principle – application

Originally, LED was used as the indicating light source for instrumentation. Later, various light-colored LEDs were widely used in traffic lights and large area displays, and produced good economic and social benefits. Automotive signal light is also an important field of LED light source applications, because the LED fast response, you can let the trailing driver of the vehicle to know the driving conditions as early as possible to reduce the car rear-end accidents. In addition, LED lights in the outdoor red, green and blue full-color display, key chain micro-torches and other fields have been applied.

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