LED light-emitting principle

N-type semiconductors with extra electrons, P-type semiconductors with extra "holes", the electrons can be moved between the holes, from one hole to another hole, then the flow of electrons The flow of electrons creates a current, and when a positive current is passed, the electrons combine with the holes in the P-region, and the combination releases energy, which exists in the form of photons.

LED light-emitting diode characteristics

1, high security: LED light beads are generally working voltage is between 2.0-4.0V, so the security is high, even if the electric shock, there is no danger.

2, the use of flexible: due to the small size, so can be used flexibly, made into a variety of volumes, various types of lights.

3, long life: the theoretical life of the LED is 100,000 hours, while the incandescent lamp is only 1,000 hours, energy-saving fluorescent lamps is 8,000 hours.

4, low carbon and environmental protection: does not contain harmful substances, such as mercury and other heavy metals, so it is very environmentally friendly, high luminous efficacy determines its low carbon and energy saving.

5, high luminous efficacy: incandescent light efficiency of about 15lm / W, energy-saving fluorescent lamps for 50-60lm / W, LED 100-120lm / W.

6, high quality of light: no ultraviolet rays in the light, harmless to human health.

Extended information

Luminous efficiency and luminous flux

Luminous efficiency is the ratio of luminous flux to electric power, the unit is generally lm/W. Luminous efficiency represents the energy-saving characteristics of the light source, which is an important indicator of the performance of modern light sources.

Luminous intensity and light intensity distribution

LED luminous intensity is characterized by its luminous intensity in a certain direction, due to the LED in different spatial angle of the light intensity of a lot of difference, and consequently we studied the LED light intensity distribution characteristics. This parameter is of great practical significance, directly affecting the minimum viewing angle of the LED display device.

For example, the stadium LED large color display, if the choice of LED single tube distribution range is very narrow, then the face of the display is at a greater angle of the audience will see the distortion of the image. And traffic sign lights also require a larger range of people can identify.