The light-emitting principle of side-emitting patch led
The terminal voltage of the PN junction constitutes a certain potential barrier. When the forward bias voltage is applied, the potential barrier drops, and the majority carriers of the P region and the N region diffuse to each other. Since the electron mobility is much larger than the hole mobility, a large number of electrons will diffuse into the P region, which constitutes the injection of minority carriers into the P region. These electrons recombine with holes in the valence band, and the energy obtained during recombination is released in the form of light energy. This is the principle of PN junction light emission.
Features of side-emitting patch led
1. Voltage: LED lamp beads use low-voltage power supply, and the power supply voltage is between 2-4V, which varies according to different products, so it is a safer power supply than using high-voltage power supply, especially suitable for public places;
2. Current: The brightness becomes brighter with the increase of the current. The working current of the low-power LED lamp bead is 0-60mA, and the working current of the high-power LED is above 150mA.
3. Efficiency: The energy consumption is 80% less than that of incandescent lamps with the same light efficiency.
4. Applicability: very small, each unit LED chip is 3-5mm square, so it can be prepared into various shapes of devices, and is suitable for variable environments.
5. Stability: 100,000 hours, the light decay is 50% of the initial value.
6. Response time: The response time of the incandescent lamp is milliseconds, and the response time of the side-emitting patch LED is nanoseconds.
7. Environmental pollution: no harmful metal mercury.
8. Color: Changing the current can change the color. The light-emitting diode can easily adjust the energy band structure and band gap of the material through chemical modification methods to achieve multi-color emission of red, yellow, green, blue and orange. For example, an LED that is red at low current can turn orange, yellow, and finally green as the current increases.
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