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Time: 2021-08-13 View: 841
The light-emitting principle of side-emitting patch LED
The terminal voltage of the PN junction constitutes a certain potential barrier. When a forward bias voltage is applied, the potential barrier drops, and the majority carriers in the P and N regions diffuse to each other. Since the mobility of electrons is much greater than that of holes, a large number of electrons will diffuse to the P region, which constitutes the injection of minority carriers in the P region. These electrons recombine with the holes in the valence band, and the energy obtained during the recombination is released in the form of light energy. This is the principle of PN junction light emission.
Features of side-emitting SMD LED
1. Voltage: LED lamp beads use a low-voltage power supply, the power supply voltage is between 2-4V, depending on the product, so it is a safer power supply than using a high-voltage power supply, especially suitable for public places;
2. Current: The brightness becomes brighter with the increase of current. The working current of low-power LED lamp beads is 0-60mA, and the working current of high-power LED is above 150mA.
3. Efficiency: Energy consumption is reduced by 80% compared with incandescent lamps with the same luminous efficiency.
4. Applicability: small, each unit LED chip is 3-5mm square, so it can be prepared into various shapes of devices, and is suitable for changing environments.
5. Stability: 100,000 hours, the light decay is 50% of the initial.
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 red, yellow, green, blue, and orange multicolor light. For example, a red LED at low current can change to orange, yellow, and finally green as the current increases.