Analysis of the working principle of dual color light-emitting diodes 2

3. Luminescence principle: Different colored light-emitting diodes use different luminescent materials, typically red and green LED chips. Red LEDs typically use semiconductor materials such as gallium arsenide (GaAs), while green LEDs typically use materials such as aluminum gallium phosphorus (AlGaP). These different semiconductor materials have different energy gaps, and when carriers recombine, they release photons of different wavelengths, resulting in different colored luminescence effects.diode

4. Control principle: The color switching of dual color light-emitting diodes is achieved by controlling the polarity and magnitude of the voltage. For example, when a positive voltage is applied to a red LED and a negative voltage is applied to a green LED, red light will be emitted; When the voltage is reversed, green light will be emitted. By controlling the applied voltage signal, switching between two colors can be achieved.

Overall, dual color light-emitting diodes achieve different colors of light emission by controlling different light-emitting regions. Their working principle is similar to that of ordinary light-emitting diodes, but their structure and control methods are different, allowing for more diverse lighting effects.diode