What is the operating principle of LED?

Related questions

1. Do resistors limit current?
2. What is the voltage required for an LED?
3. What are LEDs used for?
4. Does an anode gain mass?
5. Can RGB LED make warm white?
6. Do you need a resistor for LED headlights?
7. How do I identify an LED?
8. Do resistors save energy?
9. Do LED light strips use a lot of electricity?
10. Can you burn out an LED light?

Tags

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2. #comes
3. #quantum
4. #emits
5. #electron
6. #photon
7. #based
8. #working
9. #emitting
10. #lower
11. #principle
12. #higher
13. #level
14. #diode
15. #energy
16. #light