How Does Voltage Affect LED Color Through Band Gap Adjustments?

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SUMMARY

The discussion centers on how voltage influences LED color through band gap adjustments. When voltage is applied to an LED, it attracts electrons from the quantum well and repels holes, effectively increasing the band gap and resulting in higher energy emitted light, which corresponds to different colors. Conversely, applying a negative voltage decreases the band gap. Practical applications of this principle in LED technology were sought, highlighting the need for real-life examples.

PREREQUISITES
  • Understanding of LED band diagrams
  • Knowledge of quantum well structures in semiconductors
  • Familiarity with voltage application in electronic circuits
  • Basic principles of light emission and color theory in LEDs
NEXT STEPS
  • Research the impact of voltage on LED color in "Quantum Well LEDs"
  • Explore practical applications of "Voltage-Controlled Color Mixing in LEDs"
  • Study "Band Gap Engineering in Semiconductor Materials"
  • Investigate "Real-world Examples of Tunable LED Technologies"
USEFUL FOR

Electrical engineers, LED designers, researchers in optoelectronics, and anyone interested in the practical applications of voltage in LED technology.

Janusz Bednarski
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Homework Statement
How can one use a quantum well to change the colour of emitted light from an LED without changing the semiconductor material?
Relevant Equations
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Hi!

This question is translated so that's why it might sound a bit weird. I know that the answer should mention the band diagram of the LED, and I think that the answer is to introduce an electrical contact connected to a voltage source. Then when you increase the voltage, it should attract the electrons from the quantum well, and repel the holes from the other well, thus increasing the band gap and increasing the emitted light's energy (different colour). And vice versa for a negative voltage.

Am I correct?

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I am no longer "cutting edge" for LEDs but I am unaware of practical examples of this technology. Does anyone have a real-life example of this idea?
 

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