Optoelectronics | 4. Light Emitting Diodes (LEDs) by Pavan | Learn Smarter
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4. Light Emitting Diodes (LEDs)

Light Emitting Diodes (LEDs) have transformed the fields of lighting and display technology through their energy efficiency, long lifespan, and versatility. The chapter delves into the operational principles of LEDs, different types of LEDs, and their wide-ranging applications in various industries. Technological advancements such as OLEDs and QLEDs emphasize the ongoing evolution of this technology.

Sections

  • 4

    Light Emitting Diodes (Leds)

    Light Emitting Diodes (LEDs) are semiconductor devices that emit light when an electric current passes through them, offering significant advantages over traditional lighting options.

    Learning Practice

  • 4.1

    Introduction To Light Emitting Diodes (Leds)

    Light Emitting Diodes (LEDs) are semiconductor devices that emit light when electrical current flows through them, offering advantages like energy efficiency and long lifespan over traditional bulbs.

    Learning Practice

  • 4.2

    Led Technology And Operation

    This section covers the fundamental principles of how Light Emitting Diodes (LEDs) operate, focusing on their basic structure, electroluminescence process, and emission spectrum.

    Learning Practice

  • 4.2.1

    Basic Structure Of An Led

    The basic structure of an LED includes a p-n junction that facilitates electroluminescence, leading to light emission when current flows.

    Learning Practice

  • 4.2.2

    Led Emission Spectrum

    The LED emission spectrum is determined by the semiconductor materials used in LEDs and their respective band gaps, leading to the emission of various colors of light.

    Learning Practice

  • 4.3

    Types Of Leds

    This section discusses various types of LEDs, including their characteristics and applications across different fields.

    Learning Practice

  • 4.3.1

    Standard Leds

    Standard LEDs are versatile light-emitting devices used mainly for indicator and display applications.

    Learning Practice

  • 4.3.2

    High-Power Leds

    High-power LEDs are designed to emit intense light and are utilized in applications like automotive and street lighting.

    Learning Practice

  • 4.3.3

    Surface Mount Device (Smd) Leds

    SMD LEDs are compact light-emitting diodes mounted directly on circuit boards, widely used in displays and modern lighting.

    Learning Practice

  • 4.3.4

    Organic Leds (Oleds)

    Organic LEDs (OLEDs) are a type of LED made from organic compounds that emit light when current is applied, offering advantages like flexibility and higher contrast.

    Learning Practice

  • 4.3.5

    Quantum Dot Leds (Qleds)

    Quantum Dot LEDs (QLEDs) utilize nanoscale semiconductor particles to enhance color output, providing vibrant displays for televisions and monitors.

    Learning Practice

  • 4.4

    Applications Of Leds

    LEDs are diverse semiconductor devices utilized in a range of applications due to their energy efficiency, longevity, and versatility.

    Learning Practice

  • 4.4.1

    Lighting

    This section discusses the application of LEDs in lighting, highlighting their efficiency and advantages over traditional lighting technologies.

    Learning Practice

  • 4.4.2

    Displays

    LEDs play a vital role in modern display technologies, enhancing visual performance in TVs and digital signage.

    Learning Practice

  • 4.4.3

    Automotive Applications

    LEDs are extensively utilized in automotive lighting systems due to their energy efficiency and longevity.

    Learning Practice

  • 4.4.4

    Indicators And Indicators In Consumer Electronics

    LEDs serve essential roles as indicators in consumer electronics, showing operational status and battery levels.

    Learning Practice

  • 4.4.5

    Medical Applications

    LEDs are utilized in various medical applications, enhancing diagnostic and therapeutic procedures.

    Learning Practice

  • 4.4.6

    Communication And Optical Sensing

    This section discusses the significant role of LEDs in optical communication systems and optical sensing applications.

    Learning Practice

  • 4.5

    Advantages Of Leds

    LEDs offer significant advantages over traditional lighting technologies including energy efficiency and longevity.

    Learning Practice

  • 4.6

    Conclusion

    LEDs have transformed the lighting and display industries due to their efficiency and versatility.

    Learning Practice

References

ee6-oe-4.pdf

Class Notes

Memorization

What we have learnt

  • LEDs operate based on the e...
  • Different types of LEDs inc...
  • LEDs offer energy efficienc...

Final Test

Revision Tests