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
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What we have learnt
- LEDs operate based on the electroluminescence phenomenon, emitting light when current passes through a semiconductor.
- Different types of LEDs include Standard LEDs, High-Power LEDs, SMD LEDs, OLEDs, and QLEDs, each with specific applications.
- LEDs offer energy efficiency, a long lifespan, durability, and environmental benefits over traditional lighting technologies.
Key Concepts
- -- Electroluminescence
- The process by which a material emits light in response to an electric current.
- -- PN Junction
- The interface between p-type and n-type semiconductors that facilitates the movement of electrons and holes in an LED.
- -- Energy Band Gap
- The energy difference between the valence band and conduction band in a semiconductor, influencing the color of emitted light.
- -- OLED
- Organic Light Emitting Diodes made from organic compounds that offer flexibility and high contrast for displays.
- -- QLED
- Quantum Dot LEDs that enhance color output using nanoscale semiconductor particles.
Additional Learning Materials
Supplementary resources to enhance your learning experience.