Light-emitting diode technologies

Light-emitting diode technologies

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LED technology is inherently superior in terms of energy efficiency (with wall plug efficiency exceeding 40%), reliability (lifetime exceeding 50,000 h), robustness and environmental friendliness (involving no hazardous materials). Compared to the CFL which delivers 60 lumens/W of energy consumed, the most advanced white light LEDs are capable of providing over 100 lumens of optical power with the same amount of energy consumed. With further breakthroughs in material epitaxy, chip design, device processing and die packaging, there is plenty of room for boosting energy efficiencies to even higher levels, benefitting not just general lighting but a wide range of scientific applications.

Chapter Contents:

  • 4.1 Introduction
  • 4.2 Light extraction
  • 4.2.1 Chip shaping
  • 4.3 Device functionalities
  • 4.3.1 Micro-LEDs
  • Distinguishing features and performance of micro-sized LEDs
  • 4.3.2 Fiber-coupling
  • Fiber-coupled LEDs
  • Fiber-coupled micro-LED arrays
  • 4.4 Conclusions
  • References

Inspec keywords: semiconductor device reliability; optical fibre couplers; light emitting diodes; micro-optics

Other keywords: energy efficiency; LED technology; general lighting; chip design; white light LEDs; reliability; light-emitting diode technologies; material epitaxy; die packaging; energy efficiencies; plug efficiency; environmental friendliness

Subjects: Fibre optics; Light emitting diodes; Reliability; Micro-optical devices and technology

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