Li-Fi LED & Terahertz

02 · Section 1: Introduction

The presentation explores semiconductor technologies, focusing on light-emitting diodes (LEDs), laser technologies, and their applications.

03 · Section 2: LED Technology - Light Fidelity (Li-Fi)

• Introduction to the latest LED technology: Light Fidelity (Li-Fi), used in visible light wireless communication.

• Material science advancements: Gallium-nitride based semiconductors enable higher operating frequencies for Li-Fi.

• Li-Fi Advantages: Compatibility with WiFi technology, energy efficiency, quality of service, and no interference with WiFi.

• Li-Fi Limitations: Need for LEDs to remain on for data transmission, susceptibility to interference from sunlight.

04 · Section 3: Terahertz Technology

• Introduction to terahertz technology as a transformative scientific field.

• Role of Quantum Cascade Lasers (QCL) in terahertz research.

• Advantages: Penetration through opaque materials, safety for organisms, utility in biomedicine, and specific frequency applications.

• Application: Leeds team’s breakthrough in climate research using QCL in satellite programs.

• Challenges: Limited availability of terahertz radiation sources, technical and cost barriers, difficulties in interaction with terahertz frequency range.

05 · Section 4: Technology Readiness Levels (TRL) of LED and Terahertz Devices

• TRL for LED: Assessed at level 8 due to its maturity, safety, longevity, and efficiency.

• TRL for Terahertz Devices: Rated at level 5, considering the high cost, limited civilian use, and experimental stage in medical applications.

• Discussion on challenges in advancing through TRL stages, particularly from levels 3 to 4 and 7 to 8.

06 · Section 5: Conclusion

Summary of topics covered: Li-Fi technology, terahertz technology, and their respective TRLs.