TECHNOLOGY LEDs


state lighting, because such a platform could play an important role in LED control technologies and add functionalities required for emerging lighting applications. One example of this is visible light communication (VLC), also known as Li-Fi, where the visible spectrum is used for free-space optical communication.


This technology is ideal for localized high-volume data transmission in the offi ce and the home. The frequency of visible light is in the range of hundreds of terahertz, so VLC has the potential for a much higher data capacity than that possible with a conventional wireless RF network. Flickering of the light source will not be an issue, because the on and off modulations that provide data transmission will occur at far higher speeds than the human eye can perceive. Meanwhile, the small form factors of the LEPICs also make them suitable for distributed lighting, with each light source serving as an independent data channel. Living in such a world, LED bulbs will not only be at the forefront of lighting – they’ll also be a big player in wireless technology.


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Figure 5. LED current and light output intensity as a function of the supply voltage and the gate voltage of the GaN MOS-channel HEMT at room temperature (left) and at 225 °C (right)


Further reading:


R. Karlicek, “Smart lighting – beyond simple illumination,” in IEEE Photonics Soc. Summer Topical Meeting Series, Seattle, WA, 2012, pp. 147-148. T. P. Chow and Z. Li, “Recent advances in high-voltage GaN MOS-gated transistors for power electronics applications,” in GaN and ZnO-based Materials and Devices. Berlin, Germany: Springer, 2012, pp. 239-250. Z. Li et. al. Appl. Phys. Lett. 102 192107 (2013)


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