Public Release: 

Multi-tasking micro-lights could spark a communications revolution

Engineering and Physical Sciences Research Council

Tiny LED lights now being developed could deliver Wi-Fi-like internet communications, while simultaneously displaying information, and providing illumination for homes, offices and a whole host of other locations.

Over the next four years, with Engineering and Physical Sciences Research Council (EPSRC) funding, a consortium of UK universities led by the University of Strathclyde will be developing this innovative technology to help unleash the full potential of 'Li-Fi' - the transmission of internet communications using visible light rather than the radio waves and microwaves currently in use.

Although the potential possibilities offered by Li-Fi are already being explored all over the world, this EPSRC-funded consortium is pursuing a radical, distinctive vision that could deliver enormous benefits.

Underpinning Li-Fi is the use of light emitting diodes (LEDs), a rapidly spreading lighting technology which is expected to become dominant over the next 20 years. Imperceptibly, LEDs flicker on and off thousands of times a second. By altering the length of the flickers, it is possible to send digital information to specially adapted PCs and other electronic devices - making Li-Fi the digital equivalent of Morse Code. This would make the visible part of the electromagnetic spectrum available for internet communications, easing pressure on the increasingly crowded parts now used.

But rather than developing Li-Fi LEDs around 1mm2 in size, which other researchers around the world are concentrating on, the EPSRC-funded team is developing tiny, micron-sized LEDs which potentially offers a number of major advantages:

Firstly, the tiny LEDs are able to flicker on and off 1,000 times quicker than the larger LEDs this also means they can transmit data more quickly. Secondly, 1,000 micron-sized LEDs would fit into the space occupied by a single larger 1mm2 LED, with each of these tiny LEDs acting as a separate communication channel. A 1mm2 sized array of micron-sized LEDs could therefore communicate 1,000 x 1,000 (-i.e. a million) times as much information as one 1mm2 LED.

Moreover, each micron-sized LED would act as a tiny pixel. So one large LED array display (e.g. used to light a living room, a meeting room or the interior of an aircraft), could also be used as a screen displaying information at exactly the same time as providing internet communications and the overall room lighting.

Professor Martin Dawson of the University of Strathclyde, who is leading the initiative, says: "Imagine an LED array beside a motorway helping to light the road, displaying the latest traffic updates and transmitting internet information wirelessly to passengers' laptops, netbooks and smartphones. This is the kind of extraordinary, energy-saving parallelism that we believe our pioneering technology could deliver."

Eventually, it could even be possible for the LEDs to incorporate sensing capabilities too. For example, your mobile phone could be equipped with a flash that you point at a shop display where everything has been given an electronic price tag, and the price of all the items and other information about them would show up on your phone's display.

You can find out more about the research in an audio slide show on the EPSRC YouTube channel. (NB the full link address is (NB this will be live from 00.01hrs, Friday 25th January 2012). The title of the audio slide show is 'Li-Fi Multi-tasking micro-lights could spark a communications revolution'.

To enable the remarkable potential to be realised, the consortium has drawn together a unique breadth and depth of expertise unmatched by any other Li-Fi research team anywhere in the world.

Professor Dawson says: "The Universities of Cambridge, Edinburgh, Oxford and St Andrews are all working with us, bringing specific expertise in complementary areas that will equip the consortium to tackle the many formidable challenges involved - in electronics, computing and materials, for instance - in making this vision a reality. This is technology that could start to touch every aspect of human life within a decade."


Notes for Editors

The term Li-Fi was coined by one of the partners in the project, Professor Harald Haas from the University of Edinburgh in a TED talk in July 2011. For more information see:

Emerging spin-out companies that are related to this research are: mLED see and pureVLC see The research team will harness LEDs made from gallium nitride, a material whose properties are ideal for high-power, high-frequency applications.

The visible part of the electromagnetic spectrum is 10,000 times bigger than the microwave part of the spectrum. Li-Fi could therefore make a huge contribution to enabling growing demand for internet communications to be met in future.

Li-Fi cannot be achieved using standard incandescent or fluorescent light bulbs.

One micron is one millionth of a metre.

The Engineering and Physical Sciences research Council (EPSRC) is the UK's main agency for funding research in engineering and physical sciences. EPSRC invests around £800m a year in research and postgraduate training, to help the nation handle the next generation of technological change. The areas covered range from information technology to structural engineering, and mathematics to materials science. This research forms the basis for future economic development in the UK and improvements for everyone's health, lifestyle and culture. EPSRC works alongside other Research Councils with responsibility for other areas of research. The Research Councils work collectively on issues of common concern via research Councils UK.

The University of Strathclyde is one of Europe's leading centres in research on the materials and device underpinnings of 'Solid-State Lighting', the transformative replacement of traditional incandescent and fluorescent lamps by energy-efficient, long-lasting and environmentally-friendly, semiconductor based, light-emitting diode (LED) technology. The University's research in this area over the past decade has been funded by EPSRC, TSB, EU and RCUK programmes totalling more than £15 million.

With the express target of drawing academic and industrial expertise together to address the solid-state lighting/electronics interface and its implications for custom-controlled lighting systems, the University of Strathclyde is establishing a new research centre, the Intelligent Lighting Centre (ILC), based on its leading R&D capability and housed in its innovative Technology and Innovation Centre (TIC) - a £103 million research and innovation hub currently under construction. The University of Strathclyde is also leading a new £4.6 million Programme Grant 'Ultra-parallel visible light communications: UP-VLC', funded by EPSRC from September 2012 to August 2016, which seeks to investigate the profound implications of solid-state lighting for next-generation optical communications. This programme, involving collaborations with the Universities of St. Andrews, Oxford, Cambridge and Edinburgh, aims to pioneer the creation of an entirely new data communications infrastructure based on solid-state lighting, where lighting components provide both illumination and an ultra-high-bandwidth 'Light Fidelity (Li-Fi)' technology complimentary to traditional Wi-Fi.

For more information on the University of Strathclyde visit:

For more information, contact:

Professor Harald Haas, University of Edinburgh, tel: 0131 650 5591, e-mail: (available from 11 am on Thursday 24th January 2012 for interviews)

Professor Martin Dawson, University of Strathclyde, tel: 0141 548 4663, e-mail: (Professor Dawson will be available from 9am on Friday 25th January, 2013)

Images are available from the EPSRC Press Office. Contact tel: 01793 444404, e-mail:

Image captions:

ProfDawson.jpg: Professor Martin Dawson from the University of Strathclyde who is leading this research.

ProfHaas.jpg: Professor Harald Haas, from the University of Edinburgh (who originally coined the term Li-Fi), is a partner in this research project.

Ledlight.jpg: In the long-term larger LED lights like this could be replaced by arrays of micron-sized LEDS which will enable many different tasks to be carried simultaneously such as powering a laptop, providing illumination and displaying information.

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