Breakthrough set to bring OLED back from the dead

A BREAKTHROUGH by scientists at Brunel University London is set to slash the costs of OLED by 92 per cent, potentially bringing the technology back from the brink in the architectural lighting market.

OLED panels in, from top, a direct/indirect luminaire, a super-slim emergency exit sign and a creative application in architecture.

Organic light emitting diodes have struggled to compete with standard LED panels for lighting in buildings, as their extra slimness can’t justify their much higher price. Instead OLEDs have been used in electronic devices such as mobile phones and televisions.

But now a three-year EU-funded study – whose backers include Marks & Spencer and Tata Steel – has discovered that a much simpler manufacturing method can cut production costs to just a tenth of current costs, enough to match LEDs.

It’s hoped that the research of the Flexolighting programme, which will be made available to European manufacturers, will help herald a new era of low-cost, high-efficiency lighting products.

‘Flexolighting essentially deconstructed the OLED panel and re-imagined it as a series of individual elements that together can be repackaged to realise cost-effective and environmentally-less harmful solutions,’ Professor Poopathy Kathirgamanathan, chair professor in electronic materials engineering at Brunel told Lux.

Backed by £4 million (€4.4 million, US$5.2 million) from the European Union’s Horizon 2020 research and innovation programme, the group was set the ambitious challenge of reducing the cost of producing OLEDs down to around 90 pence (€1, US$1.2) per 100 lumens – from their current position of around £13.4 (€15, US$17.6) per 100 lumens.

By introducing a number of innovative techniques, such as ‘printing’ some of the OLED’s layers onto flexible steel rather than the more traditional glass, and using a newly developed light extraction film to double the OLED’s illumination, the group achieved a potential cost of £1.07 (€1.20, US$1.4)  per 100 lumens – or a 92 per cent reduction in cost.

‘We’ve pushed the state-of-the-art to achieve world firsts in processing technologies, used novel materials such as planarised flexible steel and developed transparent top contacts with metallic films,’ said Professor Kathirgamanathan.

‘We also proved thin film encapsulation, and showed how effective light extraction can be.

The team of scientists at Brunel University used novel materials such as planarised flexible steel and developed transparent top contacts with metallic films in their research into low-cost OLED. Pic: Brunel University

‘The result is a highly innovative concept. By breaking away from existing limitations, we now no longer need to rely on glass substrates and glass encapsulation – we can turn the OLED upside down, maintain conductivity with alternative anodes and cathodes, process the device in a new way and protect it with a thin film.

‘The end product is one that can be formed into an infinite number of design choices, and it was all made possible with European expertise and know-how.’

Whilst no products have yet been released using the group’s new techniques, it’s expected that they will find application in a number of industries, from domestic and commercial lighting, to cars and wearable technology.

‘Flexolighting is a very compelling proposition,’ said Professor Kathirgamanathan, ‘and it’s one that, thanks to the commercial success of OLED displays in the consumer electronics sector, is very easy to envisage becoming commercially fruitful in its own right.’

 

  • See the latest in OLED technology at this year’s LuxLive 2018 exhibition at ExCeL London. The show takes place on Wednesday 14 November and Thursday 15 November 2018. Entry is free. For more details, click HERE.