Team develops highly efficient white OLED
24 June 2009
News
News
Opto-Electronics
The Technical University of Dresden and Novaled have attained 90 lm/W at a brightness of 1000 cd/m² for a 'real lighting device' and 124 lm/W when using a 3D light-extraction system. An in-depth article on the project, 'White organic light-emitting diodes with fluorescent tube efficiency', was published in a recent edition of Nature magazine.
These white OLED ultra-thin large-area-emitting devices are flexible, transparent, colour-tuneable and scaled to virtually any size or shape, enabling new lighting design methods. “In our approach, we combine a novel, very energy efficient emission layer design with improved light out-coupling concepts, leading to this breakthrough,” says project leader Sebastian Reineke, physicist at the Institute of Applied Photophysics (IAPP, TU Dresden). “The power efficiencies of the record devices reach 90 lm/W even if only flat, scalable out-coupling techniques are used. With special 3D out-coupling measures, as high as 124 lm/W has been achieved.”
Both values were determined in an integrating sphere with blocked substrate edges, only taking into account light emitted to the forward hemisphere with CIE colour coordinates of (0,41/0,49). “The potential of the devices is obvious when one considers that even at the very high brightness of 5000 cd/m², a power efficiency of 74 lm/W is obtained,” commented Karl Leo, director of IAPP. “Thus high-intensity illuminations at very high efficiencies are possible as well.”
“These results are at an R&D level and further developments need to be made, eg, for reaching commercially acceptable lifetime,” says Gildas Sorin, CEO of Novaled. “However, the values clearly indicate a major breakthrough and qualify OLEDs for mainstream lighting applications. White OLEDs will soon help to reduce our carbon footprint and the Novaled doping technology will play a key role in this development,” adds Sorin.
Further reading:
From the editor's desk: Inspiring the next generation
Technews Publishing
News
Welcome to the August issue of
Dataweek. Peter Howells is still on leave, so I am back for this issue. I hope you enjoy the content and find value in it.
August is Women’s Month in South Africa,
...
Read more...
Procurement is becoming a competitive advantage
RS South Africa
News
As mining, manufacturing and industrial businesses continue to navigate rising costs, supply chain disruption and increasing pressure to improve operational performance, procurement and inventory management have become strategic business priorities rather than simply administrative functions.
Read more...
Powell Electronics signs partnership agreement with IOT Electronics
IOT Electronics
News
Powell Electronics has entered into a partnership agreement with IOT Electronics to strengthen its presence across southern Africa.
Read more...
Omniflex delivers ICCP systems across London
Omniflex Remote Monitoring Specialists
News
Omniflex has supplied impressed current cathodic protection (ICCP) systems for a range of prominent buildings across London, helping to protect reinforced concrete structures from corrosion and extending their service life.
Read more...
New appointments for Würth Electronics South Africa
Würth Electronics South Africa
News
New appointments for Würth Electronics South Africa
Read more...
MTN celebrates 80 Western Cape digital graduates
News
Eighty unemployed young people from across the Western Cape have successfully completed MTN South Africa’s Digital Skills for Digital Jobs (DS4DJ) programme, earning accredited qualifications in Data Analytics, Systems Development and Cybersecurity.
Read more...
GirlCode Hackathon 2026 kicks off across South Africa and Botswana
News
GirlCode, in partnership with Absa Group, Truecaller, MTN, SAP Fioneer, RS South Africa and other ecosystem partners, successfully hosted the first leg of the 2026 GirlCode Hackathon.
Read more...
Rooibos heads to space
News
A South African scientific initiative linking agriculture and space research has officially launched today with the Rooibos in Space programme at Parklands College’s Innovation Centre in Cape Town.
Read more...
From the editor's desk: Local can be international
Technews Publishing
Editor's Choice News
Welcome to the July 2026 issue of
Dataweek. As you can see from this introduction,
Dataweek’s regular editor, Peter Howells, is on extended leave and I am filling the void in his editor’s column – hopefully without being too boring.
Read more...
Landis+Gyr EMEA introduces new company name: EYKON
News
EYKON is the new company name of Landis+Gyr EMEA, formerly part of the Landis+Gyr Group. The company supports electricity, gas, water and thermal utilities in managing increasingly complex networks, improving operational efficiency and enabling more sustainable use of resources.
Read more...
printer friendly version