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TECHNOLOGY / LED entertainment and display applications.
The OLED Lighting Design Summit Europe As discussed in the Light + Building edition of mondo*arc, OLEDs are getting a fair share of marketing in the lighting industry with many bold promises of becoming the future of lighting, so when I was invited to attend the recent OLED Lighting Design Summit Europe held in London I jumped at the chance to listen to leading players working in the field. Interestingly, Novaled a leader in OLED materials presented a series of their roadmap for different substrates, including metal, which enables improved thermal performance. Tables 2 and 3 show the roadmap for OLEDs on steel and glass substrates. They indicate that the manufacturing processes will achieve roll- to-roll by 2012 and 50lm/W with a lifetime of 50,000 hours. Table 4 highlights the OLED performance roadmap based on transparent materials which show that both the size and efficiency will be limited even out to 2014. Interestingly the majority of OLED products discussed are based on glass substrates with small physical dimensions which is why most OLED fixtures are shown with multiple small emitters. The efficiency of white OLED panels may reach 60 lm/W by 2013 however price is definitely going to be an issue as the products available today do not show a return on investment profile anywhere near that of traditional lamp sources or even LED fixtures.
GE stated during the conference they believed that OLED will only offer a viable alternative to traditional lighting as long as they can be manufactured using a Roll- to-Roll manufacturing process to enable volume manufacturing scale in order to drive down pricing.
Most OLED development to date has relied on a vacuum-based batch process to apply the organic material to one panel at a time. Elusive solution-based approaches will apply the OLED material as the base electrode sheet moves from a supply roll to a take-up roll. True R2R processes have been difficult to achieve, though GE and partners Konica Minolta claim to have solved the problem of mass production via a solution coating of materials that will enable the use of a roll- to-roll manufacturing line similar to those proven effective in the printing industry. The partners announced recently they have produced white OLED panels that deliver 56 lm/W. GE plans to introduce a commercial product in 2011 based on the solution-based approach.
Conclusions Asia is becoming a leading producer of Figure 9: The new colour tuneable 40W LED light fixtures from ENFIS
Figure 7: The new EasyWhite 2-step bins from Cree
Figure 8: Performance of OSRAMs record high efficiency red LED
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