OLEDs reach 87 lm/W energy-efficiency
The measurements were performed under application-oriented conditions in an integrating sphere, that is, without macro extractors or lenses to optimise the measurement results. Measurements were taken at a brightness of 1,000 cd/m2 and a colour temperature of approximately 4,000 K. The same laboratory sample also achieved almost 75 Im/W at a brightness of 5,000 cd/m2. The organic functional material employed was already tested in pilot manufacturing and enables product-relevant lifetimes, says the company.
The OLED sample was prepared using a pure thin-film approach. The current was distributed evenly over the active surface using a special injection electrode on the light-generating surface and offers homogenous light density from every angle, which means the aesthetics are not disrupted by visible electrode structures. OLED research at Osram is funded via the TOPAS 2012 project of the German Federal Ministry of Education and Research.
Visit Osram at www.osram.com
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