Transparent OLED prototype shows clear advantage
Osram Opto Semiconductors has demonstrated a transparent white OLED prototype that has achieved a luminous efficacy of more than 20lm/W at a brightness of 1000cd/m². The large-scale prototype is transparent either on or off. This opens up possible applications such as partitions that are almost invisible by day and then provide a pleasant diffused light at night.
The prototype of the transparent white OLED tile with color coordinates 0.396/0.404 (CIEx/y main emissive side) lights up over an area of almost 90cm m². At present, the transparence of the OLED is 55 percent. As the product is further developed this value is expected to rise to 75 percent. The relative strengths of the beams in the two hemispheres can be adjusted within a wide range. This means that a surface light source installed for example in furniture or on a canopy can be configured so that light shines only in the required direction. The results were achieved as part of a project of the Germany Ministry for Education and Research, organic light emitting diodes for illumination applications.
OLEDs are complementary to most existing light sources and will open up entirely new areas of application. They are already inspiring designers and will be enriching the market for premium designer luminaires in the near future. At a later date we expect to see revolutionary changes to the entire lighting market. Visions of the future include illuminated partitions and canopies, and the integration of these light sources in a wide variety of applications on the general lighting market to create a special atmosphere.