Based on its proprietary Novaled PIN OLED(R) technology and materials, Novaled achieved significant improvements for white OLEDs for lighting applications. An OLED device with an efficiency of 35 lm/W at a brightness of 1,000 cd/m2 and a lifetime of above 100,000 h has been realized. The device exhibits CIE colour coordinates of x,y = 0,43/0,44 with a colour rendering index CRI of 90.
The OLED features a stacked setup with blue fluorescent and red/green phosphorescent emitter materials (hybrid approach). For the stacking layer and transport layer Novaled proprietary materials have been used. The OLED device is equipped with a standard outcoupling enhancement film. The measurement was carried out in an integrating sphere taking into account only the full forward emission with substrate edges and backside covered, thus corresponding to a real case application. At a brightness level of 4,000 cd/m2 the efficiency is 31 lm/W, with no significant changes in colour and CRI value.