May 24 2010
Major OLED company Novaled has demonstrated a white OLED that emits light at the top.
OLEDs on metal - Luminarie concept study 'Screen' with Novaleds high efficiency long lifetime white and orange OLEDs
At 1000 cd/m2 of initial luminance, the power efficiency of the OLED is 30 lm/W with a lifetime of more than 50,000 h. Its structure is that of a typical OLED that it is designed on metal substrates, which offer many benefits including mechanical stability, good heat dissipation and bended designs. The metal substrates also help in reducing the roll-to-roll production costs.
The new white OLED product offers high performance, as it incorporates the company’s PIN OLED technology. The technology integrates Novaled’s proprietary host and doping materials together with SFC Korea’s blue florescent emitting material. The top contact of the OLED is ITO free. To provide improved efficiency, the product is made with a layer of Novaled-specific light extraction outcoupling material. The material minimizes the color shift when on a wide viewing angle and makes it undetectable by the naked eye.
The longer lifetime means that the OLED can operate continuously for over five years. The new product achieved good CIE color coordinates and broad emission spectrum, which is within the U.S. DoE quadrangles and near to the illuminant A.
The company’s CEO Gildas Sorin said that the demonstration showcased the potential and strength of their PIN technology. Different configurations such as inverted, non-inverted, bottom and top organic structures featuring various metal electrodes and emitting materials offer the appropriate high performance for every specific demand in the lighting and display markets, he noted.