The development or organic light-emitting diodes (OLEDs) also continues apace. The world’s first planar light source, they are applied as a coating to either glass orplastic and open up a whole range of new applications. Above all, they allow light to be used directly, i.e. with no loss due to reflectors. The first marketable OLED luminaires have already been unveiled. Further advances in efficiency and longevity are anticipated.