Highly efficient white OLEDs for lighting applications

Shaping White Light Through Electroluminescent Fully Organic Coupled Microcavities

“…[1][2][3][4][5] Maximum power effi ciencies larger than 70 lm W − 1 and color rendering index (CRI) values higher than 80 have been recently achieved by means of phosphorescent materials, [ 1 , 2 ] while power effi ciencies larger than 20 lm W − 1 have been obtained with more stable fl uorescent compounds. [ 3 ] In both cases external outcoupling systems have been used. Although very promising, these approaches are still based on the use of expensive [ 6 ] and relatively low conductive indium tin oxide (ITO) substrates, [ 7 ] thus leading to high fabrication costs and poor color emission homogeneity on large area devices.…”

Multiline Addressing by Network Flow

“…The aforementioned short lifetime of today's OLED displays is mainly due to the high value of I which is necessary to display images with a sufficient frame rate. This means that the peak energy which has to be emitted by the diodes of the display is very high while on the other hand, the diodes stay idle most of the time, see [13]. The high amplitudes of electrical current which alternate with long idle times put the diodes under a lot of stress, which results in a short lifetime.…”

Multiline Addressing by Network Flow

“…The aforementioned short lifetime of todays OLED displays is mainly due to the high value of I which is necessary to display images with a sufficient frame rate. This means that the peak energy which has to be emitted by the diodes of the display is very high while on the other hand, the diodes stay idle most of the time, see [6]. The high amplitudes of electrical current which alternate with long idle times put the diodes under a lot of stress, which results in a short lifetime.…”