Dupont scientists design a new architecture for electrically polarized layers in the OLED stack

Researchers from Dupont have developed a new OLED device architecture that has electrically polarized layers in the OLED stack. In this architecture, unlike previous polarized layers OLED devices attempts, there is less reduction in efficiency (caused by quenching of excitons).

The new architecture is based on molecules that form layers with substantial polarization. Using simulation methods, the researchers predicted the degree of polarization. By employing such materials in both the emissive layer and the adjacent electron-blocking layer, it was found that the device’s EQE is improved when the difference in polarization between the two layers is reduced. 

The researchers have also found that when mixing two materials, the polarization of the mixed film can be linearly interpolated based on the mixing ratio and polarization of each individual component.