Achieving High‐Efficiency Polymer White‐Light‐Emitting Devices

Abstract

The efficiency of polymer light-emitting devices can be significantly increased by introducing an electron-injection and a hole-blocking layer and by using a polymer blend system as the active material. Blending high-bandgap and low-bandgap polymers introduces charge traps into a light-emitting polymer layer. Depending on the blend ratio, a peak efficiency of 16 lm W–1 is observed (see Figure), the highest yet reported for a white-light-emitting polymer device.