Advanced Materials

Achieving High-Efficiency Polymer White-Light-Emitting Devices


  • We thank Professor Xu Zhongying from the Institute of Semiconductors, Chinese Academy of Science, for the TRPL measurement. We also thank Professor Neil Greenham from Cambridge University and Professor Junji Kido from Yamagata University for helpful discussions. Financial support is provided by the National Science Foundation (DMR-0305111) and the Air Force Office of Scientific Research (FA9550-0401-0215).


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.

original image