A Solution-Processed Resonance Host for Highly Efficient Electrophosphorescent Devices with Extremely Low Efficiency Roll-off

Ye Tao; Xin Guo; Lin Hao; Runfeng Chen; Huanhuan Li; Yuehua Chen; Xinwen Zhang; Wenyong Lai; Wei Huang

doi:10.1002/adma.201503108

A Solution-Processed Resonance Host for Highly Efficient Electrophosphorescent Devices with Extremely Low Efficiency Roll-off

Adv Mater. 2015 Nov 18;27(43):6939-44. doi: 10.1002/adma.201503108. Epub 2015 Sep 30.

Authors

Ye Tao¹, Xin Guo¹, Lin Hao¹, Runfeng Chen¹, Huanhuan Li², Yuehua Chen¹, Xinwen Zhang¹, Wenyong Lai², Wei Huang²

Affiliations

¹ Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing, 210023, China.
² Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (Nanjing Tech), 30 South Puzhu Road, Nanjing, 211816, China.

PMID: 26421529
DOI: 10.1002/adma.201503108

Abstract

Solution-processible N-P=O resonance-host molecules are applied successfully in spin-coated phosphorescent light-emitting diodes (PHOLEDs) to selectively and self-adaptively tune the electrical properties for balanced charge transportation. The resonance-molecule-hosted PHOLEDs exhibit a high maximum quantum efficiency of 16.5% and a low efficiency roll-off down to 0.7%, highlighting the significant progress of these solution-processed PHOLEDs with high efficiency and flat efficiency roll-off achieved simultaneously.

Keywords: dynamic adaptation; efficiency roll-off; phosphorescent light-emitting diodes (PHOLEDs); resonance hosts; solution processing.