Neutral Conjugated Surfactants as Electron Injection Layer in Polymer Light-emitting Diodes

Introduction Significant improvements have been made in polymer light-emitting diode (PLED)
technology, including improved efficiency, high brightness, and low drive voltage. Despite advances, operational stability remains a challenge for PLED technology. There still remains a need for an efficient electron injection material that is compatible with high work-function cathodes but does not degrade device performance during operation. Technology description Alex Jen’s laboratory has developed neutral conjugated surfactants for the electron injection layer in PLEDs. Compared to the commonly used neutral surfactants (such as PEG and PPG), these surfactants possess good conductivity and excellent electroninjection ability from high-work-function metals. These advantages should benefit the fabrication of flat-panel displays with an improved lifetime. The combined simple fabrication process and improved device performance demonstrate the potential of using these neutral conjugated surfactants for high-efficiency PLEDs. Business Opportunity The worldwide LED market is expected to reach $9 billion by 2011. Intellectual Property Position The UW has US and foreign patents pending on this technology. Publication(s)
Huang F et al, A Conjugated, Neutral Surfactant as Electron-Injection Material for High- Efficiency Polymer Light-Emitting Diodes. Advanced Materials. 2007 June; 19(15):2010- 2014.

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