Organic light emitting materials have attracted increasing interest in the past two decades. Soluble light emitting polymers are even more appealing for manufacture of large area, low cost light emitting devices. In recent years, screen and inkjet printing have been successfully applied to this area, promising lower cost for area lighting, patterning and display applications. In order to achieve low cost and high efficiency, it is crucial to have an air stable cathode with efficient electron injection properties.
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