High-Efficiency, Solution-Processed, Multilayer Phosphorescent Organic Light-Emitting Diodes with a Copper Thiocyanate Hole-Injection/Hole-Transport Layer

摘要

Following early breakthrough reports on vacuum-deposited small molecule and solution-processed conjugated polymer organic light-emitting diodes (OLEDs), tremendous progress has been made in commercializing smartphone, tablet, and television display products. OLED lighting offers additional challenges including very demanding efficiency requirements set by the ≈100 lm W~(-1) luminous power efficiency of fluorescent lamps. Vacuum-processed OLEDs have recently passed this 100 lm W~(-1) target, thereby stimulating continued interest in large area lighting applications. However, vacuum processing at scale, especially where shadow-masked pixellation is required, remains challenging and costly. Strong and growing interest has consequently been shown in solution-based processes (e.g. ink-jet or gravure printing or slot-die coating) to address these limitations and achieve the ultimate potential of plastic electronics in large-area, low-cost, high-throughput device fabrication.