Single-stack white OLED device

Single-Stack White OLED Devices Incorporating Phosphorescent Emitters... 

Nakayama et al. reported highly efficient and stable single-stack white phosphorescent OLEDs based on blue triplet emitter KMBD-342 described in Section 14.4.2.3. Yellow-green (YD-85) and red (RD-61) dopants used in the device were provided by Universal Display Corporation. The device layer structure was as follows Light outcoupling film ITO HIL HTL green EML red EML I blue EML HBL n-doped ETL A1. At 1000cd/m the performance... 

In the vapor-deposited OLED community, a number of approaches have been employed to produce white light emission. White OLEDs have been demonstrated based on multilayer structures, e.g., stacked backlights [153,168], multidoping of single-layer structures [145], phosphorescent monomer-excimer emission layers [169] and on doping of phosphorescent materials into separate bands within the emission zone, called a tri-junction [170]. The trijunction device has produced the highest white OLED efficiency of 16% external quantum efficiency demonstrated thus far [171]. 

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