RGB Recombination Zone Tuning to Improve Optical Characteristics of White Organic Light-Emitting Diodes

White organic light emitting diodes (WOLEDs) were fabricated using blue, green and red emitting layers (EMLs). The device has a structure of ITO/NPB/EML/Alq3/Liq/Al. Here, to control the white color balance, the location of the blue EML in the WOLEDs was fixed and only the thickness of blue EML was changed while both thickness and position of the green and red EMLs were adjusted. When adjusting the thickness of blue EML, the occurrence area of …