Color optimization of single emissive white OLEDs via energy transfer between RGB fluorescent dopants

The electroluminescent characteristics of white organic light-emitting diodes (WOLEDs) were investigated including single emitting layer (SEL) with an ADN host and dopants; BCzVBi, C545T, and DCJTB for blue, green and red emission, respectively. The structure of the high efficiency WOLED device was; ITO/NPB(700Å)/ADN: BCzVBi-7%:C545T-0.05%:DCJTB-0.1%(300Å)/Bphen(300Å)/Liq(20Å)/Al(1200Å) for mixing three primary colors. Luminous efficiency was 9.08cd/A at 3.5V and Commission Intenationale de L’eclairage (CIEx,y) coordinates of white emission was measured as (0.320, 0.338) at 8V while simulated CIEx,y coordinates were (0.336, 0.324) via estimation from each dopant's PL spectrum.