Inthispaper,wesuccessfullydemonstratedhigh colorrendering index (CRI) and color stable white organic light-emitting diodes (WOLEDs) based on a hole-type single-host double emissive layer (EML) structure. By combining the yellow phosphorescent emission with the blue monomer and red excimer emission of platinum [1,3-difluoro-4,6-di(2-pyridinyl)benzene]chloride
(Pt-4), the devices exhibited a maximum CRI of 93, which was attributed to the perfect spectrum complement and the relative intensity adjustment of each emission peak. Meanwhile, the WOLEDs were very stable and showeda slightcolor coordinate shift of ( 0.007, 0.004) over a wide range of driving voltages from 4 to 10V. The use of the double EML structure effectively confines the exciton generation zone in the Pt-4 EML, thus, the
white-light emission comes from the energy transfer from host toPt-4andthentoyellowphosphor,whichislessaffectedbythe driving conditions