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Current efficiency vs current density characteristics of the conventional device and the two-units stacked device.
The electronic level configurations of both the stacked WOLEDs. Numbers indicate the respective highest occupied and lowest unoccupied molecular orbital energies of all organic materials relative to vacuum.
EL spectra of (a) device A and (b) device B at different luminance normalized at the maximum value. The inset shows the CIE coordinates and the CRI values at the corresponding luminance.
Current density vs voltage characteristics of the two stacked WOLEDs. The inset shows current efficiency-current density-luminance characteristics of the two stacked WOLEDs.
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