Figure 4
From: Efficient white phosphorescent organic light-emitting diodes using ultrathin emissive layers (<1 nm)
(a) EL spectra of devices (F1, F2 and F3) with different thickness of interlayers that between orange and red dyes at 6 V. (b) Current efficiencies versus current density of devices F1, F2 and F3. Inset: Current density-Voltage-Luminescence J-V-L characteristic of devices F1, F2 and F3. (c) The EL spectra of the device F3 at different operating voltages. (d) Transient PL lifetime of orange film and orange-red film.
