Figure 2: Single PLED device structure and performance with various EIL or BL and cathode combinations.
From: All-solution processed polymer light-emitting diode displays
(a) Device structure of the all-solution processed PLED single device with the printed nanoparticle cathode. (b) TEM image of the silver nanoparticles before curing. The nanoparticles have a polyhedron shape, and the mean particle size is 44.2 nm. Scale bar, 100 nm. (c) TEM image of the silver nanoparticles after curing. The nanoparticles become sphere-shaped (dispersed with ethanol). Scale bar, 100 nm. (d) Microscopic image of the printed cathode ink on the surface of spin-coated P-PPV. The ink aggregates to form isolated islands. Scale bar, 400 μm. (e) Microscopic image of the silver ink on the surface of spin-coated PFNR2. The ink forms a continuous film. Scale bar, 400 μm. (f) J–V–L characteristics of the devices. The solid markers represent J data, whereas the empty markers represent L values. (g) LE–J characteristics of the devices. Black for device A (ITO/PEDOT/P-PPV/Ba/Al), red for device B (ITO/PEDOT/P-PPV/PFNR2/Al), orange for device C (ITO/PEDOT/P-PPV/PFNR2/Ag), green for device D (ITO/PEDOT/P-PPV/PFNR2/nano Ag (ink-jetted)) and blue for device E (ITO/PEDOT/P-PPV/BL/nano Ag(ink-jetted).
