Color-variable electroluminescence from multilayer polymer films

Abstract

Electroluminescence from poly(phenylene vinylene) in a planar metalpolymermetal structure

Polarized fluorescence and electroluminescence from rubbing-aligned conjugated polymers and their composites with fluorescent dyes

“…The same dichroic ratio of 2.6 was observed for electroluminescence and optical absorption. The rubbing-induced molecular orientation is thought to take place from the surface of the film; however, these results indicate that EL emission originates not just from the oriented surface layer but from the entire sample, which is consistent with the results for rubbing-aligned NO-PPV films [4]. We also noted that EL devices with rubbingaligned films of other PATs gave similar results.…”

“…The dichroic ratio of photoluminescence (the ratio of maximum intensities of emission parallel and perpendicular to the rubbing direction) was 3.9. Thus, it is apparent that the polymer main chain is aligned parallel to the rubbing direction as in the case of NO-PPV [2,4]. Figure 4 shows the spectral change of PAT-8 with rubbing treatments.…”

“…The EL properties were evaluated on the sample immersed in liquid nitrogen. The details of the fabrication and measurements of EL devices have been described elsewhere [2,4].…”

“…In the previous papers, we firstly employed the rubbing treatment to polymer EL devices, and demonstrated that rubbing-aligned poly(2,5-dinonyl-oxy-p-phenylenevinylene) (NO-PPV) films exhibited polarized EL [2,4].…”

Organic Light‐Emitting Diodes

“…However, polymer blends have generally been used to fabricated WPLEDs (as multilayer spin-coated polymer assemblies are difficult to obtain owing to close solubility parameters of materials), such as red, green, blue light-emitting three-polymer systems [257][258][259] and twopolymer blends containing macromolecular materials emitting two complementary colors [260][261][262][263][264][265]. For example, an efficient WPLED has been reported by Huang et al by blending polyfluorene V as a blue emitter, with a small percent of MEHPPV XIIas a source of orange-red light.…”