Macromol. Rapid Commun. 24/2009

Abstract

Industrial zone – Steel Pipelines and Cables in Blue Tones. Copyright: Andrei Merkulov – Fotolia.com

Light‐Induced Solubility Modulation of Polyfluorene To Enhance the Performance of OLEDs

“…[20] Thecinnamate group was linked to the conjugated backbone by as imilar strategy as that presented by Holdcroft and co-workers,w hich yielded the benign alcohol after cleavage. [21] Ap olyfluorene copolymer was prepared from afunctionalized monomer building block with the installed cleavable group to investigate light-induced solubility modulation by one-photon processes in thin films. Furthermore,t his concept of solubility modulation was investigated for its application in solution phase processed OLEDs.The synthesized fluorene copolymer was used as the emitting layer in an OLED with as imple stack architecture.…”

“…[7] However,s olution-phase processing is the key prerequisite for printing.S ome strategies have been developed to overcome the limitations associated with the solution-phase processing of multiple layers.Most rely on the transformation of soluble precursors,e ither by light or thermal treatment, to induce cross-linking [8][9][10] or cleavage of solubilizing side chains. [3,15,16] Initial studies by Jullien and co-workers showed that substituted o-hydroxycinnamates can be used as light-responsive groups for the release of alcohols. [3,15,16] Initial studies by Jullien and co-workers showed that substituted o-hydroxycinnamates can be used as light-responsive groups for the release of alcohols.…”

“…[11][12][13][14] In addition, high spatial resolution of these processes is critical to realize more-sophisticated device architectures,such as pixelated OLED displays.This is mostly achieved by photolithography-like techniques to create spatial resolution. [3,15,16] Initial studies by Jullien and co-workers showed that substituted o-hydroxycinnamates can be used as light-responsive groups for the release of alcohols. [17,18] Herein, we report dibutylamino-substituted o-hydroxycinnamates as lightresponsive groups for modulating the solubility of polyfluorenes.…”

An In Situ Investigation into the Formation of the Solvent‐Induced Crystalline Phase of Poly(9,9‐Dioctylfluorene) in Solvent Vapor Annealing

“…[1][2][3][4] Among the PF family, poly (9,9-dioctylfl uorene) (PFO) has attracted tremendous attention. It is a versatile building block for conjugated polymers, with wide applications in low cost optoelectronic devices, such as polymer blue-light-emitting diodes (PLEDs), [5][6][7][8][9] sensors, and electrically pumped organic lasers. [ 10,11 ] It has also been widely investigated as an impressive model system that adopts particular helical conformations and has rich polymorphisms.…”

Lichtinduzierte Steuerung der Löslichkeit von Polyfluoren zur Steigerung der Leistung in OLEDs

“…Eine hohe Ortsauflçsung dieser Prozesse ist wünschenswert für Bauteilarchitekturen, wie gepixelte OLEDs.D ies konnte beispielsweise durch die Verwendung photolithographischer Te chniken erreicht werden. [15,16] Studien von Jullien et al haben gezeigt, dass substituierte o-Hydroxyzimtsäureester als Gruppen zur lichtinduzierten Freisetzung von Alkoholen genutzt werden kçnnen. [17,18] Hier werden Dibutylamino-substituierte o-Hydroxyzimtsäureester als schaltbare Gruppen zur Lçslichkeitssteuerung von Polyfluorenen vorgestellt.…”