Synthesis of new fluorene-based copolymers containing an anthracene derivative and their applications in polymeric light-emitting diodes.

We report the synthesis of copolymers containing fluorene and highly soluble anthracene derivatives, of general formula, poly{9,9'-bis-(4-octoloxy-phenyl)-fluorene-2,7-diyl-co-9,10-bis-(decy-1-ynyl)-anthracene-2,6-diyl}s (PFAnts). The PFAnts were synthesized via Suzuki coupling and the feed ratios of the anthracene derivative (Ant) were 1, 5, 10, 30, and 50 mol % of the total amount of monomer. PFAnts showed well-defined high molecular weights and were more soluble in conventional organic solvents.

New anthracene-thiophene-based copolymers that absorb across the entire UV-vis spectrum for application in organic solar cells.

We report a new class of anthracene-thiophene-based copolymers, PAT4. The UV-vis absorption spectrum of PAT4 was broad and covered the full range of the solar spectrum. The hole mobility of PAT4 was high, up to 0.

Synthesis and properties of a polyhedral oligomeric silsesquioxane-based new light-emitting nanoparticle.

A polyhedral oligomeric silsesquioxane (POSS)-based electroluminescent nanoparticle, POSS-NPA, which contains anthracenenaphthyl chromophores on each of its eight arms, was easily prepared via the hydrosilylation reaction between octakis(dimethylsiloxy)silsesquioxane and allyl-functionalized 9-naphthalene-2-yl-10-phenyl anthracene chromophores. POSS-NPA was completely soluble in common organic solvents such as chloroform, THF, toluene, p-xylene, and chlorobenzene, and showed good film-forming properties on a quartz plate or an indium tin oxide (ITO) plate, i.e.

Organic thin film transistors using a polyhedral oligomeric silsesquioxane-based photo-patternable insulating material.

We synthesized a new photo-patternable organic/inorganic hybrid material, polyhedral oligomeric silsesquioxane (POSS) derivative containing cyclohexene-1,2-epoxide functional groups (POSS-EPOXY), and fabricated an organic thin film transistor (OTFT) using pentacene as an active p-type organic semiconductor and POSS-EPOXY as a gate dielectric layer to demonstrate its applicability for organic electronics. The pentacene transistor with the POSS-EPOXY layer shows comparable transistor characteristics as that with the prototypical polymeric gate insulator of poly(vinylphenol) (PVP). They exhibit field-effect mobility of micro(FET) approximately 0.

Charge-transfer character of excitons in poly[2,7-(9,9-di-n-octylfluorene)(1-x)-co-4,7-(2,1,3-benzothiadiazole)(x)].

Quantum-chemical calculations performed on poly[2,7-(9,9-di-n-octylfluorene)(1-x)-co-4,7-(2,1,3-benzothiadiazole)(x)] copolymers (0 < or = x < or = 0.5) show that the lowest unoccupied molecular orbital is always highly localized on the benzothiadiazole (BT) units while the highest occupied molecular orbital is delocalized over the whole chain. Chains with a low BT content are characterized by a reduced oscillator strength of the lowest optical transition and by an increased charge-transfer character of the exciton.

Synthesis of a new polymeric host material for efficient organic electro-phosphorescent devices.

We have synthesized a new polymeric host material for phosphorescent dyes, which can be used in phosphorescent light-emitting layers. An alternating copolymer, composed of N-alkylcarbazole and tetramethylbenzene units was synthesized through the Suzuki coupling reaction. We fabricated electro-phosphorescent devices using the synthesized polymeric host doped with solution-processible green and red phosphorescent dyes.