Cambridge Display Technology Limited

Eastman-kodak Company

Sumitomo Chemical Company, Limited

Tania Zuberi

Sheena Zuberi

Stephen P Singer

Thomas Kugler

Bernard A Clark

Louis Elbert Friedrich

Philip A Allway

Charles E Heckler

Jeremy H Burroughes

Kiran Timothy Kamtekar

Richard J Wilson

Florence Bourcet

A material substituted with a group of formula (I): wherein: Aris an aryl or heteroaryl group; Sprepresents a first spacer group; n1 is 0 or 1; m1 is 1 if n1 is 0 and m1 is at least 1 if n1 is 1; Rindependently in each occurrence is H or a substituent, with the proviso that at least one R1 is a group R11 selected from: alkyl comprising a tertiary carbon atom directly bound to a carbon atom of the cyclobutene ring of formula (I); branched alkyl wherein a secondary or tertiary carbon atom of the branched alkyl is spaced from a carbon atom of the cyclobutene ring of formula (I) by at least one &#x2014;CH&#x2014; group; and alkyl comprising a cyclic alkyl group; or with the proviso that at least two Rgroups are linked to form a ring.

Hole transporting cyclobutene compound

The present invention relates to a compound of general formula (I) which can transport holes in an organic optoelectronic device, and to blends and solutions comprising the compound of general formula (I):  

Compound

An organic semiconducting compound comprising the structure of formula (I): 

Organic semiconductors

A semiconducting compound with the structure: 

A semiconducting compound comprising the structure: 

A soluble oligomeric compound for forming an organic thin film transistor, has repeat units comprising two or more fused thiophene residues. The repeat units comprise the structure:  The compound may include two or more terminating groups comprising solvating groups. A solution of the material can be used to form a thin film transistor by ink jet printing.

The invention provides a color photographic element comprising at least one light-sensitive silver halide emulsion layer or a non silver-containing light-insensitive layer, in which at least one of these layers contains a colorless imidazole compound of formula (I) that undergoes less than 10% chemical or redox reaction with oxidized developer and which enables the photographic speed of the element to be increased by at least 0.05 stop without increasing granularity, compared to the same element without the compound, wherein the compound of formula (I) has the structure: wherein

Photographic element containing a speed-enhancing compound

The invention provides a color photographic element comprising at least one light-sensitive silver halide emulsion layer or a non silver-containing light-insensitive layer, in which at least one of these layers contains a colorless heterocyclic compound having either one or two hetero atoms in the ring or ring system, being other than an imidazole compound, that undergoes less than 10% chemical or redox reaction directly with oxidized developer and which has a partition coefficient to enable the photographic speed of the element to be increased by at least 0.03 stop without increasing granularity, compared to the same element without the compound. The heterocyclic compounds increase speed without a concomitant increase in size of the light-sensitive silver halide grains.

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Tania Zuberi