Light-emitting dendrimers

A semiconducting device, other than a light emitting device, selected from the group consisting of photodiodes, solar cells, FETs, and solid state triodes, wherein the semiconducting device comprises a compound having the following formula:

• CORE−[DENDRITE]n
• in which CORE represents an atom or group , n represents an integer of at least 1 and DENDRITE, which may be the same or different if n is greater than 1, represents an at least partly conjugated dendritic molecular structure comprising groups selected from the group consisting of aryl and heteroaryl groups and alkenyl groups connected to each other via a carbon atom of an alkenyl group to a ring carbon atom of an aryl or heteroaryl group, CORE terminating in a first single bond which is connected to a ring carbon atom of an (hetero)aryl group to which more than one at least partly conjugated dendritic chain is attached, said ring carbon atom of an (hetero)aryl group forming part of DENDRITE, the CORE and/or DENDRITE being luminescent;
• wherein:
• (i) the CORE is not
• wherein x is bromine or CHO when n=2,
• (ii) the CORE is not bromine or CHO when n=1 and is attached to
• and (iii) the CORE does not contain the structure
• øt-[—CH═CH-øp-CH═CH—]3
• in which øt is a 1,3,5-bonded benzene ring and øp is para-bonded benzene ring.

A film formed of a compound having the following formula:

• CORE−[DENDRITE]n
• in which CORE represents an atom or group, n represents an integer of at least 1 and DENDRITE, which may be the same or different if n is greater than 1, represents an at least partly conjugated dendritic molecular structure comprising groups selected from the group consisting of aryl and heteroaryl groups and alkenyl groups connected to each other via a carbon atom of an alkenyl group to a ring carbon atom of an aryl or heteroaryl group, CORE terminating in a first single bond which is connected to a ring carbon of an (hetero)aryl group to which more than one at least partly conjugated dendritic chain is attached, said ring carbon atom of an (hetero)aryl group forming part of DENDRITE, the CORE and/or DENDRITE being luminescent;
• wherein:
• (i) the CORE is not
• wherein x is bromine or CHO when n=2,
• (ii) the CORE is not bromine or CHO when n=1 and is attached to
• and (iii) the CORE does not contain the structure
• ti øt-[—CH═CH-øp-CH═CH—]3
• in which øt is a 1,3,5-bonded benzene ring and øp is a para-bonded benzene ring.