Patent ID: 6720093
Filing Date: 2004-04-13
Classification: C08G,C08J,C09K,E01C,H01L,Y02E,Y02P,Y10S,Y10T

Abstract:
A light emitting device incorporating as, or in, its light-emitting element a compound having the formula:COREâˆ’[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: (a) the CORE is not â€ƒwherein x is bromine or CHO when n=2, (b) the CORE is not bromine or CHO when n=1 and is attached to â€ƒand (c) the CORE does not contain the structure Ã¸t-[â€”CH&boxH;CH-Ã¸p-CH&boxH;CHâ€”]3 in which Ã¸t is a 1,3,5-bonded benzene ring and Ã¸p is a para-bonded benzene ring.