Synthesis and electroluminescence properties of highly efficient blue fluorescence emitters using dual core chromophores

We describe two novel blue emission materials based on a new type of dual core concept. 1-Phenyl-6-(10-phenyl-anthracen-9-yl)-pyrene (Ph-AP-Ph) and 1-[1,1'; 3',1'']terphenyl-5'-yl-6 -(10-[1,1'; 3',1'']terphenyl-5'-yl -anthracen-9-yl)-pyrene (TP-AP-TP) were synthesized through boronylation and Suzuki coupling reactions. The T sub(g) values of Ph-AP-Ph and TP-AP-TP were 228 degree C and 243 degree C, respectively, compared to values of 135 degree C and 139 degree C for the single core materials 9-(3',5'-diphenylphenyl)-10-(3''',5'''-diphenylbiphenyl-4''-yl)an thracene (MAM) and 1,6-bis-[1,1'; 3',1'']terphenyl-5'-yl-pyrene (TP-P-TP). One of the dual core derivatives, TP-AP-TP, exhibited an EL sub(max) value of 456 nm and a high luminance EQE of 7.51% when used in an EL device. The dual core chromophore materials had narrower PL and EL spectra and better thermal properties than the single core chromophore materials. A device based on TP-AP-TP showed twice the lifetime of a device based on the commercialized material, 2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN).