| abstract |
The present invention relates to electronic devices, especially electroluminescent devices, which comprise azapyrene of formula (I) or formula (III), wherein Y 1 , Y 2 , Y 3 , Y 4 , X 1 , X 2 and X 3 independently of one another N or CR 4 , with the proviso that at least one of the groups X 1 , X 2 and X 3 is a group CR 4 , R 1 is hydrogen, F, ‑SiR 100 R 101 R 102 or an organic substituent, R 4 is any one of hydrogen, F, -SiR 100 R 101 R 102 or organic substituents or substituents R 1 , R 1' and R 4 which are adjacent to each other and together form an aromatic ring or hetero Aromatic rings or ring systems, which may be optionally substituted, m is an integer of 1-6, and R 100 , R 101 and R 102 are independently C 1 -C 8 alkyl, C 6 -C 24 aromatic or C 7 -C 12 aralkyl, which may be optionally substituted, and Q is a linking group; provided that in the compound of formula (III), at least one of the substituents R 1' or R 4 is Group Q; especially as host for phosphorescent emitters, electron-transport materials or emissive materials. The host can act in conjunction with the phosphorescent material to provide improved efficiency, stability, manufacturability or spectral characteristics to the electroluminescent device. |