| abstract |
The present invention relates to electronic devices, especially electroluminescent devices, comprising azapyrenes of formula (I), or formula (III), wherein Y 1 , Y 2 , Y 3 , Y 4 , X 1 , X 2 and X 3 are independently each other 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 hydrogen, F, -SiR 100 R 101 R 102 , or an organic substituent, or any of the substituents R 1 , R 1' and R 4 , which are adjacent to each other, together form an aromatic, or heteroaromatic ring, or ring system, which can optionally be substituted, m is an integer of 1 to 6, and R 100 , R 101 and R 102 are independently of each other a C 1 -C 8 alkyl group, a C 6 -C 24 aryl group, or a C 7 -C 12 aralkylgroup, which may optionally be substituted, and Q is a linking group; with the proviso that in the compound of formula (III) at least one of the substituents R 1 , or R 4 is a group Q; especially as host for phosphorescent emitters, electron transporting materials, or emitter materials. The hosts may function with phosphorescent materials to provide improved efficiency, stability, manufacturability, or spectral characteristics of electroluminescent devices. |