| abstract |
The present invention relates to the formula (I) or formula (III) as a host for phosphorescent emitters, electron transport materials or emitter materials, in particular where Y 1 , Y 2 , Y 3 , Y 4 , X 1 , X 2 and X 3 are each independently N or CR 4 , but at least one of the groups X 1 , X 2 and X 3 is a group CR 4 , and 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 one of the substituents R 1 , R 1 ′ and R 4. Together form an optionally substituted aromatic or heteroaromatic ring or ring system adjacent to each other, m is an integer from 1 to 6, and R 100 , R 101 and R 102 are , independently of one another, optionally substituted C 1 may -C 8 alkyl group, C 6 -C 24 aryl group Or a C 7 -C 12 aralkyl groups, Q is a linking group; in the compound of formula (III), the Azapiren of said at least 1 Tsugamoto Q of the substituents R 1 or R 4] The present invention relates to electronic devices including, in particular, electroluminescent devices. The host can function with a phosphorescent material to provide improved efficiency, stability, manufacturability or spectroscopic properties of the electroluminescent device. |