Patent ID: 9028979
Filing Date: 2015-05-12
Classification: C07D,H01L,Y10S

Abstract:
1. An electroluminescent (EL) device, comprising (a) an anode, (b) a hole transporting/injecting layer, (c) optionally an electron blocking layer, (d) a light-emitting layer, (e) optionally a hole- or exciton-blocking layer, (f) an electron-transporting layer, and (g) a cathode, wherein: the hole transporting/injecting layer, (b) the electron blocking layer (c), or both layers of (b) and (c), comprises a compound of the formula (I) R R R R R A or A 1 and A 1′ , A 2 and A 2′ , or both A 1 and A 1′ and A 2 and A 2′ , together with the nitrogen atom to which they are bonded form a heteroaromatic ring, or ring system; R two or more groups R R R R R substituents R R R R R D is —CO—, —COO—, —S—, —SO—, —SO E is —OR G is E, C R R R R R R R