Organic electroluminescent device, useful e.g. in organic transistors and integrated circuits, comprises electrodes, doped emission layer and a hole-blocking layer containing a spiro-bifluorene compound

摘要

Organic electroluminescent device (A) comprises an anode; a cathode; and at least one emission layer, comprising a matrix material doped with a phosphorescence emitter. The new feature is that between the cathode and emission layer there is a hole-blocking layer that includes at least one spiro-fluorene (1). Organic electroluminescent device (A) comprises an anode; a cathode; and at least one emission layer, comprising a matrix material doped with a phosphorescence emitter. The new feature is that between the cathode and emission layer there is a hole-blocking layer that includes at least one spiro-fluorene of formula (1) [Image](1) Aryl : (hetero)aromatic ring system of 1-40 aromatic C atoms, optionally substituted by one or more R; R : hydrogen, fluoro, chloro, iodo, nitro, cyano or 1-40C linear, branched or cyclic alkyl, where one or more non-adjacent CH 2can be replaced by -CR 1=CR 1-, ethynylene, Si(R 1) 2, Ge(R 1) 2, Sn(R 1) 2, oxygen, sulfur or NR 1, and one or more H can be replaced by fluoro or aromatic group R 1, and two or more R, or R with Aryl, may form a further mono- or poly-cyclic, aliphatic or aromatic ring system; each R 1hydrogen, 1-20C aliphatic or aromatic hydrocarbyl, and two or more R, or R with Aryl, may form a further mono- or poly-cyclic, aliphatic or aromatic ring system; n : 1-4; m and p : 0-4; o : 0-3; provisos: n + o and m + p : 4; the hole-blocking layer is not identical with the matrix material and Aryl is not a di-, tri- or tetr-azine group.