Patent ID: 8373159
Filing Date: 2013-02-12
Classification: H01L

Abstract:
1. An organic light-emitting diode comprising an anode An, a cathode Ka, and a light-emitting layer E which is arranged between the anode An and the cathode Ka and comprises at least one carbene complex represented by the formula I: wherein M carbene is a carbene ligand which may be uncharged or monoanionic and mono-, bi- or tridentate; the carbene ligand may be a bis- or triscarbene ligand; L is a mono- or dianionic ligand which may be mono- or bidentate; K is an uncharged mono- or bidentate ligand; n is the number of carbene ligands, where n is at least 1 and the carbene ligands in the complex represented by the formula I, when n>1, may be the same or different; m is the number of ligands L, where m may be 0 or ≧1, and the ligands L, when m>1, may be the same or different; o is the number of ligands K, where o may be 0 or ≧1, and the ligands K, when o>1, may be the same or different; p is the charge of the complex: 0, 1, 2, 3 or 4; W is a monoanionic counterion; where the sum of n+m+o and the charge p depend on the oxidation state and a coordination number of the metal atom, on the charge of the complex and on the denticity of the carbene, L and K ligands, and on the charge of the carbene and L ligands, with the proviso that n is at least 1; and optionally, at least one further layer, wherein the organic light-emitting diode comprises at least one compound represented by the formula II which is present in the light-emitting layer E or in the at least one further layer, or both, wherein X is NR R R wherein R R q, r are each independently 0, 1, 2 or 3; where, when q or r is 0, all substitutable positions of the aryl radical are substituted by hydrogen, wherein the radicals and the indices in the group represented by the formula (c) X′″, R