Organic electroluminescent device comprising an anode, a cathode, at least one emission layer and an organic semiconducting layer; wherein the organic semiconducting layer is arranged between the at least one emission layer and the cathode; wherein the organic semiconducting layer comprises: a) a first organic compound comprising a first C 10 to C 42 arene structural moiety and/or a first C 2 to C 42 heteroarene structural moiety, wherein i) the dipole moment of the first organic compound, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is from 0 to 2.5 Debye; and ii) the LUMO energy level of the first organic compound in the absolute scale taking vacuum energy level as zero, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is in the range from -1.7 eV to -2.1 eV; and b) a second organic compound comprising a second C 10 to C 42 arene structural moiety and/or a second C 2 to C 42 heteroarene structural moiety and in addition at least one polar group selected from phosphine oxide and phosphine sulfide, wherein iii) the dipole moment of the second organic compound, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is from 1.5 to 10 Debye; and iv) the LUMO energy level of the second organic compound in the absolute scale taking vacuum energy level as zero is less than 0.25 eV higher or lower than the LUMO energy level of the first organic compound; wherein it is provided that the first organic compound and the second organic compound are different from each other. emission layer and an organic semiconducting layer; wherein the organic semiconducting layer is arranged between the at least one emission layer and the cathode; wherein the organic semiconducting layer comprises: a) a first organic compound comprising a first C 10 to C 42 arene structural moiety and/or a first C 2 to C 42 heteroarene structural moiety, wherein i) the dipole moment of the first organic compound, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is from 0 to 2.5 Debye; and ii) the LUMO energy level of the first organic compound in the absolute scale taking vacuum energy level as zero, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is in the range from -1.7 eV to -2.1 eV; and b) a second organic compound comprising a second C 10 to C 42 arene structural moiety and/or a second C 2 to C 42 heteroarene structural moiety and in addition at least one polar group selected from phosphine oxide and phosphine sulfide, wherein iii) the dipole moment of the second organic compound, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is from 1.5 to 10 Debye; and iv) the LUMO energy level of the second organic compound in the absolute scale taking vacuum energy level as zero is less than 0.25 eV higher or lower than the LUMO energy level of the first organic compound; a) a first organic compound comprising a first C 10 to C 42 arene structural moiety and/or a first C 2 to C 42 heteroarene structural moiety, wherein i) the dipole moment of the first organic compound, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is from 0 to 2.5 Debye; and ii) the LUMO energy level of the first organic compound in the absolute scale taking vacuum energy level as zero, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is in the range from -1.7 eV to -2.1 eV; and i) the dipole moment of the first organic compound, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is from 0 to 2.5 Debye; and ii) the LUMO energy level of the first organic compound in the absolute scale taking vacuum energy level as zero, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is in the range from -1.7 eV to -2.1 eV; and b) a second organic compound comprising a second C 10 to C 42 arene structural moiety and/or a second C 2 to C 42 heteroarene structural moiety and in addition at least one polar group selected from phosphine oxide and phosphine sulfide, wherein iii) the dipole moment of the second organic compound, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is from 1.5 to 10 Debye; and iv) the LUMO energy level of the second organic compound in the absolute scale taking vacuum energy level as zero is less than 0.25 eV higher or lower than the LUMO energy level of the first organic compound; iii) the dipole moment of the second organic compound, computed by the TURBOMOLE V6.5 program package using hybrid functional B3LYP and Gaussian 6-31G ∗ basis set, is from 1.5 to 10 Debye; and iv) the LUMO energy level of the second organic compound in the absolute scale taking vacuum energy level as zero is less than 0.25 eV higher or lower than the LUMO energy level of the first organic compound; wherein it is provided that the first organic compound and the second organic compound are different from each other.