A mixture comprising three or more organic compounds, wherein a molecular weight difference between any two organic compounds is less than 160 Dalton, in the mixture, a molar content of each organic compound is no less than 3% and no more than 90%, and all of the organic compounds have at least one identical or similar optoelectronic function, characterized in that all of the organic compound are selected from the group consisting of the following general formulas: and wherein Ar 1 and Ar 2 are each independently selected from the group consisting of an aryl group containing 6 to 60 carbon atoms, and a heteroaryl group containing 3 to 60 carbon atoms Ar 9 and Ar 10 are each independently selected from the group consisting of H, D, F, CN, NO 2, CF 3, alkenyl, alkynyl, amino, acyl, amide, cyano, isocyano, alkoxy, hydroxy, carbonyl, sulfonyl, an alkyl group containing 1 to 60 carbon atoms, a cycloalkyl group containing 3 to 60 carbon atoms, an aryl group containing 6 to 60 carbon atoms, and a heteroaromatic ring group containing 3 to 60 carbon atoms; L 1 is one selected from an aryl group containing 5 to 60 ring atoms and an heteroaryl group containing 5 to 60 ring atoms; -L 2 - is a single bond, or L 2 is one selected from an aryl group containing 5 to 30 ring atoms and a heteroaryl group containing 5 to 30 ring atoms; Ar 3, Ar 4, Ar 5, Ar 6, Ar 7 and Ar 8 are each independently selected from an aryl group containing 5 to 30 ring atoms and a heteroaryl group containing 5 to 30 ring atoms; -X 1 - is a single bond, or X 1 is one selected from the group consisting of N, C 2, Si 2, O, C=N, C=C 2, P, P(=O)R, S, S=O or SO 2; -X 2 -, -X 3 -, -X 4 -, -X 5 -, -X 6 -, -X 7 -, -X 8 - and -X 9 - are each a single bond, or X 2, X 3, X 4, X 5, X 6, X 7, X 8 and X 9 are each independently selected from the group consisting of N, C 2, Si 2, O, C=N, C=C 2, P, P(=O)R, S, S=O or SO 2, wherein -X 2 - and -X 3 -are not single bonds simultaneously, -X 4 - and -X 5 - are not single bonds simultaneously, -X 6 - and -X 7 - are not single bonds simultaneously, and -X 8 - and -X 9 - are not single bonds simultaneously; R 1, R 2 and R are each independently selected from the group consisting of H, D, F, CN, alkenyl, alkynyl, nitrile, amine, nitro, acyl, alkoxy, carbonyl, sulfonyl, an alkyl containing 1 to 30 carbon atoms, a cycloalkyl containing 3 to 30 carbon atoms, an aromatic hydrocarbyl group containing 5 to 60 ring atoms and an heteroaromatic ring group containing 5 to 60 carbon atoms; m is any integer from 0 to 4, o is any integer from 0 to 4, p is any integer from 0 to 6, and n is any integer from 1 to 4. wherein Ar 1 and Ar 2 are each independently selected from the group consisting of an aryl group containing 6 to 60 carbon atoms, and a heteroaryl group containing 3 to 60 carbon atoms Ar 9 and Ar 10 are each independently selected from the group consisting of H, D, F, CN, NO 2, CF 3, alkenyl, alkynyl, amino, acyl, amide, cyano, isocyano, alkoxy, hydroxy, carbonyl, sulfonyl, an alkyl group containing 1 to 60 carbon atoms, a cycloalkyl group containing 3 to 60 carbon atoms, an aryl group containing 6 to 60 carbon atoms, and a heteroaromatic ring group containing 3 to 60 carbon atoms; L 1 is one selected from an aryl group containing 5 to 60 ring atoms and an heteroaryl group containing 5 to 60 ring atoms; -L 2 - is a single bond, or L 2 is one selected from an aryl group containing 5 to 30 ring atoms and a heteroaryl group containing 5 to 30 ring atoms; Ar 3, Ar 4, Ar 5, Ar 6, Ar 7 and Ar 8 are each independently selected from an aryl group containing 5 to 30 ring atoms and a heteroaryl group containing 5 to 30 ring atoms; -X 1 - is a single bond, or X 1 is one selected from the group consisting of N, C 2, Si 2, O, C=N, C=C 2, P, P(=O)R, S, S=O or SO 2; -X 2 -, -X 3 -, -X 4 -, -X 5 -, -X 6 -, -X 7 -, -X 8 - and -X 9 - are each a single bond, or X 2, X 3, X 4, X 5, X 6, X 7, X 8 and X 9 are each independently selected from the group consisting of N, C 2, Si 2, O, C=N, C=C 2, P, P(=O)R, S, S=O or SO 2, wherein -X 2 - and -X 3 -are not single bonds simultaneously, -X 4 - and -X 5 - are not single bonds simultaneously, -X 6 - and -X 7 - are not single bonds simultaneously, and -X 8 - and -X 9 - are not single bonds simultaneously; R 1, R 2 and R are each independently selected from the group consisting of H, D, F, CN, alkenyl, alkynyl, nitrile, amine, nitro, acyl, alkoxy, carbonyl, sulfonyl, an alkyl containing 1 to 30 carbon atoms, a cycloalkyl containing 3 to 30 carbon atoms, an aromatic hydrocarbyl group containing 5 to 60 ring atoms and an heteroaromatic ring group containing 5 to 60 carbon atoms; m is any integer from 0 to 4, o is any integer from 0 to 4, p is any integer from 0 to 6, and n is any integer from 1 to 4.