Material for hole injection transport layers, ink for forming hole injection transport layers, device, and production methods thereof

A method for producing a material for hole injection transport layers, comprising steps of:

• obtaining a reaction product by heating a mixture of a molybdenum complex and a compound represented by the following chemical formula (1);
• and removing the compound remaining unreacted from a reaction solution:
• wherein R1 and R2 each independently represent a hydrocarbon group which can have a substituent or contain a heteroatom;
• X1 and X2 each independently represent an oxygen atom, sulfur atom or direct bond;
• and a total of carbon numbers of R1 and R2 is 5 or more.

A method for producing an ink for forming hole injection transport layers, comprising a step of dissolving a material for hole injection transport layers which is a reaction product of a molybdenum complex with a compound represented by the following chemical formula (1):

• wherein R1 and R2 each independently represent a hydrocarbon group which can have a substituent or contain a heteroatom;
• X1 and X2 each independently represent an oxygen atom, sulfur atom or direct bond;
• and a total of carbon numbers of R1 and R2 is 5 or more, in an aromatic hydrocarbon solvent, or dissolving in an aromatic hydrocarbon solvent the material for hole injection transport layers obtained by the method comprising the steps of:
• obtaining a reaction product by heating a mixture of the molybdenum complex and the compound represented by chemical formula (1);
• and removing the compound remaining unreacted from a reaction solution.