Abstract: Provided is a composition for manufacturing an organic semiconductor device, the composition enabling formation of an organic semiconductor device that stably shows high carrier mobility. A composition for manufacturing an organic semiconductor device contains 2,3-dihydrobenzofuran as a solvent and an organic semiconductor material below, in which the water content of the solvent is 0.25 wt % or less. The organic semiconductor material: at least one compound selected from the group consisting of a compound represented by formula (1-1), a compound represented by formula (1-2), a compound represented by formula (1-3), a compound represented by formula (1-4), a compound represented by formula (1-5), and a compound represented by formula (1-6).

Abstract: Ink compositions for forming active layers in an organic light-emitting diode are provided. Also provided are methods of forming active layers of an OLED using the ink compositions. The ink compositions comprise a solvent system in which a substantial majority of the solvent is comprised of one or more ester compounds.

Abstract: In accordance with the invention, a composition including a solvent and a functional material is prepared. The solvent includes at least one heterocyclic compound having one or more substituents and containing an oxygen atom as a constituent atom. The functional material is selected from a group including organic EL materials, conductive materials, insulative materials and semiconductive materials. Functional films and functional elements are prepared by using the composition.