Composition, hole transport material composition, and ink composition

#Embodiments of the present invention relate to a composition, a hole transport material composition, and an ink composition. Further, other embodiments of the present invention relate to an organic layer that uses the composition, the hole transport material composition or the ink composition, and a method for producing the organic layer. Furthermore, other embodiments of the present invention relate to an organic electronic element and an organic electroluminescent element (hereafter also referred to as an organic EL element) that have the organic layer. Moreover, other embodiments of the present invention relate to a display element, an illumination device and a display device that use the organic EL element.

#Organic electronic elements are elements which use an organic substance to perform an electrical operation. Organic electronic elements are expected to be capable of providing advantages such as low energy consumption, low prices and superior flexibility, and are attracting considerable attention as a potential alternative technology to conventional inorganic semiconductors containing mainly silicon.

#Among organic electronic elements, organic EL elements are attracting attention for potential use in large-surface area solid state lighting applications to replace incandescent lamps and gas-filled lamps and the like. Further, organic EL elements are also attracting attention as the leading self-luminous display for replacing liquid crystal displays (LCD) in the field of flat panel displays (FPD), and commercial products are becoming increasingly available.

#FIG. 1 is a cross-sectional schematic view illustrating one example of an organic EL element according to an embodiment of the present invention.

#Embodiments of the present invention are described below.

#A composition that represents one embodiment of the present invention contains a polymer or oligomer (A) and an initiator (B). The degree of solubility of the composition is capable of being changed by applying heat, light, or both heat and light.

#The polymer or oligomer (A) (hereafter sometimes referred to as the “polymer (A)”) contains at least one type of structural unit selected from the group consisting of structural units containing an aromatic amine structure and structural units containing a carbazole structure, and contains a structural unit containing a thienyl group which may have a substituent at one or more terminals of the polymer (A). The polymer (A) contains no alkyl groups of 5 or more carbon atoms within the molecule. An “alkyl group of 5 or more carbon atoms” describes an alkyl group which contains 5 or more carbon atoms, may be linear, cyclic or branched, and has no substituents.