COMPOSITION INCLUDING PHOSPHORESCENCE-EMITTING COMPOUND, AND LIGHT EMITTING-ELEMENT USING THE COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a light-emitting material enabling a light-emitting element using it to have superior light emission efficiency.

SOLUTION: The composition contains: a phosphorescence-emitting compound; and a compound having a structure, including three repeating units or more with dipole moment values of 1.0 Debye or larger which are bonded in succession. With respect to the total number of dimer structures included in the structure, each consisting of arbitrary two repeating units bonded in succession, the ratio of a number of dimer structures satisfies the relation represented by expression (A): D1a2and D1b2, where D2is the dipole moment values of the dimer structures, D1aare the dipole moment values of first repeating units composing the dimer structures and D1bare the dipole moment values of second repeating units composing the dimer structures and are 50% or larger.

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