POLYMERIC MATERIAL AND ELEMENT EMPLOYING THE SAME

摘要

A polymeric material which comprises either a composition comprising a fluorescent conjugated polymer (A) and a phosphorescent compound (B) or a polymer having the structure of the polymer (A) and the structure of the compound (B) in the same molecule, characterized by satisfying the following requirements (1), (2), and (3). (1) The fluorescent conjugated polymer (A) has one or more luminescent peaks at wavelengths at least one of which is shorter than 500 nm. (2) The phosphorescent compound (B) has a luminescent peak at a wavelength of 500 nm or longer. (3) The ingredients (A) and (B) satisfy the following relationship: ETA-ESA0 >= (ETB-ESB0)-0.2 (unit: eV) (Eq. 1) (wherein ESA0 represents the energy of the fluorescent conjugated polymer (A) in the ground state; ETA represents the energy of the fluorescent conjugated polymer (A) in the minimum excited triplet state; ESB0 represents the energy of the phosphorescent compound (B) in the ground state; and ETB represents the energy of the phosphorescent compound (B) in the minimum excited triplet state).