PROBLEM TO BE SOLVED: To provide an organic EL element that emits light in a near-infrared region of a wavelength of 700 nm or more and has high luminous efficiency and a bioinstrumentation device using the same.SOLUTION: In an organic EL element having an anode, a cathode, and at least one organic layer including a light emitting layer between the anode and the cathode, the light emitting layer includes at least a host material, a delayed fluorescent substance, and a luminescent substance, and the delayed fluorescent substance and the luminescent substance each have a structure in which 2 or 3 benzene rings are bonded to N atoms (however, two may be bonded to each other from among these benzene rings to form a condensed ring), and an emission peak is included in a near-infrared region.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】 波長700nm以上の近赤外領域で発光し、且つ発光効率が高い有機EL素子及びこれを用いた生体計測用装置を提供すること。【解決手段】 陽極、陰極、及び該陽極と該陰極との間に発光層を含む少なくとも1層の有機層を有する有機EL素子であって、発光層は、ホスト材料、遅延蛍光体及び発光体を少なくとも含み、遅延蛍光体及び発光体は、それぞれN原子に2又は3のベンゼン環が結合した構造を有する(但し、これらのベンゼン環のうち2つは結合して縮合環を形成していてもよい。)、近赤外領域に発光ピークを有する有機エレクトロルミネッセンス素子。【選択図】図1
