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 that is excellent in electric characteristics and device lifetime and in which the emission intensity of the maximum value of the emission spectrum in a visible light region is sufficiently small or the maximum value in the visible light region is not found, 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 energy levels of LUMO and HOMO of the delayed fluorescent substance and the luminescent substance and the absorption spectrum of the luminescent substance and the emission spectrum of the delayed fluorescent substance satisfy a predetermined relationship, 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、電気特性及びデバイス寿命に優れ、且つ可視光領域における発光スペクトルの極大値の発光強度が十分に小さい、又は可視光領域における極大値が観察されない有機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のLUMO、HOMOのエネルギー準位並びに発光体の吸収スペクトル及び遅延蛍光体の発光スペクトルは所定の関係を満たす、近赤外領域に発光ピークを有する有機EL素子。【選択図】図1
