ORGANIC EL ELEMENT, AND LIGHT EMITTING APPARATUS, IMAGE-FORMING APPARATUS, DISPLAY APPARATUS AND IMAGING APPARATUS EACH INCLUDING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an organic EL element improved in luminous efficiency by suppressing the loss of excitation energy due to a surface plasmon generated at an electrode surface.SOLUTION: A hole transport layer 3 located between a light emitting layer 5 and a reflection electrode 2, and an electron injection layer 7 in contact with the light emitting layer 5 and a transparent electrode 8 made of light-transmissive metal are formed of a material having a refractive index of 1.20 or more and 1.65 or less at a maximum peak wavelength of a spectrum of light emitted by the light emitting layer 5.