Patent ID: 11283036

Abstract:
This organic electroluminescent element comprises a light emission unit between a first electrode and a second electrode, wherein the relational expression nEML>nETL is satisfied in a light emission layer of the light emission unit that is closest to the first electrode, when a maximum emission wavelength (λmax) is the wavelength at which an emission intensity (PINT(λ)) that includes spectral luminous efficiency is maximized, said emission intensity (PINT(λ)) that includes spectral luminous efficiency being calculated from formula (1), nEML is the refractive index of the light emission layer at the maximum emission wavelength (λmax), and nETL is the refractive index of an electron transport layer. Formula (1): PINT(λ)=P(λ)×V(λ) (Where PINT(λ): emission intensity that includes spectral luminous efficiency, P(λ): emission intensity, and V(λ): spectral luminous efficiency are all functions of the wavelength λ.)