Light-emitting device, display apparatus, light- emitting apparatus, electronic appliance, and lighting apparatus

A light-emitting device comprising:

• a first electrode;
• a second electrode;
• and
• an EL layer between the first electrode and the second electrode, the EL layer comprising a high refractive index layer, a low refractive index layer, and a light-emitting layer,
• wherein the low refractive index layer comprises a first organic compound,
• wherein the high refractive index layer comprises a second organic compound,
• wherein the first organic compound has an ordinary refractive index greater than or equal to 1.50 and less than or equal to 1.75 with respect to light at 455 nm to 465 nm, or an ordinary refractive index greater than or equal to 1.45 and less than or equal to 1.70 with respect to light at 633 nm,
• wherein the light-emitting layer comprises a light-emitting substance,
• wherein given that a wavelength corresponding to an intensity 1/e times a maximum peak intensity in an emission spectrum of the light-emitting substance is λn, a shortest λn in a range of wavelengths longer than a maximum peak wavelength λmax of the light-emitting substance is λ1, and a longest λn in a range of wavelengths shorter than λmax is λ2, an energy at a wavelength corresponding to a difference between λ1 and λ2 is greater than or equal to 0.03 eV and less than or equal to 0.27 eV, and
• wherein the second organic compound has an ordinary refractive index greater than or equal to 2.00 and less than or equal to 2.50 with respect to light at 455 nm to 465 nm, or an ordinary refractive index greater than or equal to 1.95 and less than or equal to 2.45 with respect to light at 633 nm.

A light-emitting device comprising:

• a first electrode;
• a second electrode;
• and
• an EL layer between the first electrode and the second electrode, the EL layer comprising a low refractive index layer and a light-emitting layer,
• wherein the low refractive index layer comprises a first organic compound,
• wherein the first organic compound has an ordinary refractive index greater than or equal to 1.50 and less than or equal to 1.75 with respect to light at 455 nm to 465 nm, and an ordinary refractive index greater than or equal to 1.45 and less than or equal to 1.70 with respect to light at 633 nm,
• wherein the light-emitting layer comprises a light-emitting substance,
• wherein the light-emitting substance comprises a condensed heteroaromatic ring comprising nitrogen in a molecular structure,
• wherein the condensed heteroaromatic ring comprising nitrogen is a condensed ring with four or more rings, and
• wherein the condensed heteroaromatic ring comprising nitrogen comprises an indolocarbazole skeleton.