Light-emitting device, light-emitting apparatus, light-emitting module, electronic device, and lighting device

A light-emitting device comprising:

• a first electrode;
• a first layer over the first electrode;
• a second layer over the first layer;
• a light-emitting layer over the second layer;
• and
• a second electrode over the light-emitting layer,
• wherein the first layer comprises a first organic compound,
• wherein the second layer comprises a second organic compound,
• wherein a glass transition temperature of the first organic compound is higher than or equal to 90° C.,
• wherein a refractive index of a layer comprising the first organic compound with respect to light with a wavelength of 633 nm is higher than or equal to 1.45 and lower than or equal to 1.70, and
• wherein the second organic compound comprises fluorine.

A light-emitting device comprising:

• a first electrode;
• a first layer over the first electrode;
• a second layer over the first layer;
• a light-emitting layer over the second layer;
• and
• a second electrode over the light-emitting layer,
• wherein the first layer comprises a first organic compound,
• wherein the second layer comprises a second organic compound,
• wherein the first organic compound is a monoamine compound,
• wherein a refractive index of a layer comprising the first organic compound with respect to light with a wavelength of 633 nm is higher than or equal to 1.45 and lower than or equal to 1.70, and
• wherein the second organic compound comprises fluorine.

A light-emitting device comprising:

• a first electrode;
• a first layer over the first electrode;
• a second layer over the first layer;
• a third layer over the second layer;
• a light-emitting layer over the third layer;
• and
• a second electrode over the light-emitting layer,
• wherein the first layer comprises a first organic compound,
• wherein the second layer comprises a second organic compound,
• wherein the third layer comprises a third organic compound,
• wherein a HOMO level of the third organic compound is lower than a HOMO level of the first organic compound,
• wherein a refractive index of a layer comprising the first organic compound is lower than a refractive index of a layer comprising the third organic compound, and
• wherein the second organic compound comprises fluorine.