Light emitting diode

A light-emitting diode comprising:

• a first electrode;
• a second electrode overlapping the first electrode;
• an emission layer positioned between the first electrode and the second electrode;
• a first capping layer positioned on the first electrode;
• and
• a second capping layer positioned between the first capping layer and the first electrode,
• wherein the first capping layer includes at least one among LiF, MgF2, AlF3, NaF, and AlOx,
• wherein reflectance for a 550 nm green wavelength is reduced to be less than 0.1 at an interface between the first electrode and the second capping layer by controlling a thickness of the second capping layer less than 65 nm thereby distributing a white angular dependency (WAD) distribution in a blue region of a color coordinate system.

A light-emitting diode comprising:

• a first electrode;
• a second electrode overlapping the first electrode;
• an emission layer positioned between the first electrode and the second electrode;
• and
• a capping layer positioned on the first electrode,
• wherein a refractive index of the capping layer is 1.1 to 1.4, and
• wherein reflectance for a 550 nm green wavelength is reduced to be less than 0.1 at an interface between the first electrode and the capping layer by controlling a thickness of a first portion of the capping layer between 30 nm and 40 nm thereby distributing a white angular dependency (WAD) distribution in a blue region of a color coordinate system.

A light-emitting diode comprising:

• a first electrode;
• a second electrode overlapping the first electrode;
• an emission layer positioned between the first electrode and the second electrode;
• a first capping layer positioned on the first electrode, and
• a second capping layer positioned between the first electrode and the first capping layer,
• wherein the first capping layer includes at least one among LiF, MgF2, AlF3, NaF, and AlOx,
• wherein the thickness of the second capping layer is greater than the thickness of the first capping layer, and
• wherein reflectance for a 550 nm green wavelength is reduced to be less than 0.1 at an interface between the first electrode and the second capping layer by controlling a thickness of the first capping layer between 30 nm and 40 nm and a thickness of the second capping layer less than 65 nm thereby distributing a white angular dependency (WAD) distribution in a blue region of a color coordinate system.

A light-emitting diode comprising:

• a first electrode;
• a second electrode overlapping the first electrode;
• an emission layer positioned between the first electrode and the second electrode;
• a first capping layer positioned on the first electrode;
• and
• a second capping layer positioned between the first capping layer and the first electrode,
• wherein the first capping layer includes at least one among LiF, MgF2, AlF3, NaF, and AlOx,
• wherein a thickness of the second capping layer is less than 65 nm,
• wherein the second capping layer is at least one among SiO2, SiNx, ZnS, PA, PI, TeO2, WO3, V2O5, AlxOy, ZnSe, a triamine derivative, an arylene diamine derivative, CBP, and tris(8-hydroxy-quinolinato)aluminum (Alq3),
• wherein the thickness of the second capping layer is greater than the thickness of the first capping layer, and
• wherein reflectance for a 550 nm green wavelength is reduced to be less than 0.1 at an interface between the first electrode and the second capping layer by controlling a thickness of the first capping layer between 30 nm and 40 nm thereby distributing a white angular dependency (WAD) distribution in a blue region of a color coordinate system.

A light-emitting diode comprising:

• a first electrode;
• a second electrode overlapping the first electrode;
• an emission layer positioned between the first electrode and the second electrode;
• a first capping layer positioned on the first electrode;
• and
• a second capping layer positioned between the first electrode and the first capping layer,
• wherein a refractive index of the first capping layer is 1.1 to 1.4,
• wherein the thickness of the second capping layer is greater than the thickness of the first capping layer, and
• wherein reflectance for a 550 nm green wavelength is reduced to be less than 0.1 at an interface between the first electrode and the second capping layer by controlling a thickness of the first capping layer between 30 nm and 40 nm and a thickness of the second capping layer less than 65 nm thereby distributing a white angular dependency (WAD) distribution in a blue region of a color coordinate system.