Light emitting device
View Patent ↗A light emitting device includes a plurality of types of light emitting elements including at least a red light emitting element that outputs red light, a green light emitting element that outputs green light, and a blue light emitting element that outputs blue light. Each of the plurality of types of the light emitting elements includes a first electrode, a second electrode that is disposed on a side for outputting light and has semi-transmissive reflectivity or transparency, a function layer that is formed between the first electrode and the second electrode and includes at least a light emitting layer, a reflective layer that additionally serves as the first electrode or is formed separately from the first electrode in a position for facing the function layer through the first electrode and reflects light generated in the light emitting layer to the second electrode side, and a color filter that is disposed in a position for facing the reflective layer through the function layer and absorbs light having wavelengths in a wavelength range other than a wavelength range of the output light. In addition, at least one type of the light emitting element of the plurality of types of the light emitting elements further includes a semi-reflective layer that is disposed between the reflective layer and the function layer and a transparent layer that is disposed between the reflective layer and the semi-reflective layer.
1. A light emitting device comprising a first light emitting element and a second light emitting element above a substrate,
the first light emitting element and the second light emitting element each including:
a first electrode above the substrate;
a second electrode having transparency or semi-transmissive reflectivity;
a light emitting layer disposed between the first electrode and the second electrode;
a reflective layer that reflects light emitted by the light emitting layer to the second electrode side and is disposed between the substrate and the first electrode; and
a color filter that absorbs light having wavelengths in a wavelength range other than a wavelength range of the output light and is disposed above the second electrode, and
the first light emitting element having a semi-reflective layer that is disposed between the reflective layer and the first electrode and a transparent layer that is disposed between the reflective layer and the semi-reflective layer, the second light emitting element having the transparent layer but not having the semi-reflective layer, the transparent layer being formed of a same material in each of the first and second light emitting elements; and
a microcavity structure being formed in each of the first and second light emitting elements.
2. The light emitting device according to claim 1 ,
wherein the first electrode is formed of a transparent conductive material.
3. The light emitting device according to claim 1 ,
wherein the first light emitting element is a green light emitting element that emits green light.
4. The light emitting device according to claim 1 ,
wherein the second light emitting element is a red light emitting element that emits red light.
5. The light emitting device according to claim 1 ,
wherein the transparent layer includes a transparent insulating material layer and a transparent conductive material layer that is disposed between the transparent insulating material layer and the second electrode.
6. A light emitting device comprising a first light emitting element and a second light emitting element above a substrate,
the first light emitting element and the second light emitting element each including:
a first electrode above the substrate;
a second electrode having transparency or semi-transmissive reflectivity;
a light emitting layer disposed between the first electrode and the second electrode;
a reflective layer that reflects light emitted by the light emitting layer to the second electrode side and is disposed between the substrate and the first electrode; and
a color filter that absorbs light having wavelengths in a wavelength range other than a wavelength range of the output light and is disposed above the second electrode,
the first light emitting element having a semi-reflective layer that is disposed between the first electrode and the light emitting layer, the semi-reflective layer being a separate layer from the first electrode, the second light emitting element not having the semi-reflective layer; and
a microcavity structure being formed in each of the first and second light emitting elements.
7. A light emitting device comprising a first light emitting element and a second light emitting element above a substrate,
the first light emitting element and the second light emitting element each including:
a first electrode having transparency and disposed above the substrate;
a second electrode having reflectivity;
a light emitting layer disposed between the first electrode and the second electrode; and
a color filter that absorbs light having wavelengths in a wavelength range other than a wavelength range of the output light and is disposed between the substrate and the first electrode,
the first light emitting element having a first semi-reflective layer that is disposed between the first electrode and the color filter, a second semi-reflective layer that is disposed between the light emitting layer and the second electrode, the second semi-reflective layer being a separate layer from the second electrode, and a transparent layer that is disposed between the second electrode and the second semi-reflective layer, the second light emitting element not having the first semi-reflective layer and the second semi-reflective layer; and
a microcavity structure being formed in each of the first and second light emitting elements.
8. The light emitting device according to claim 7 ,
wherein the transparent layer is formed of a conductive material and serves as the second electrode additionally.