Electronic devices having a layer overlying an edge of a different layer and a process for forming the same
View Patent ↗An electronic device includes a radiation-emitting component, a radiation-responsive component, or a combination thereof. In one embodiment, the electronic device includes a substrate and a first structure overlying the substrate. The electronic device also includes a second structure that includes a first layer, wherein the first layer has a first refractive index, and the first layer includes a first edge. The electronic device further includes a second layer overlying at least portions of the first structure and the second structure at the first edge. The second layer has a second refractive index that is lower than the first refractive index. In another embodiment, the first structure includes a layer having a perimeter and a pattern lying within the perimeter. The pattern extends at least partly though the first layer to define an opening with a first edge. In another embodiment, a process is used to form the electronic device.
1. A process for forming an electronic device comprising:
forming a first structure over a substrate, wherein the first structure is an electrically active structure;
forming a second structure over at least portions of the first structure and the substrate, wherein:
the second structure comprises a first layer;
the first layer has a first refractive index of 1.8 to 3.0;
the first layer comprises a first edge; and
forming a second layer overlying the first structure and the second structure, wherein:
the second layer has a second refractive index of 1.4 to 1.8, wherein the refractive index of the first layer is higher than the refractive index of the second layer;
the second layer includes a first portion and a second portion;
the first portion of the second layer overlies the first structure at the first edge of the first layer and overlies the second structure; and
the second portion of the second layer overlies the first structure but not the second structure.
2. The process of claim 1 , wherein forming the second structure comprises:
depositing the first layer; and
patterning the first layer, wherein the first edge includes a receding edge after patterning.
3. The process of claim 2 , wherein forming the second structure comprises forming a well structure.
4. The process of claim 2 , wherein the first structure has a first edge and a second edge, and wherein the first layer overlies the second edge.
5. The process of claim 1 , wherein the first structure includes a third layer lying between a user side of the electronic device and each of the second structure and the second layer.
6. The process of claim 5 , wherein the third layer has a third refractive index of 1.8 to 3.0, wherein:
a first difference is an absolute value of the first refractive index minus the second refractive index;
a second difference is an absolute value of the first refractive index minus the third refractive index; and
the first difference is larger than the second difference.
7. The process of claim 5 , wherein:
the first structure comprises an electrode; and
the second structure comprises a well structure.
8. The process of claim 5 , wherein the third layer comprises an organic active layer.
9. The process of claim 1 , wherein the second layer comprises an organic active layer.
10. The process of claim 1 , wherein forming the second structure comprises forming a well structure.
11. The process of claim 1 , wherein the first structure has a first edge and a second edge, and wherein the first layer overlies the second edge.