OLED with electron transport layer within insulating layer
View Patent ↗The present invention provides an organic light-emitting diode (OLED) device and a manufacturing of the OLED device. The OLED device includes a light-emitting layer, an insulating layer, an electron transport layer, and an electron injection layer. The insulating layer is arranged on one side of the light-emitting layer, and a through hole is in the insulating layer. The through hole is arranged corresponding to a middle portion of the light-emitting layer. The electron transport layer is in a lower portion of the through hole and attached to a surface of the light-emitting layer. The electron injection layer is in an upper portion of the through hole and attached to one side of the electron transport layer away from the light-emitting layer.
1. An organic light-emitting diode (OLED) device, comprising:
a light-emitting layer;
an insulating layer disposed on one side of the light-emitting layer, a through hole extending through the insulating layer, wherein the through hole is arranged corresponding to a middle portion of the light-emitting layer, and a material of the insulating layer comprises a hole transporting material or an electron blocking material;
an electron transport layer disposed within a lower portion of the through hole and attached to an upper surface of the light-emitting layer; and
an electron injection layer disposed in an upper portion of the through hole and attached to one side of the electron transport layer away from the light-emitting layer.
2. The OLED device according to claim 1 , wherein the electron transport layer is attached to a bottom and a side wall of the lower portion of the through hole; and
the electron injection layer is attached to a surface of the electron transport layer and a side wall of the upper portion of the through hole.
3. The OLED device according to claim 1 , wherein a sum of a thickness of the electron transport layer and a thickness of the electron injection layer is less than or equal to a thickness of the insulating layer.
4. The OLED device according to claim 1 , wherein a thickness of the insulating layer ranges from 11 nm to 35 nm.
5. The OLED device according to claim 1 , further comprising:
a substrate;
an anode disposed on one side of the substrate;
a hole injection layer disposed on one side of the anode away from the substrate; and
a hole transport layer disposed on one side of the hole injection layer away from the substrate;
wherein the light-emitting layer is disposed on one side of the hole transport layer away from the substrate.
6. The OLED device according to claim 1 , further comprising:
a cathode disposed on one side of the electron injection layer and one side of the insulating layer away from the substrate; and
a light extraction layer disposed on one side of the cathode away from the substrate.
7. A manufacturing method of an organic light-emitting diode (OLED) device, comprising following steps:
a light-emitting layer manufacture step: forming a light-emitting layer;
an insulating layer manufacture step: forming an insulating layer on the light-emitting layer, wherein a through hole extends through the insulating layer, the through hole is arranged corresponding to a middle portion of the light-emitting layer, and a material of the insulating layer comprises a hole transporting material or an electron blocking material;
an electron transport layer manufacture step: forming an electron transport layer by inkjet printing, wherein the electron transport layer fills a lower portion of the through hole, and the electron transport layer is attached to an upper surface of the light-emitting layer; and
an electron injection layer manufacture step: forming an electron injection layer by inkjet printing, wherein the electron injection layer fills an upper portion of the through hole and is disposed within the upper portion of the through hole, and the electron injection layer is attached to an upper surface of the electron transport layer.
8. The manufacturing method of the OLED device according to claim 7 , wherein in the electron transport layer manufacture step, the electron transport layer is attached to a bottom and a side wall of the lower portion of the through hole; and
in the electron injection layer manufacture step, the electron injection layer is attached to a surface of the electron transport layer and a side wall of the upper portion of the through hole.
9. The manufacturing method of the OLED device according to claim 7 , wherein in the light-emitting layer manufacture step, the light-emitting layer is formed by inkjet printing, and the light-emitting layer is subjected to vacuum drying; and in the insulating layer manufacture step, the insulating layer is formed by evaporation through a metal mask.