Stacked organic electroluminescent device
AssigneeBeijing Summer Sprout Technology Co., Ltd.
InventorsJing Wang, Huiqing Pang, Zhihao Cui, Chi Yuen Raymond Kwong, Chuanjun Xia
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Abstract
Provided is a stacked organic electroluminescence device. At least one light-emitting unit of the stacked organic electroluminescent device includes an organic layer including a specific combination of a P-type material with a deep LUMO energy level and a hole transporting material with a deep HOMO energy level. Meanwhile, a P-type material is used as the buffer layer of the charge generation layer between the light-emitting units. The device can offer better device performance and more simplified fabrication process. Further provided is a display assembly including the device.
Claims24
An organic electroluminescent device, comprising:
- a first electrode,
- a second electrode, and
- at least two light-emitting units disposed between the first electrode and the second electrode, wherein each light-emitting unit comprises at least one emissive layer;
- wherein at least one light-emitting unit comprises a first organic layer comprising a first organic material and a second organic material;
- wherein a charge generation layer is disposed between at least one group of adjacent two light-emitting units, and the charge generation layer comprises a buffer layer, wherein the buffer layer comprises a third organic material;
- wherein the lowest unoccupied molecular orbital (LUMO) energy level of the first organic material is greater than or equal to the LUMO energy level of the third organic material, and the LUMO energy level of the third organic material is greater than 4.90 eV;
- wherein the highest occupied molecular orbital (HOMO) energy level of the second organic material is greater than 4.99 eV.
Dependencies are inferred from the claim text.