Electroluminescent device and method for preparing the same, display panel and display device
US11825671B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 2021 |
| Grant date | Nov 21, 2023 |
| Priority date | — |
| Expiry date | Jun 23, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2102/351
Abstract
The present disclosure provides an electroluminescent device and a method for preparing the same, a display panel and a display device. The electroluminescent device includes a light emitting layer, a cathode layer, and an electron transport layer arranged between the light emitting layer and the cathode layer. The electron transport layer includes at least a first electron transport material and a second electron transport material that have different LUMO energy levels, and a ratio EM1/EM2 of the weight content of the first electron transport material to that of the second electron transport material decreases in a direction from a surface thereof proximate to the cathode layer to a surface thereof proximate to the light emitting layer. The electroluminescent device of the present disclosure can improve its efficiency and lifetime.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.