Thin-film white LED chip
US11984538B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 2021 |
| Grant date | May 14, 2024 |
| Priority date | — |
| Expiry date | Jul 28, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K50/115
Abstract
A thin-film white LED chip includes a transparent substrate, a first transparent electrode, an emissive structure, a second transparent electrode, and a first phosphorescent/fluorescent layer respectively arranged in sequence. The emissive structure includes an emissive layer, an electron injection layer and a hole injection layer respectively formed at both sides of the emissive layer, and a total thickness of the electron injection layer and the second transparent electrode (in an inverted structure) or a total thickness of the hole injection layer and the second transparent electrode (in a conventional structure) is smaller than a length of one emission wavelength of the emissive layer. The evanescent wave generated by total internal reflection can penetrate into and be absorbed by the first phosphorescent/fluorescent layer to further emit light, thereby the overall external quantum efficiency of the LED chip is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.