Electroluminescent and photoluminescent multiband white light emitting diode
US9214601B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2014 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Dec 31, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/84
Abstract
An electroluminescent and photoluminescent white light emitting diode (LED) includes an electroluminescent light emitting structure, a first photoluminescent light emitting layer, a second photoluminescent light emitting layer and a red light emitting layer. The electroluminescent light emitting structure emits a violet light having a wavelength between 395 nm and 450 nm and an FWHM smaller than 25 nm. The first photoluminescent light emitting layer and the second photoluminescent light emitting layer are sequentially disposed on the electroluminescent light emitting structure. The first photoluminescent light emitting layer absorbs the violet light to generate a blue light. The second photoluminescent light emitting layer absorbs the violet light and the blue light to generate a green light. The red light emitting layer generates a red light. Accordingly, the violet light, the blue light, the green light and the red light are blended to form a white light having a high color rendering index.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.