Light emitting device and plant cultivation method
US10455773B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2017 |
| Grant date | Oct 29, 2019 |
| Priority date | — |
| Expiry date | Jan 6, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P60/14
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Provided is a light emitting device that includes a light emitting element having a light emission peak wavelength ranging from 380 nm to 490 nm, and a fluorescent material excited by light from the light emitting element and emitting light having at a light emission peak wavelength ranging from 580 nm or more to less than 680 nm. The light emitting device emits light having a ratio R/B of a photon flux density R to a photon flux density B ranging from 2.0 to 4.0 and a ratio R/FR of the photon flux density R to a photon flux density FR ranging from 0.7 to 13.0, the photon flux density R being in a wavelength range of 620 nm or more and less than 700 nm, the photon flux density B being in a wavelength range of 380 nm or more and 490 nm or less, and the photon flux density FR being in a wavelength range of 700 nm or more and 780 nm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.