White light LED with rubidium vapor emission in nested enclosure optimizing human vision and horticultural pigment irradiance
US12087889B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Mar 8, 2024 |
| Grant date | Sep 10, 2024 |
| Priority date | — |
| Expiry date | Mar 8, 2044 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8515
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Chlorophyll a absorbs violet (high-energy; max. 372 nm) and orange light (low-energy; max. 642 nm) the most; the mid-point being 507 nm. Chlorophyll b absorbs mostly blue (high energy; max. 392 nm) and yellow (low-energy; max. 626 nm) light; the mid-point being 509 nm. They both also absorb light of other wavelengths with less intensity. Both mid-points are nearly identical to the mid-point between energy and entropy maximum of scattered sunlight. The claimed microelectronic device provides radiation for artificial lighting applications from ruthenium vapor in the blue and deep red region. The entropy (heat) generated by inefficiencies in p-n junction recombination and luminescent materials' Stokes shift is transferred to the thermodynamic heats of evaporation and sublimation of rubidium atoms. The microelectronic device eliminates the need for external cooling of indoor greenhouse environments used for growth of crops under continuous artificial lighting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.