Fluorescent lamp with multi-layer phosphor coating
US8461753B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2011 |
| Grant date | Jun 11, 2013 |
| Priority date | — |
| Expiry date | Oct 25, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/48
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A low-pressure discharge lamp includes, in an exemplary embodiment, a light-transmissive envelope, a fill-gas composition capable of sustaining a discharge sealed inside the light-transmissive envelope, and a phosphor composition at least partially disposed on an interior surface of the light-transmissive envelope. The phosphor composition is disposed on an interior surface of the light-transmissive envelope in a plurality of layers that include at least a basecoat phosphor layer and a topcoat phosphor layer. The basecoat phosphor layer includes at least one halophosphor and the topcoat phosphor layer includes a blend of at least two rare earth phosphors. The basecoat phosphor layer has a greater Color Rendering Index (CRI) value than the topcoat phosphor layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.