Luminescent screen for low pressure mercury discharge lamp with specific emission range
US6144152A · kind A · utility
2Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Dec 9, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7795
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Color rendering indices Ra,8 between 80 and 90 and R9 greater than 20, and a color point on or near the Planckian curve, are achieved with a lamp vessel provided with a luminescent screen including a first luminescent substance which emits predominantly between 520 nm and 565 nm, a second luminescent substance which emits predominantly between 590 nm and 630 nm, and a third luminescent substance which emits predominantly in the range between 615 nm and 780 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.