Patent · US Active

Fluorescent lighting creating white light

US8035287B2 · kind B2 · utility

10Cited by

2References

20Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Peter Josef Schmidt · Aachen, DE
Hans-Helmut Bechtel · Roetgen, DE
Wolfgang Busselt · Roetgen, DE

Key dates

Filing date	Apr 10, 2007
Grant date	Oct 11, 2011
Priority date	—
Expiry date	Jan 21, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B20/00
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A light emitting system (1) comprising a radiation source (2) capable of emitting a first light of at least a first wavelength spectrum; a first fluorescent material (4) capable of absorbing at least partially the first light and emitting second light having a second wavelength spectrum; a second fluorescent material (8) capable of absorbing at least partially the first light and emitting a third light having a third wavelength spectrum; wherein one, the first (4) or the second fluorescent material (8) is a polycrystalline ceramic with a density of more than 97 percent of the density of a monocrystalline material and the respective other fluorescent material is a phosphor powder with a median particle size 100 nm<d50%<50 μm.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.