Phosphor and manufacturing method of the same, and light emitting device using the phosphor
US7524437B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2006 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | Jan 7, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8512
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
To provide a phosphor having an emission spectrum with a broad peak in a range from green color to yellow color, having a broad and flat excitation band capable of using lights of broad range from near ultraviolet/ultraviolet to blue lights as excitation lights, and having excellent emission efficiency and luminance. The problem is solved by providing the phosphor expressed by a general composition formula MmAaBbOoNn:Z (where element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is one or more kinds of elements acting as the activator.), satisfying 4.0<(a+b)/m<7.0, a/m≧0.5, b/a >2.5, n>o, n=2/3 m+a+4/3 b−2/3 o.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.