Phosphor and manufacturing method of the same, and light emitting device using the phosphor
US7445730B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2005 |
| Grant date | Nov 4, 2008 |
| Priority date | — |
| Expiry date | Aug 7, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8512
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
To provide a phosphor having a broad emission spectrum in a range of blue color (peak wavelength from 400 nm to 500 nm), having a broad and flat excitation band in the range of near ultraviolet/ultraviolet, and having excellent emission efficiency and emission intensity/luminance. The phosphor is expressed by a general composition formula MmAaBbOoNn:Z (where element M is at least one or more kind of element having bivalent valency, element A is at least one or more kind of element having tervalent valency, element B is at least one or more kind of element having tetravalent valency, O is oxygen, N is nitrogen, and element Z is at least one or more kind of element acting as an activator.), satisfying 5.0<(a+b)/m<9.0, 0≦a/m≦2.0, 0≦o<n, n=2/3m+a+4/3b−2/3o, and having an emission spectrum with a maximum peak wavelength from 400 nm to 500 nm under an excitation of the light in a wavelength range from 350 nm to 430 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.