Method for producing nitride fluorescent material, nitride fluorescent material and light emitting device
US10829689B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 2020 |
| Grant date | Nov 10, 2020 |
| Priority date | — |
| Expiry date | Jan 3, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8513
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed are a production method for a nitride fluorescent material, a nitride fluorescent material and a light emitting device. The production method is for producing a nitride fluorescent material that has, as a fluorescent material core, a calcined body having a composition containing at least one element Ma selected from the group consisting of Sr, Ca, Ba and Mg, at least one element Mb selected from the group consisting of Li, Na and K, at least one element Mc selected from the group consisting of Eu, Ce, Tb and Mn, and Al, and optionally Si, and N, and the method includes preparing a calcined body having the above-mentioned composition, bringing the calcined body into contact with a fluorine-containing substance, and subjecting it to a first heat treatment at a temperature of 100° C. or higher and 500° C. or lower to form a fluoride-containing first film on the calcined body, and forming on the calcined body, a second film that contains a metal oxide containing at least one metal element M2 selected from the group consisting of Si, Al, Ti, Zr, Sn and Zn and subjecting it to a second heat treatment at a temperature in a range of higher than 250° C. and 500° C. or lower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.