Method of producing nitride fluorescent material, and nitride fluorescent material
US10604701B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2017 |
| Grant date | Mar 31, 2020 |
| Priority date | — |
| Expiry date | Sep 18, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/0883
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of producing a nitride fluorescent material including a step of first heat-treating a first compound containing at least one alkaline earth metal element selected from the group consisting of Ba, Sr, Ca and Mg, a second compound containing at least one element selected from the group consisting of Eu, Ce, Tb and Mn, and a Si-containing compound, in an atmosphere containing nitrogen to obtain a calcined product of raw materials, and a step of second heat-treating the calcined product of raw materials, a Ba-containing compound, a Si-containing compound, and optionally a third compound containing at least one element selected from the group consisting of Eu, Ce, Tb and Mn, and optionally a fourth compound containing at least one alkaline earth metal element selected from the group consisting of Sr, Ca and Mg, in an atmosphere containing nitrogen to obtain a nitride fluorescent material is provided, wherein the ratio of the charge-in molar amount of Ba to the total charge-in molar amount of at least one alkaline earth metal element to be contained in the calcined product of raw materials in the step of obtaining the calcined product of raw materials is smaller than the ratio o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.