Red phosphor and method for producing same
AssigneeStella Chemifa Corporation
InventorsHiroaki Takatori, Shinya Kumazawa, Tetsuya Arakawa, Tetsuo Nishida
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Abstract
A red phosphor that has optical characteristics and durability under high-temperature and high-humidity environments, and a method for producing the same. The red phosphor includes a Mn-activated complex fluoride represented by the following general formula (1) and bismuth: A2MF6:Mn4+ (1) wherein A represents at least one alkali metal element selected from the group consisting of lithium, sodium, potassium, rubidium and cesium, and M represents at least one tetravalent element selected from the group consisting of silicon, germanium, tin, titanium, zirconium and hafnium.
Claims11
A red phosphor consisting of:
- comprising:
- a particulate of Mn-activated complex fluoride represented by the following general formula (1) that is at least partially coated with a coating layer containing bismuth:
- A2MF6:Mn4+ (1)
- wherein A represents at least one alkali metal element selected from the group consisting of lithium, sodium, potassium, rubidium and cesium, and M represents at least one tetravalent element selected from the group consisting of silicon, germanium, tin, titanium, zirconium and hafnium.
A method for producing red phosphor, which comprises a step of bringing a treatment liquid containing bismuth into contact with a Mn-activated complex fluoride particulate represented by the following general formula (1) and producing a red phosphor consisting of a coated particulate Mn-activated complex fluoride at least partially coated with a coating layer containing bismuth:
- A2MF6:Mn4+ (1)
- wherein A represents at least one alkali metal element selected from the group consisting of lithium, sodium, potassium, rubidium and cesium, and M represents at least one tetravalent element selected from the group consisting of silicon, germanium, tin, titanium, zirconium and hafnium.
Dependencies are inferred from the claim text.