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US 10,256,374 B2Granted
Light emitting device
AssigneeNichia Corporation
InventorKenji Asai
Life of this patent
Estimating the term…
Abstract
A light emitting device that is capable of achieving excellent color rendering property is provided. The light emitting device contains a light emitting element having a light emission peak wavelength within a range of 430 nm or more and 470 nm or less, and a fluorescent member. The fluorescent member contains a first fluorescent material that contains an Eu-activated alkaline earth aluminate, a second fluorescent material that contains a Mn-activated fluorogermanate, a third fluorescent material that contains a Ce-activated rare earth aluminate, and a fourth fluorescent material that contains an Eu-activated silicon nitride having Al and at least one of Sr and Ca.
Claims24
A light emitting device comprising:
- a light emitting element having a light emission peak wavelength within a range of 430 nm or more and 470 nm or less, and
- a fluorescent member, wherein
- the light emitting device emitting light has a correlated color temperature in a range of 3,500 K or more and 4,500 K or less, and
- the fluorescent member comprises:
- a first fluorescent material that has a composition shown by the following formula (1),
- a second fluorescent material that has a composition shown by the following formula (2),
- a third fluorescent material that has a composition shown by the following formula (3), and
- a fourth fluorescent material that has a composition shown by the following formula (4), wherein
- the first fluorescent material has a content ratio in a range of 16.5% by mass or more and 50.0% by mass or less based on a total fluorescent material amount,
- the second fluorescent material has a content ratio in a range of 28.0% by mass or more and 33.0% by mass or less based on the total fluorescent material amount,
- the third fluorescent material has a content ratio in a range of 20.0% by mass or more and 35.0% by mass or less based on the total fluorescent material amount, and
- the fourth fluorescent material has a content ratio in a range of 3.0% by mass or more and 3.2% by mass or less based on the total fluorescent material amount,
- Sr4Al14O25:Eu (1)
- (x-s)MgO.(s/2)Sc2O3.yMgF2.uCaF2.(1−t)GeO2.(t/2)M2O3:zMn4+ (2)
- wherein in the formula (2), M represents at least one element selected from the group consisting of Al, Ga, and In, and x, y, z, s, t, and u respectively satisfy 2≤x≤4, 0<y<1.5, 0<z<0.05, 0≤s<0.5, 0<t<0.5, and 0≤u<1.5,
- Y3Al5O12:Ce (3)
- (Sr,Ca)AlSiN3:Eu (4).
14 more elements
A light emitting device comprising:
- a light emitting element having a light emission peak wavelength within a range of 430 nm or more and 470 nm or less, and
- a fluorescent member, wherein
- the light emitting device emitting light has a correlated color temperature in a range of 4,500 K or more and 5,500 K or less, and
- the fluorescent member comprises:
- a first fluorescent material that has a composition shown by the following formula (1),
- a second fluorescent material that has a composition shown by the following formula (2),
- a third fluorescent material that has a composition shown by the following formula (3), and
- a fourth fluorescent material that has a composition shown by the following formula (4), wherein
- the first fluorescent material has a content ratio in a range of 7.0% by mass or more and 55.0% by mass or less based on a total fluorescent material amount,
- the second fluorescent material has a content ratio in a range of 22.0% by mass or more and 31.0% by mass or less based on the total fluorescent material amount,
- the third fluorescent material has a content ratio in a range of 20.0% by mass or more and 55.0% by mass or less based on the total fluorescent material amount, and
- the fourth fluorescent material has a content ratio in a range of 2.8% by mass or more and 3.0% by mass or less based on the total fluorescent material amount,
- Sr4Al14O25:Eu (1)
- (x-s)MgO.(s/2)Sc2O3.yMgF2.uCaF2.(1−t)GeO2.(t/2)M2O3:zMn4+ (2)
- wherein in the formula (2), M represents at least one element selected from the group consisting of Al, Ga, and In, and x, y, z, s, t, and u respectively satisfy 2≤x≤4, 0<y<1.5, 0<z<0.05, 0≤s<0.5, 0<t<0.5, and 0≤u<1.5,
- Y3Al5O12:Ce (3)
- (Sr,Ca)AlSiN3:Eu (4).
14 more elements
A light emitting device comprising:
- a light emitting element having a light emission peak wavelength within a range of 430 nm or more and 470 nm or less, and
- a fluorescent member, wherein
- the light emitting device emitting light has a correlated color temperature in a range of 5,500 K or more and 7,000 K or less, and
- the fluorescent member comprises:
- a first fluorescent material that has a composition shown by the following formula (1),
- a second fluorescent material that has a composition shown by the following formula (2),
- a third fluorescent material that has a composition shown by the following formula (3), and
- a fourth fluorescent material that has a composition shown by the following formula (4), wherein
- the first fluorescent material has a content ratio in a range of 15.0% by mass or more and 40.0% by mass or less based on a total fluorescent material amount,
- the second fluorescent material has a content ratio in a range of 18.0% by mass or more and 20.0% by mass or less based on the total fluorescent material amount,
- the third fluorescent material has a content ratio in a range of 35.0% by mass or more and 60.0% by mass or less based on the total fluorescent material amount, and
- the fourth fluorescent material has a content ratio in a range of 2.6% by mass or more and 2.7% by mass or less based on the total fluorescent material amount,
- Sr4Al14O25:Eu (1)
- (x-s)MgO.(s/2)Sc2O3.yMgF2.uCaF2.(1−t)GeO2.(t/2)M2O3:zMn4+ (2)
- wherein in the formula (2), M represents at least one element selected from the group consisting of Al, Ga, and In, and x, y, z, s, t, and u respectively satisfy 2≤x≤4, 0<y<1.5, 0<z<0.05, 0≤s<0.5, 0<t<0.5, and 0≤u<1.5,
- Y3Al5O12:Ce (3)
- (Sr,Ca)AlSiN3:Eu (4).
14 more elements
Dependencies are inferred from the claim text.