JP2015529707A5 - - Google Patents

Claims (30)

An element M that is at least one of Li, Na, K, Sc, Ca, Mg, Sr, Ba, and Y;
An element M ′ that is at least one of Mg, Ca, Sr, Ba, and Zn;
Silicon,
With aluminum,
Nitrogen and
A red light-emitting phosphor having a nitride-based composition containing the element RE, which is at least one of Eu, Ce, Tb, Pr, and Mn,
The red-emitting phosphor has a general crystal structure of M ′ ₂ Si ₅ N ₈ : RE with M and Al incorporated therein , wherein M is a substantially interstitial position in the general crystal structure. And Al replaces Si in the general crystal structure, and the red light-emitting phosphor has chromaticity coordinates CIE Δx and CIE after 1000 hours aging at about 85 ° C. and about 85% relative humidity. A red emitting phosphor configured such that the change in Δy is less than or equal to about 0.03 for each coordinate.   The red light-emitting phosphor according to claim 1, wherein M is Ca.   The red light-emitting phosphor according to claim 1 or 2, wherein M 'is Sr.   The red light-emitting phosphor according to claim 1, wherein the red light-emitting phosphor is made of Ca, Sr, Si, Al, N, and Eu.   The red-emitting phosphor is configured such that the decrease in photoluminescence intensity after 1000 hours of aging treatment at about 85 ° C. and about 85% relative humidity under excitation by a blue LED is about 30% or less. The red light-emitting phosphor according to claim 1.   The red light-emitting phosphor of claim 1, wherein the red light-emitting phosphor absorbs radiation having a wavelength in the range of about 200 nm to about 420 nm and emits light having a photoluminescence peak emission wavelength greater than 623 nm. The red light-emitting phosphor according to claim 1, wherein the red light-emitting phosphor is Ca _0.1 Sr _2.0 Al _0.20 Si _4.80 N ₈ : Eu. The red light-emitting phosphor according to claim 1, wherein the red light-emitting phosphor is Eu _0.05 Ca _0.1 Sr _1.95 Al _0.20 Si _4.80 N ₈ . Chemical formula M _{(x / v)} M ′ ₂ Si _5-x Al _x N ₈ : RE (wherein
M is at least one monovalent, divalent, or trivalent metal having a valence v;
M ′ is at least one of Mg, Ca, Sr, Ba, and Zn;
RE is a red light-emitting phosphor comprising a nitride-based composition represented by the following formula: RE is at least one of Eu, Ce, Tb, Pr, and Mn,
x satisfies 0.1 ≦ x <0.4, the red light-emitting phosphor has a general crystal structure of M ′ ₂ Si ₅ N ₈ : RE, and Al is Si in the general crystal structure. A red light-emitting phosphor that is replaced and in which M is located substantially at an interstitial position in the general crystal structure. The red light-emitting phosphor according to claim 9 , wherein M is at least one of Li, Na, K, Sc, Ca, Mg, Sr, Ba, and Y. The red light-emitting phosphor according to claim 9 , wherein M is Ca, M 'is Sr, and RE is Eu. The red light-emitting phosphor according to claim 9 , wherein the red light-emitting phosphor is made of Ca, Sr, Si, Al, N, and Eu. The red light-emitting phosphor according to claim 9 , wherein x satisfies 0.10 ≦ x <0.25. The red-emitting phosphor is configured such that the decrease in photoluminescence intensity after 1000 hours of aging treatment at about 85 ° C. and about 85% humidity under excitation by a blue LED is about 30% or less. The red light-emitting phosphor according to claim 9 . The red-emitting phosphor has a deviation in chromaticity coordinates CIE Δx and CIE Δy after 1000 hours aging treatment at about 85 ° C. and about 85% relative humidity of less than about 0.03 for each coordinate, or The red-emitting phosphor according to claim 9 , wherein the red-emitting phosphor is configured to be equal thereto. 10. The red light emitting phosphor of claim 9 , wherein the red light emitting phosphor absorbs radiation having a wavelength in the range of about 200 nm to about 420 nm and emits light having a photoluminescence peak emission wavelength greater than 623 nm. The red light-emitting phosphor is
Eu _0.05 Ca _0.075 Sr _1.95 Al _0.15 Si _4.85 N ₈ ;
Eu _0.05 Ca _0.1 Sr _1.95 Al _0.20 Si _4.80 N ₈ ;
Eu _0.05 Ca _0.125 Sr _1.95 Al _0.25 Si _4.75 N ₈ ;
Eu _0.05 Ca _0.15 Sr _1.95 Al _0.30 Si _4.70 N ₈ ;
The phosphor according to claim 9 , which is selected from the group consisting of Eu _0.05 Ca _0.2 Sr _1.95 Al _0.40 Si _4.60 N ₈ . An excitation source having an emission wavelength in the range of 200 nm to 480 nm;
Chemical formula M _{(x / v)} M ′ ₂ Si _5-x Al _x N ₈ : RE (wherein
M is at least one monovalent, divalent, or trivalent metal having a valence v;
M ′ is at least one of Mg, Ca, Sr, Ba, and Zn;
RE is a red light-emitting phosphor containing a nitride-based composition represented by (Eu, Ce, Tb, Pr, and Mn), wherein x is 0.1 ≦ x < 0.4 and having a general crystal structure of M ′ ₂ Si ₅ N ₈ : RE, Al replaces Si in the general crystal structure, and M is substantially interstitial in the general crystal structure. A red-emitting phosphor , located at a position, configured to absorb excitation radiation from the excitation source and to emit light having a peak emission wavelength in the range of about 620 nm to about 650 nm;
Provided with at least one of the yellow-emitting phosphor and green-emitting phosphor, a white light illumination source. The white light of claim 18 , wherein the red-emitting phosphor is configured to absorb excitation radiation from the excitation source and emit light having a peak emission wavelength in the range of about 628 nm to about 634 nm. Illumination source. The white light illumination source of claim 18 , wherein the red-emitting phosphor has the formula Eu: Ca _0.1 Sr _2.0 Al _0.20 Si _4.80 N ₈ . The white light illumination source of claim 18 , wherein at least one of the yellow-emitting phosphor and the green-emitting phosphor has the formula Ce: Lu ₃ Al ₅ O ₁₂ . The white light illumination source of claim 18 , wherein the excitation source has an emission wavelength in the range of 420 nm to 470 nm. The white light illumination source of claim 18, wherein M is at least one of Li, Na, K, Sc, Ca, Mg, Sr, Ba, and Y. The white light illumination source of claim 18, wherein M is Ca, M ′ is Sr, and RE is Eu. The white light illumination source according to claim 18, wherein the red light emitting phosphor is made of Ca, Sr, Si, Al, N, and Eu. The white light illumination source according to claim 18, wherein x satisfies 0.10 ≦ x <0.25. The change in chromaticity coordinates CIE Δx and CIE Δy after 1000 hours of aging treatment at about 85 ° C. and about 85% relative humidity is less than about 0.03 for each coordinate, or The white light illumination source of claim 18, wherein the source is white light. The red light-emitting phosphor according to claim 1, wherein RE is Eu. The red light emitting phosphor is Ca. _0.1 Sr _2.0 Al _0.20 Si _4.80 N ₈ The red light-emitting phosphor according to claim 9, wherein the phosphor is Eu. The red light-emitting phosphor according to claim 13, wherein M is Ca, M 'is Sr, and RE is Eu.