RED PHOSPHOR AND LIGHT EMITTING DEVICE

PROBLEM TO BE SOLVED: To provide a high-luminance red phosphor of the general formula:EuSrCaAlSiNO, a manufacturing method therefor and a light emitting element using the same.SOLUTION: There is provided a phosphor having a chemical composition, by summing all crystal phases, represented by the gene...

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Hauptverfasser: INABA RYOJI, NONOGAKI RYOZO, TAKEDA YUSUKE, KOBAYASHI MANABU
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a high-luminance red phosphor of the general formula:EuSrCaAlSiNO, a manufacturing method therefor and a light emitting element using the same.SOLUTION: There is provided a phosphor having a chemical composition, by summing all crystal phases, represented by the general formula:EuSrCaAlSiNO, where 0.0001≤a≤0.1, 0.85≤a+b+c≤1, d+e=2, 2.5≤f≤3.5, 0.1≤g≤0.25, peak wavelength of fluorescence spectrum by an excitation ray with wavelength of 455 nm of 600 nm or more and 655 nm or less, diffuse reflection factor to light irradiation of the peak wavelength of 85% or more and average diffuse reflection factor to light irradiation with wavelength of 700 to 800 nm of 90% or more.SELECTED DRAWING: None 【課題】一般式:EuaSrbCacAldSieNfOgの高輝度の赤色蛍光体、及び製造方法を提供するとともに、これらを使用した発光素子を提供する。【解決手段】全結晶相を合計した化学組成が、一般式:EuaSrbCacAldSieNfOg(ただし、0.0001≦a≦0.1、0.85≦a+b+c≦1、d+e=2、2.5≦f≦3.5、0.1≦g≦0.25)で示され、波長455nmの励起光による蛍光スペクトルのピーク波長が、600nm以上655nm以下であり、前記ピーク波長の光照射に対する拡散反射率が、85%以上であり、かつ波長700〜800nmの光照射に対する平均拡散反射率が、90%以上である蛍光体を提供する。【選択図】なし