JP5110518B2 - 蛍光体とその製造方法および照明器具 - Google Patents
蛍光体とその製造方法および照明器具 Download PDFInfo
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- JP5110518B2 JP5110518B2 JP2007523982A JP2007523982A JP5110518B2 JP 5110518 B2 JP5110518 B2 JP 5110518B2 JP 2007523982 A JP2007523982 A JP 2007523982A JP 2007523982 A JP2007523982 A JP 2007523982A JP 5110518 B2 JP5110518 B2 JP 5110518B2
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims description 186
- 238000004519 manufacturing process Methods 0.000 title claims description 13
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- 238000010304 firing Methods 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
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- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 6
- 238000010894 electron beam technology Methods 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
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- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
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- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
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- 229910018509 Al—N Inorganic materials 0.000 description 1
- 229910018516 Al—O Inorganic materials 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
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- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
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- XDRZCEWEEDNXBJ-UHFFFAOYSA-H hexasodium;2-methylprop-2-enoate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].CC(=C)C([O-])=O.CC(=C)C([O-])=O.CC(=C)C([O-])=O.CC(=C)C([O-])=O.CC(=C)C([O-])=O.CC(=C)C([O-])=O XDRZCEWEEDNXBJ-UHFFFAOYSA-H 0.000 description 1
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- 238000004020 luminiscence type Methods 0.000 description 1
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- 229910017604 nitric acid Inorganic materials 0.000 description 1
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- 229940110728 nitrogen / oxygen Drugs 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
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- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 description 1
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
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- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
- C04B35/597—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon oxynitride, e.g. SIALONS
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
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- C09K11/0883—Arsenides; Nitrides; Phosphides
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Description
Mx(Si12−(m+n)Alm+n)(OnN16−n)
で示される。ここで、xはα型Si3N4単位格子に含まれるMの原子数である。また、m値はα型Si3N4構造のSi−N結合を置換するAl−N結合の数に相当するもので、m=δx(ただし、δは金属Mの価数)の関係にある。n値はSi−N結合を置換するAl−O結合の数である。この格子置換と金属の侵入型固溶によって電気的に中性が保たれる。α−サイアロンでは金属−窒素の結合が主であり、窒素含有率が高い固溶体である。
(Mx、Ay)(Si12−(m+n)Alm+n)(OnN16−n)・・・・・・(1)
m=δM×x+δA×y・・・・・・・・・・・・・・・・・(2)
で示されるα型サイアロン結晶(ただし、δ M はM元素の価数、δ A はA元素の価数、xはサイアロン単位格子中のMの固溶量、yはサイアロン単位格子中のA元素の固溶量、nはサイアロン単位格子中の酸素の含有量を表す。)におけるパラメータxとyとmとnとが、
0.2≦x≦2.4 ・・・・・・・・・・・・・・・・・(3)
0.001≦y≦0.4 ・・・・・・・・・・・・・・・(4)
0.5×m<n≦4 ・・・・・・・・・・・・・・・・・(5)
0.6≦m≦1.4 ・・・・・・・・・・・・・・・・・(7)
0.8≦n≦2 ・・・・・・・・・・・・・・・・・・・(8)
の範囲の値である組成式で示されるα型サイアロン結晶を主成分とし、励起源を照射することにより波長560nmから575nmの範囲の波長にピークを持つ蛍光を発する、蛍光体。
(2)A元素(ただし、Aは、Eu)と、M元素(ただし、Mは、Ca)と、Siと、Alと、酸素と、窒素とを含有し、一般式、
(M x 、A y )(Si 12−(m+n) Al m+n )(O n N 16−n )・・・・(1)
m=δ M ×x+δ A ×y ・・・・・・・・・・・・・・・(2)
で示されるα型サイアロン結晶(ただし、δ M はM元素の価数、δ A はA元素の価数、xはサイアロン単位格子中のCaの固溶量、yはサイアロン単位格子中のEu元素の固溶量、nはサイアロン単位格子中の酸素の含有量を表す。)におけるパラメータxとyが、
0.2≦x≦2.4 ・・・・・・・・・・・・・・・・・(3)
0.001≦y≦0.4 ・・・・・・・・・・・・・・・(4)
の範囲の値である組成式で示されるα型サイアロン結晶を主成分とする、蛍光体の製造方法において、mとnとの関係が
0.5×m<n≦4 ・・・・・・・・・・・・・・・・・(5)
0.6≦m≦1.4 ・・・・・・・・・・・・・・・・・(7)
0.8≦n≦2 ・・・・・・・・・・・・・・・・・・・(8)
式(5)、(7)および(8)となるようにする、波長560nmから575nmの範囲の波長にピークを持つ蛍光を発する蛍光体の製造方法。
(3)前記パラメータm及びnが、
0.6×m≦n≦2 ・・・・・・・・・・・・・・・・・(6)
の範囲の値である、上記(2)に記載の蛍光体の製造方法。
(4)励起源が100nm以上500nm以下の波長を持つ紫外線または可視光である、上記(1)に記載の蛍光体。
(5)励起源が照射されたとき発光する色がCIE色度座標上の(x、y)値で、
0.3≦x≦0.5 ・・・・・・・・・・・・・・・・(9)
0.46≦y≦0.6 ・・・・・・・・・・・・・・・(10)
以上の条件を満たす、上記(1)または(4)のいずれかに記載の蛍光体。
(6)短軸径0.5μm以上で、アスペクト比が3以上の形態のサイアロン一次粒子を含む、上記(1)、(4)または(5)のいずれかに記載の蛍光体。
(7)前記α型サイアロン結晶以外の他の結晶相あるいはアモルファス相をさらに含み、前記α型サイアロン結晶の含有量は10質量%以上である、上記(1)に記載の蛍光体。
(8)前記α型サイアロン結晶の含有量は50質量%以上である、上記(7)に記載の蛍光体。
(9)前記他の結晶相あるいはアモルファス相が導電性を持つ無機物質である、上記(7)または(8)に記載の蛍光体。
(10)少なくともCaの酸化物と、Euの酸化物と、窒化ケイ素と、窒化アルミニウムと、酸化ケイ素または酸化アルミニウムとを含む原料混合物を、窒素雰囲気中において1500℃以上2200℃以下の温度範囲で焼成する焼成工程を含む、上記(2)に記載の蛍光体の製造方法。
(11)発光光源と蛍光体から構成される照明器具において、該蛍光体は、少なくとも上記(1)、(4)から(9)のいずれかに記載の蛍光体を含む、照明器具。
(12)前記発光光源が、330〜500nmの波長の光を発する発光ダイオード(LED)、レーザダイオード(LD)、有機EL素子、または無機EL素子を含む、上記(11)に記載の照明器具。
(13)前記発光光源が330〜420nmの波長の光を発するLEDまたはLDであり、上記(1)、(4)から(9)のいずれかに記載の蛍光体と、330〜420nmの励起光により450nm〜500nmの波長に発光ピークを持つ青色蛍光体と、330〜420nmの励起光により600nm〜700nmの波長に発光ピークを持つ赤色蛍光体とを用いることにより、青色光と緑色光と赤色光を混合して白色光を発する、上記(11)または(12)に記載の照明器具。
(13)前記発光光源が430〜480nmの波長の青色光を発するLEDまたはLDであり、励起光源の青色光と前記蛍光体の黄色光とを混合して白色光を発する、上記(11)または(12)に記載の照明器具。
(14)前記発光光源が430〜480nmの波長の青色光を発するLEDまたはLDであり、前記蛍光体と、430〜480nmの励起光により580nm〜700nmの波長に発光ピークを持つ橙ないし赤色蛍光体(以下「第2の蛍光体」という)とを用いることにより、励起光源の青色光と、前記蛍光体の黄色光と該第2の蛍光体の橙ないし赤色光を混合して白色光を発する、上記(11)または(12)に記載の照明器具。
(16)前記第2の蛍光体がEuを付活したCaAlSiN 3 である、上記(15)に記載の照明器具。
(17)前記第2の蛍光体がEuを付活したCa−αサイアロンである、上記(15)に記載の照明器具。
(18)少なくとも上記(1)、(4)から(9)のいずれかに記載の蛍光体と、該蛍光体の励起源とを含む画像表示装置。
(19)前記励起源が、電子線、電場、真空紫外線、または紫外線である、上記(18)に記載の画像表示装置。
(20)蛍光表示管(VFD)、フィールドエミッションディスプレイ(FED)、プラズマディスプレイパネル(PDP)、陰極線管(CRT)のいずれかを含む、上記(18)または(19)に記載の画像表示装置。
2、3 リードワイヤ。
4 発光ダイオード素子。
5 ボンディングワイヤ。
6、8 樹脂。
7 蛍光体。
21 基板実装用チップ型白色発光ダイオードランプ。
22、23 リードワイヤ。
24 発光ダイオード素子。
25 ボンディングワイヤ。
26、28 樹脂。
27 蛍光体。
29 アルミナセラミックス基板。
30 側面部材。
31 赤色蛍光体。
32 緑色蛍光体。
33 青色蛍光体。
34、35、36 紫外線発光セル。
37、38、39、40 電極。
41、42 誘電体層。
43 保護層。
44、45 ガラス基板。
(Mx、Ay)(Si12−(m+n)Alm+n)(OnN16−n)
で示される。パラメータmはxおよびyによって決まる値であり、
m = δM×x + δA×y
の関係にある。ここで、δMはM元素の価数であり、例えば、Liは1、MgやCaは2、YやLaは3である。
0.2 ≦ x ≦ 2.4
0.001 ≦ y ≦ 0.4
0.5×m < n ≦ 4
の範囲の値をとる。xはサイアロンの単位格子中に固溶するM原子の数であり、xが0.2より小さいとαサイアロン結晶が安定化せずにβサイアロンとなるため、発光色の変化や輝度の低下が起こる。2.4より多いとα型サイアロン以外の結晶相が析出するため発光輝度が低下する。yはサイアロンの単位格子中に固溶する付活元素であるA原子の数であり、yが0.001より小さいと光学活性イオンが少なすぎるため輝度が低く、0.4より大きいとA原子間の相互作用による濃度消光が起こり輝度が低下する。
n=0.5×δM×x=0.5×m
の関係にある。
0.5×m < n ≦ 4
の範囲の値とする組成範囲において、発光波長の低波長化と高輝度化を達成できることを見いだした。n値が0.5×m以下の場合、結晶格子中の酸素量が少ないため、発光波長が長波長化する傾向がある。n値が4より大きいとα−サイアロン以外の結晶相の割合が多くなるため、発光強度が低下するおそれがある。
0.6×m ≦ n ≦ 2
の範囲の値である。
0.6 ≦ m ≦ 1.4
0.8 ≦ n ≦ 2
の範囲の値である蛍光体は、励起源を照射することにより波長560nmから575nmの範囲の波長にピークを持つ蛍光を発するため、青色LEDを励起源とする白色LED用途には特に好ましい。
0.3 ≦ x ≦ 0.5
0.46 ≦ y ≦ 0.6
の範囲の黄緑色の発光を示す。以上の発光特性により、照明器具、画像表示装置に好適である。これに加えて、温度変化による発光輝度の変動が小さく、酸化雰囲気および水分環境下での長期間の安定性にも優れている。
CaとEuを含有するα型サイアロンにおいて、設計パラメータx、y、m、n値、およびCaxEuySiaAlbOcNd材料組成におけるx、y、a、b、c、d値(表1−1、表1−2、表2−1、表2−2)となる組成を検討した。実施例1〜70の設計組成のパラメータを、それぞれ、表1−1、表1−2、表2−1、表2−2に示す。組成のm値とn値を図1に示す。これらの設計に基づいて、表3−1と表3−2の設計組成を得るべく、炭酸カルシウム粉末と、酸化ユーロピウム粉末と、窒化ケイ素粉末と、窒化アルミニウム粉末と、酸化アルミニウム粉末とを、表4−1と表4−2の組成で混合した。ここで、表4−1と表4−2は、実施例1〜70の混合組成を示している。混合に用いた原料粉末は、炭酸カルシウム(CaCO3;高純度科学研究所製)粉末と、酸化ユーロピウム(Eu2O3;純度99.9%、信越化学工業(株)製)と、比表面積11.2m2/gの粒度の、酸素含有量1.29重量%、α型含有量95%の窒化ケイ素粉末(宇部興産(株)製のSN−E10グレード)と、比表面積3.3m2/gの粒度の、酸素含有量0.85重量%の窒化アルミニウム粉末((株)トクヤマ製のFグレード)と、比表面積13.6m2/gの粒度の酸化アルミニウム粉末(大明化学工業(株)製タイミクロングレード)である。これらの粉末を表4−1,4−2の混合組成となるように秤量し、大気中でメノウ乳棒と乳鉢を用いて10分間混合を行なった後に、得られた混合物を、500μmのふるいを通して窒化ホウ素製のるつぼに自然落下させて、るつぼに粉末を充填した。粉体の嵩密度は約25%〜30%であった。
実施例29(m=1、n=1.8)と同一組成の原料粉末混合物を実施例と同じ工程で調製し、室温から800℃まで毎時500℃の速度で加熱し、800℃で純度が99.999体積%の窒素を導入して圧力を0.5MPaとし、毎時500℃で1700℃まで昇温し、1700℃で24時間保持して合成を行った。次に、合成した化合物をメノウの乳鉢を用いて粉砕し、CuのKα線を用いた粉末X線回折測定を行い、α型サイアロンの生成を確認した。
実施例と同じ原料粉末を用いて、m=3、n=0のパラメータで表される、Euを付活したCa−α−サイアロン
(Ca1.3875、Eu0.1125)(Si9Al3)(O0N15)
を合成すべく、Ca3N2粉末(セラック製純度99%)と、金属Euをアンモニア気流中600℃で窒化して合成したEuN粉末(実験室合成品)と、実施例と同じSi3N4粉末と、実施例と同じAlN粉末とを、
Ca3N2:EuN:Si3N4:AlN=
7.03:1.71:45.63:45.63(モル%)
Ca3N2:EuN:Si3N4:AlN=
10.87:2.96:66.69:19.49(質量%)
の混合組成で、酸素および水分が1ppm以下のグローブボックス中で原料を混合し、実施例と同様の工程で蛍光体を合成した。X線回折によれば、合成物は、α型サイアロンが検出され、それ以外の結晶相は検出されなかった。この粉末について、蛍光分光光度計を用いて測定した、励起スペクトルと発光スペクトルを図7に示す。蛍光体の発光波長は604nm、発光強度は6209であった。比較例の組成は、本発明の組成範囲の外にあり、組成が不適切であるため、得られた蛍光体の発光波長が本発明より長波長であった。蛍光の色度は、x=0.55、y=0.45であり、橙色であった。
図8に示すいわゆる砲弾型白色発光ダイオードランプ(1)を製作した。2本のリードワイヤ(2、3)があり、そのうち1本(2)には、凹部があり、青色発光ダイオード素子(4)が載置されている。青色発光ダイオード素子(4)の下部電極と凹部の底面とが導電性ペーストによって電気的に接続されており、上部電極ともう1本のリードワイヤ(3)とが金細線(5)によって電気的に接続されている。蛍光体は実施例71で作製した蛍光体である。蛍光体(7)が樹脂に分散され、発光ダイオード素子(4)近傍に実装されている。この蛍光体を分散した第一の樹脂(6)は、透明であり、青色発光ダイオード素子(4)の全体を被覆している。凹部を含むリードワイヤの先端部、青色発光ダイオード素子、蛍光体を分散した第一の樹脂は、透明な第二の樹脂(8)によって封止されている。透明な第二の樹脂(8)は全体が略円柱形状であり、その先端部がレンズ形状の曲面となっていて、砲弾型と通称されている。
基板実装用チップ型白色発光ダイオードランプ(21)を製作した。構図を図9に示す。可視光線反射率の高い白色のアルミナセラミックス基板(29)に2本のリードワイヤ(22、23)が固定されており、それらワイヤの片端は基板のほぼ中央部に位置しもう方端はそれぞれ外部に出ていて電気基板への実装時ははんだづけされる電極となっている。リードワイヤのうち1本(22)は、その片端に、基板中央部となるように青色発光ダイオード素子(24)が載置され固定されている。青色発光ダイオード素子(24)の下部電極と下方のリードワイヤとは導電性ペーストによって電気的に接続されており、上部電極ともう1本のリードワイヤ(23)とが金細線(25)によって電気的に接続されている。
図10は、画像表示装置としてのプラズマディスプレイパネルの原理的概略図である。赤色蛍光体(CaAlSiN3:Eu2+)(31)と本発明の実施例71の緑色蛍光体(32)および青色蛍光体(BaMgAl10O17:Eu)(33)がそれぞれのセル(34、35、36)の内面に塗布されている。セル(34、35、36)は、誘電体層(41)と電極(37、38、39)とが付与されたガラス基板(44)上に位置する。電極(37、38、39、40)に通電するとセル中でXe放電により真空紫外線が発生し、これにより蛍光体が励起されて、赤、緑、青の可視光を発し、この光が保護層(43)、誘電体層(42)、ガラス基板(45)を介して外側から観察され、画像表示として機能する。
Claims (20)
- 少なくともA元素(ただし、Aは、Eu)と、M元素(ただし、Mは、Ca)と、Siと、Alと、酸素と、窒素とを含有し、一般式、
(Mx、Ay)(Si12−(m+n)Alm+n)(OnN16−n)・・・・・・(1)
m=δM×x+δA×y・・・・・・・・・・・・・・・・・(2)
で示されるα型サイアロン結晶(ただし、δ M はM元素の価数、δ A はA元素の価数、xはサイアロン単位格子中のMの固溶量、yはサイアロン単位格子中のA元素の固溶量、nはサイアロン単位格子中の酸素の含有量を表す。)におけるパラメータxとyとmとnとが、
0.2≦x≦2.4 ・・・・・・・・・・・・・・・・・(3)
0.001≦y≦0.4 ・・・・・・・・・・・・・・・(4)
0.5×m<n≦4 ・・・・・・・・・・・・・・・・・(5)
0.6≦m≦1.4 ・・・・・・・・・・・・・・・・・(7)
0.8≦n≦2 ・・・・・・・・・・・・・・・・・・・(8)
の範囲の値である組成式で示されるα型サイアロン結晶を主成分とし、励起源を照射することにより波長560nmから575nmの範囲の波長にピークを持つ蛍光を発する、蛍光体。 - A元素(ただし、Aは、Eu)と、M元素(ただし、Mは、Ca)と、Siと、Alと、酸素と、窒素とを含有し、一般式、
(Mx、Ay)(Si12−(m+n)Alm+n)(OnN16−n)・・・・(1)
m=δM×x+δA×y ・・・・・・・・・・・・・・・(2)
で示されるα型サイアロン結晶(ただし、δ M はM元素の価数、δ A はA元素の価数、xはサイアロン単位格子中のCaの固溶量、yはサイアロン単位格子中のEu元素の固溶量、nはサイアロン単位格子中の酸素の含有量を表す。)におけるパラメータxとyが、
0.2≦x≦2.4 ・・・・・・・・・・・・・・・・・(3)
0.001≦y≦0.4 ・・・・・・・・・・・・・・・(4)
の範囲の値である組成式で示されるα型サイアロン結晶を主成分とする、蛍光体の製造方法において、mとnとの関係が
0.5×m<n≦4 ・・・・・・・・・・・・・・・・・(5)
0.6≦m≦1.4 ・・・・・・・・・・・・・・・・・(7)
0.8≦n≦2 ・・・・・・・・・・・・・・・・・・・(8)
式(5)、(7)および(8)となるようにする、波長560nmから575nmの範囲の波長にピークを持つ蛍光を発する蛍光体の製造方法。 - 前記パラメータm及びnが、
0.6×m≦n≦2 ・・・・・・・・・・・・・・・・・(6)
の範囲の値である、請求項2に記載の蛍光体の製造方法。 - 励起源が100nm以上500nm以下の波長を持つ紫外線または可視光である、請求項1に記載の蛍光体。
- 励起源が照射されたとき発光する色がCIE色度座標上の(x、y)値で、
0.3≦x≦0.5 ・・・・・・・・・・・・・・・・(9)
0.46≦y≦0.6 ・・・・・・・・・・・・・・・(10)
以上の条件を満たす、請求項1または4のいずれかに記載の蛍光体。 - 短軸径0.5μm以上で、アスペクト比が3以上の形態のサイアロン一次粒子を含む、請求項1、4または5のいずれかに記載の蛍光体。
- 前記α型サイアロン結晶以外の他の結晶相あるいはアモルファス相をさらに含み、
前記α型サイアロン結晶の含有量は10質量%以上である、請求項1に記載の蛍光体。 - 前記α型サイアロン結晶の含有量は50質量%以上である、請求項7に記載の蛍光体。
- 前記他の結晶相あるいはアモルファス相が導電性を持つ無機物質である、請求項7または8に記載の蛍光体。
- 少なくともCaの酸化物と、Euの酸化物と、窒化ケイ素と、窒化アルミニウムと、酸化ケイ素または酸化アルミニウムとを含む原料混合物を、窒素雰囲気中において1500℃以上2200℃以下の温度範囲で焼成する焼成工程を含む、請求項2に記載の蛍光体の製造方法。
- 発光光源と蛍光体から構成される照明器具において、該蛍光体は、少なくとも請求項1、4から9のいずれかに記載の蛍光体を含む、照明器具。
- 前記発光光源が、330〜500nmの波長の光を発する発光ダイオード(LED)、レーザダイオード(LD)、有機EL素子、または無機EL素子を含む、請求項11に記載の照明器具。
- 前記発光光源が330〜420nmの波長の光を発するLEDまたはLDであり、請求項1、4から9のいずれかに記載の蛍光体と、330〜420nmの励起光により450nm〜500nmの波長に発光ピークを持つ青色蛍光体と、330〜420nmの励起光により600nm〜700nmの波長に発光ピークを持つ赤色蛍光体とを用いることにより、青色光と緑色光と赤色光を混合して白色光を発する、請求項11または12に記載の照明器具。
- 前記発光光源が430〜480nmの波長の青色光を発するLEDまたはLDであり、励起光源の青色光と前記蛍光体の黄色光とを混合して白色光を発する、請求項11または12に記載の照明器具。
- 前記発光光源が430〜480nmの波長の青色光を発するLEDまたはLDであり、前記蛍光体と、430〜480nmの励起光により580nm〜700nmの波長に発光ピークを持つ橙ないし赤色蛍光体(以下「第2の蛍光体」という)とを用いることにより、励起光源の青色光と、前記蛍光体の黄色光と該第2の蛍光体の橙ないし赤色光を混合して白色光を発する、請求項11または12に記載の照明器具。
- 前記第2の蛍光体がEuを付活したCaAlSiN3である、請求項15に記載の照明器具。
- 前記第2の蛍光体がEuを付活したCa−αサイアロンである、請求項15に記載の照明器具。
- 少なくとも請求項1、4から9のいずれかに記載の蛍光体と、該蛍光体の励起源とを含む画像表示装置。
- 前記励起源が、電子線、電場、真空紫外線、または紫外線である、請求項18に記載の画像表示装置。
- 蛍光表示管(VFD)、フィールドエミッションディスプレイ(FED)、プラズマディスプレイパネル(PDP)、陰極線管(CRT)のいずれかを含む、請求項18または19に記載の画像表示装置。
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