http://support.spring8.or.jp/Report_JSR/PDF_IAe_ALL/IAe_11B1781.pdf

2011B1781                          BL14B2ⓑⰍ LED ⏝⺯ගయᮦᩱࡢ ᗘᾘග࣓࢝ࢽࢬ࣒ゎ᫂Investigation of the Mechanism of Thermal Quenching of Phosphor
Materials for White LEDୖ⏣ ᜤኴ a, ᮏ㛫 ᚭ⏕ b, ୗᮧ ᗣኵ a
Kyota Uedaa, Tetsuo Honmab, Yasuo Shimomuraaa㻔ᰴ㻕୕⳻໬Ꮫ⛉Ꮫᢏ⾡◊✲ࢭࣥࢱ࣮, b㻔බ㈈㻕㧗㍤ᗘග⛉Ꮫ◊✲ࢭࣥࢱ࣮ aMitsubishi Chemical Group Science and Technology Research Center, bJASRIⓑⰍ LED ࣛࣥࣉ⏝⺯ගయ RE3Al5O12:Ce㻔RE=Y, Lu㻕ࡢⓎග୰ᚰ Ce ࢖࢜ࣥࡢ౯ᩘ࠾ࡼࡧ࿘㎶ᒁᡤᵓ㐀ࢆ X ⥺྾཰ᚤ⣽ᵓ㐀㻔XAFS㻕 ᐃ࡟ࡼࡾㄪ࡭ࡓࠋCe L3-edge XANES ࢫ࣌ࢡࢺࣝ࠿ࡽ Ce ࢖࢜ࣥࡢ౯ᩘࡣ࡯ࡰ 3 ౯࡛࠶ࡿࡇ࡜ࡀศ࠿ࡗࡓࠋCe K-edge EXAFS ࢫ࣌ࢡࢺࣝ࠿ࡽᚓࡽࢀࡿືᚄᵓ㐀㛵ᩘ࠿ࡽ Ce Ⓨග୰ᚰ࿘㎶ࡢཎᏊࡀ⛛ᗎ❧ࡗ࡚࠸ࡿ࡯࡝ࠊඃࢀࡓⓎග≉ᛶࢆ♧ࡍ࡜⪃࠼ࡽࢀࡿࠋ࣮࣮࢟࣡ࢻ㸸 ⓑⰍ LEDࠊ⺯ගయࠊ ᗘᾘගࠊXAFSࠊYAG:Ceࠊࢹࣂ࢖࣮࣮࣡ࣛᅉᏊ⫼ᬒ࡜◊✲┠ⓗ㸸 ᆅ⌫ ᬮ໬࡟ࡼࡿ ᐊຠᯝ࢞ࢫ᤼ฟ㔞๐ῶ࡜ᮾ໭࣭㛵ᮾ኱㟈⅏ᚋࡢ⚟ᓥཎⓎ஦ᨾࡣࠊᡃࠎࡢ┠ࢆ෌⏕ྍ⬟࢚ࢿࣝࢠ࣮࡬ྥࡅࡿࡇ࡜࡜࡞ࡗࡓࠋࡋ࠿ࡋࠊ෌⏕ྍ⬟࢚ࢿࣝࢠ࣮ࡣ౪⤥㔞ࡀஈࡋࡃࠊ࠶ࡽࡺࡿሙ㠃࡛┬࢚ࢿࣝࢠ࣮ࡀᚲせ࡜࡞ࡿࠋ┬࢚ࢿࣝࢠ࣮ࡢ୍ࡘ࡜ࡋ࡚ࠊⓑ⇕㟁⌫࡟௦ࢃࡗ࡚ᾘ㈝㟁ຊࡢᑠࡉ࠸ⓑⰍ LED ࣛࣥࣉࡀᛴ㏿࡟ᬑཬࡋጞࡵ࡚ࡁࡓࠋ
ⓑⰍ LED ࣛࣥࣉࡣ㟷Ⰽ LED ࢳࢵࣉ࡜ࡑࡢ㟷Ⰽග࡟ࡼࡗ࡚Ⓨගࡍࡿ㯤Ⰽ⺯ගయࠊ࠶ࡿ࠸ࡣࠊ⥳Ⰽ⺯ගయ࡜㉥Ⰽ⺯ගయ࠿ࡽᡂࡿࠋࡇࢀࡽ⺯ගయࡣࠊ70㹼100Υ࡟㐩ࡋࡓ LED ࢳࢵࣉ࡟ࡼࡗ࡚ຍ⇕ࡉࢀࠊ⺯ගయ࡟ࡼࡗ࡚ࡣⓎගᙉᗘࡀⴭࡋࡃῶᑡࡋ㻔 ᗘᾘග㻕ࠊⓑⰍ LED ࣛࣥࣉ࡟⏝࠸ࡿࡇ࡜ࡀฟ᮶࡞࠸ࠋࡇࢀࡲ࡛ࠊ㧗࠸Ⓨගᙉᗘࢆ♧ࡍ⺯ගయ࡛࠶ࡗ࡚ࡶࠊ ᗘᾘගࡢᠱᛕ࠿ࡽⓑⰍ LED ࣛࣥࣉ࡬ࡢ฼⏝ࡀ㌋㌉࠶ࡿ࠸ࡣ᩿ᛕࡉࢀ࡚ࡁࡓࠋ⺯ගయࡀ♧ࡍ ᗘ≉ᛶࡢᨵⰋࡣࠊⓑⰍ LED ࣛࣥࣉࡢືసᏳᐃᛶྥୖࠊ㧗ຠ⋡໬ࡸప౯᱁໬࡟⤖ࡧࡘࡃ࡜ᮇᚅࡉࢀࡿࠋ⺯ගయࡢ ᗘᾘගࣔࢹࣝࡀࡇࢀࡲ࡛࡟ᗄࡘ࠿ᥦ᱌ࡉࢀࠊⓎග࢖࢜ࣥࡢ⇕᣺ືࡢ“᣺⯙࠸”ࡸ౯ᩘኚ໬➼ࡀ㛵㐃ࡋ࡚࠸ࡿ࡜⪃࠼ࡽࢀ࡚ࡁࡓࠋࡋ࠿ࡋࠊ ᗘ࡟ࡼࡿᾘගࡀ࡝ࡢࣃ࣓࣮ࣛࢱ࣮࡜㛵㐃ࡋ࡚࠸ࡿ࠿᫂ࡽ࠿࡟ࡉࢀ࡚ࡇ࡞࠿ࡗࡓࠋ୍᪉ࠊEXAFS ศගἲ࡟ࡼࡾ ᐃࡉࢀࡿⓎග࢖࢜ࣥࡢࢹࣂ࢖࣮࣮࣡ࣛᅉᏊࡣ㟼ⓗ࡞ᵓ㐀ࡢ஘ࢀ㻔࠶ࡿ࠸ࡣࠊᗄఱᏛ㻔㟼㻕ⓗ஘ࢀ[1]㻕࡜⇕᣺ືࡢຠᯝ㻔࠶ࡿ࠸ࡣࠊ⇕㻔ື㻕ⓗ࡞஘ࢀ[1]㻕࠿ࡽᵓᡂࡉࢀࠊࡑࡢᅉᏊࡢ⤌ᡂࡸ ᗘ࡟ࡼࡿኚ໬࠿ࡽⓎග࢖࢜ࣥࡢ⇕᣺ືࡢ“᣺⯙࠸”࡟㛵ࡍࡿ⯆࿡࠶ࡿ᝟ሗࢆᘬࡁฟࡍࡇ࡜ࡀᮇᚅࡉࢀࡿ[2]ࠋࡲࡓࠊXANES ศගἲࡣⓎග࢖࢜ࣥࡢ㟁Ꮚ≧ែࠊ౯ᩘࢆ▱ࡿࡇ࡜ࡀ࡛ࡁࡿࠋGhigna ࡽࡣ 20K ࡟࠾࠸࡚ Y3Al5O12:Ce3+࡟࠾ࡅࡿⓎග࢖࢜ࣥ㻔Ce3+㻕ࡀ♧ࡍ Ce-K ➃ࡢ EXAFS ࢆᐃࡋࠊ⇕᣺ືࢆᢚ࠼࡚ᑟ࠸ࡓ Ce3+࢖࢜ࣥࡢ㓄఩⎔ቃ࡜ᐦᗘỗ㛵ᩘἲ࡟ࡼࡾồࡵࡓࡶࡢࡀࡼࡃ୍⮴ࡍࡿ࡜ሗ࿌ࡋࠊCe3+࢖࢜ࣥࡢ㓄఩⎔ቃࢆṇ☜࡟ㄪ࡭ࡿࡇ࡜࡟ࡼࡗ࡚ Ce3+࢖࢜ࣥࡢ♧ࡍ㯤ⰍⓎගࡀࡼࡾヲࡋࡃ⌮ゎ࡛ࡁࡿ࡜ᮇᚅࡋ࡚࠸ࡿ[3]ࠋ
ᮏ◊✲ࡢ┠ⓗࡣࠊ௦⾲ⓗ࡞ⓑⰍ LED ࣛࣥࣉ⏝⺯ගయ RE3Al5O12:Ce3+㻔RE=Y, Lu㸪௨ୗ YAG, LuAG࡜␎ࡍ㻕࡟ࡘ࠸࡚ࠊప ࠿ࡽᐊ ࡲ࡛ࡢྛ ᗘ࡟࠾࠸࡚Ⓨග࢖࢜ࣥ㻔Ce3+㻕ࡢ XAFS ࢆ ᐃࡋࠊࡑࡢᗘᅉᏊࠊ౯ᩘཬࡧᒁᡤᵓ㐀ࢆồࡵࠊࡑࢀࡒࢀࡢࣃ࣓࣮ࣛࢱ࣮ࡢኚ໬ࡀ ᗘᾘග࡜࡝ࡢࡼ࠺࡞┦㛵࡟࠶ࡿ࠿᫂ࡽ࠿࡟ࡍࡿࡇ࡜࡛࠶ࡿࠋࡇࢀࡣࠊ ᗘᾘග࡜ᙉ࠸┦㛵ࡀㄆࡵࡽࢀࡓࣃ࣓࣮ࣛࢱ࣮ࢆࣔࢽࢱ࣮ࡋࠊࡇࡢ⤖ᯝࢆ ᗘᾘගᨵⰋࡢタィᣦ㔪࡟ࣇ࢕࣮ࢻࣂࢵࢡࡍࡿࡇ࡜ࡣࠊືసᏳᐃᛶ࡟ඃࢀࠊ㧗ຠ⋡࡞ⓑⰍ LED ࣛࣥࣉࢆᐇ⌧ࡍࡿࡓࡵࡢ➨୍ẁ㝵࡜⪃࠼ࡿࠋᐇ㦂㸸ᐃ࡟⏝࠸ࡓ⺯ගయࡣ 4 ࡘ࠶ࡾࠊ ᗘᾘගࡢᣲືࡀ␗࡞ࡿࠋ ᐃ࡟⏝࠸ࡓ⺯ගయヨᩱࡢⓎගᙉᗘࡢ ᗘ౫Ꮡᛶࢆᅗ 1 ࡟♧ࡍࠋ4 ࡘࡢ⺯ගయࢆ ᗘᾘගࡢ኱ࡁ࠸㡰࡟୪࡭ࡿ࡜௨ୗࡢ࡜࠾ࡾ࡟࡞
ࡿࠋI-YAG 㸺 I’-YAG 㸺 II-YAG 㸺 LuAGࡑࢀࡒࢀ⺯ගయࡢⓎග࢖࢜ࣥ㻔Ce㻕⃰ᗘࡣࠊY ࠶ࡿ࠸ࡣ Lu ࡢࢧ࢖ࢺ࡟࠾࠸࡚ࡑࢀࡒࢀ 3 mol%࡜ࡋࡓࠋ⺯ගయヨᩱࡣࡍ࡭࡚⢊ᮎ࡛ࠊ኱Ẽ୰࡛໬Ꮫⓗ࡟Ᏻᐃ࡛࠶ࡿࠋྛヨᩱ⢊ᮎࡣ XAFS ᐃ࡟⏝࠸ࡿࡓࡵࠊ┤ᚄ 10 mm ࡢ࣌ࣞࢵࢺ࡟ᡂᆺࡋࡓࠋXAFS ࢫ࣌ࢡࢺࣝ ᐃࡣࠊ⏘ᴗ฼⏝ϩࣅ࣮࣒ࣛ࢖ࣥ BL14B2 ࢆ⏝࠸࡚⾜ࡗࡓࠋࡲࡎࠊᐊ ࡛ࠊୖグヨᩱࡢ Ce-L3 ྾཰➃ XAFS ࢫ࣌ࢡࢺࣝࢆ ᐃࡋࡓࠋḟ࡟ࠊప ࠿ࡽᐊ ࡟࠾ࡅࡿ Ce-K ྾཰➃ XAFS ࢫ࣌ࢡࢺࣝࢆ ᐃࡋࡓࠋCe-K ྾཰➃ XAFS ࡟ࡘ࠸࡚ࡣࠊᐊ ࡟࠾࠸࡚ ᐃ᮲௳ࢆ᳨ウࡋࠊḟ࠸࡛ࠊࢡࣛ࢖࢜ࢫࢱࢵࢺࢆ⏝࠸࡚⣙ 20K ࠿ࡽᐊ ࡲ࡛ 7 Ⅼ ᐃ㻔20ࠊ40ࠊ70ࠊ100ࠊ150ࠊ200ࠊ
250K㻕ࡋࡓࠋࡓࡔࡋࠊ ᐃ᫬㛫ࡀ㊊ࡾ࡞࠿ࡗࡓࡓࡵࠊLuAG ࡣࠊᐊ ࡜ 20K ࡛ࡢࡳ ᐃࢆ⾜ࡗࡓࠋᐊ ࡟࠾ࡅࡿ XAFS ࢫ࣌ࢡࢺࣝࡢ XANES 㡿ᇦ࠿ࡽࡑࢀࡒࢀࡢⓎග࢖࢜ࣥࡀ♧ࡍ㟁Ꮚ≧ែ㻔౯ᩘ㻕ࢆࠊࡲࡓࠊEXAFS 㡿ᇦ࠿ࡽⓎග࢖࢜ࣥࡢᒁᡤᵓ㐀ࢆゎᯒࡋࠊࡑࢀࡒࢀࡢ ᗘኚ໬ࢆㄪ࡭ࡓࠋ㍤ᗘ⥔ᣢ⋡䠄㻞㻡䉝ᇶ‽䠅㻝㻜㻜㻤㻜㻵㻙㼅㻭㻳㻵㻓㻙㼅㻭㻳㻵㻵㻙㼅㻭㻳㻸㼡㻭㻳㻢㻜㻠㻜㻞㻜㻜㻜㻡㻜㻝㻜㻜ᗘ䚷䠄䉝䠅㻝㻡㻜㻞㻜㻜ᅗ 1㸬ᐊ ௨ୖ࡟࠾ࡅࡿྛ✀⺯ගయࡢⓎගᙉᗘࡢ ᗘ౫Ꮡᛶ㻔ບ㉳Ἴ㛗 455 nm㻕⤖ᯝ࠾ࡼࡧ⪃ᐹ㸸⺯ගయ୰ࡢ௜άࡉࢀࡿⓎග࢖࢜ࣥࠊ౛࠼ࡤࠊCe3+࢖࢜ࣥࡣᚤ㔞࡞ࡓࡵࠊ◊✲ᐊ࡟࠶ࡿ XRD ➼ࡢศᯒ⿦⨨ࢆ⏝࠸࡚ࡑࡢⓎග࢖࢜ࣥࡢ㟁Ꮚ≧ែࡸࡑࡢᒁᡤᵓ㐀ࢆ┤᥋ⓗ࡟▱ࡿࡇ࡜ࡀ㞴ࡋ࠸ࠋࡋࡓࡀࡗ࡚ࠊᢡゅࠊ⺯ගయࡢⓎග≉ᛶࢆᨵⰋࡋ࡚ࡶࡑࡢせᅉࢆ᫂ࡽ࠿࡟ࡍࡿࡇ࡜ࡀ୍⯡࡟㞴ࡋࡃࠊᨵⰋᣦ㔪࡜ࡋ࡚ⴠ࡜ࡋ㎸ࡴࡇ࡜ࡀ࡛ࡁ࡞࠿ࡗࡓࠋ୍᪉ࠊᨺᑕග࡟ࡼࡿ XAFS ศᯒࡣࡇࡢⓎග࢖࢜ࣥࡢ౯ᩘࡸᒁᡤᵓ㐀➼ࡢṇ☜࡞᝟ሗࡀᚓࡽࢀࡿ၏୍ᙉຊ࡞ศᯒᡭἲ࡛࠶ࡾࠊタィ࠶ࡿ࠸ࡣᨵⰋᣦ㔪ࢆᵓ⠏ࡀヨࡳࡽࢀ࡚ࡁࡓ[4]ࠋ
ᮏ◊✲࡛ࡣ⺯ගయࡢ ᗘᾘගᨵⰋࢆ┠ⓗ࡜ࡋ࡚௨ୗ࡟♧ࡍࢹࣂ࢖࣮࣮࣡ࣛᅉᏊࡢ᝟ሗྲྀᚓࢆヨࡳࡓࠋձ 㟼ⓗ࡞ᵓ㐀ࡢ஘ࢀ㸸Ce ࢖࢜ࣥࡀ YAG ẕయ⤖ᬗ࡟௜άࡉࢀࡿࡇ࡜࡟ࡼࡾࠊⓎග࢖࢜ࣥ㻔Ce3+㻕࿘ࡾࡢẕయᵓᡂඖ⣲㻔O, Y, Al㻕ࡀ⌮᝿࡜ࡉࢀࡿẕయ⤖ᬗ᱁ᏊⅬ࠿ࡽᗄఱᏛⓗ࡟ࡎࢀ࡚⏕ࡌࡿ஘ࢀࢆ࠸࠸ࠊప 㻔㸺20K㻕࡟ࡋ࡚⇕᣺ືࢆᢚ࠼ࡿࡇ࡜࡟ࡼࡾほ ࡉࢀࡿࠋղ ⇕ⓗ㻔ືⓗ㻕࡞ᵓ㐀ࡢ஘ࢀ㸸Ce ࢖࢜ࣥ࿘ࡾẕయ⤖ᬗඖ⣲ࡀ⇕᣺ື࡟ࡼࡾ᱁ᏊⅬ࠿ࡽࡎࢀ࡚⏕ࡌࡿ஘ࢀࢆ࠸࠸ࠊCe3+࢖࢜ࣥࡢᵓ㐀ኚ໬ࡢ ᗘ౫Ꮡᛶࢆ ᐃࡋࠊ᳨ウࡉࢀࡿ1ࠋ ᗘᾘගࡀࣇ࢛ࣀࣥࢆ௓ࡋ࡚࢚ࢿࣝࢠ࣮ࡀ୍ᩓࡋ࡚⏕ࡌࡿ࠿࡝࠺࠿ㄪ࡭ࡿࠋࡇࢀࡽ ᗘᾘග࡟ᙉࡃ┦㛵ࡍࡿ࡜ண᝿ࡉࢀࡿࣃ࣓࣮ࣛࢱ࣮ࢆ᥈ࡋฟࡋࠊ㔪ࢆᵓ⠏ࡋࡓ࠸ࠋᗘᾘගᨵⰋࡢタィᣦึࡵ࡟ࠊᐊ ࡟࠾ࡅࡿ XAFS ࢫ࣌ࢡࢺࣝࡢ XANES 㡿ᇦ࠿ࡽⓎග࢖࢜ࣥࡀ♧ࡍ㟁Ꮚ≧ែ㻔౯ᩘ㻕ࢆほᐹࡋࡓ࡜ࡇࢁࠊI-YAG ࡟ Ce㻔IV㻕O2 ࡀ୙⣧≀࡜ࡋ࡚ྵࡲࢀ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡗࡓࠋࡇࡢࡇ࡜ࡣࡑࡢᚋࡢ ᐃ࣭ゎᯒ࡟ᨭ㞀ࡀ࠶ࡿ࡜ุ᩿ࡋࡓࠋࡑࡇ࡛ࠊ ᗘ≉ᛶࡀ I ࡜ II ࡢ୰㛫࡟࠶ࡗࡓ I’-YAGࢆ I-YAG ࡢ௦ࢃࡾ࡜ࡋࠊCe㻔IV㻕O2 ࡀྵࡲࢀ࡚࠸࡞࠸ࡇ࡜ࢆ☜ㄆࡋࠊ ᐃ࣭ゎᯒࢆ⥆⾜ࡋࡓࠋᐊ ࡟࠾ࡅࡿ EXAFS 㡿ᇦࢆ⏝࠸࡚Ⓨග࢖࢜ࣥࡢᒁᡤᵓ㐀ࢆゎᯒࡋࡓ࡜ࡇࢁࠊI’-YAG ࡜ẚ㍑ࡋ࡚Ⓨගᙉᗘ࣭ ᗘ≉ᛶ࡟ඃࢀࡓ II-YAG ࡣࠊືᚄᵓ㐀㛵ᩘ࡟࠾࠸࡚ࣆ࣮ࢡᙉᗘࡀ㧗ࡃࠊⓎග࢖࢜ࣥࡢ Ce ࡢ࿘ࡾ࡟࠶ࡿཎᏊࡢ͆⇕ⓗ࡞஘ࢀ͇ࡀᑠࡉࡃࠊ⇕ⓗ࡞ᵓ㐀஘ࢀࡀᢚ࠼ࡽࢀ࡚࠸ࡓ㻔ᅗ 2㻕ࠋࡲࡓࠊII-YAG ࡼࡾ ᗘ≉ᛶ࡟ඃࢀࡓ LuAG ࡣࠊ➨୍㏆᥋ࣆ࣮ࢡࡀẚ㍑ⓗ㧗ࡃほ ࡉࢀࡓࠋࡍ࡞ࢃࡕࠊᗘ≉ᛶࡀඃࢀࡿ⺯ගయ࡯࡝ Ce ࿘㎶ࡢཎᏊࡢ͆⇕ⓗ࡞஘ࢀ͇ࡀᑠࡉ࠸ࠊ࡜࠸࠺ഴྥࡀほᐹࡉࢀࡓࠋࡓࡔࡋࠊ ᗘᾘගࡀࣇ࢛ࣀࣥࢆ௓ࡋ࡚࢚ࢿࣝࢠ࣮ࡀ୍ᩓࡍࡿࡇ࡜࡟ࡼࡗ࡚⏕ࡌࡿ࠿࡝࠺࠿ࡢၥ࠸
ࡣ᭦࡟᳨ウࢆせࡍࡿࠋHigh YAG
Low YAGCe K-edge|FT|Ce-Al, YCe-O

0123456R (䊅)ᅗ 2㸬20K ࡟࠾ࡅࡿ II-YAG㻔High YAG㻕࡜ I’-YAG㻔Low YAG㻕ࡢືᚄᵓ㐀㛵ᩘࡢẚ㍑⇕ⓗ࡞ᵓ㐀ࡢ஘ࢀࢆᢚ࠼ࡓ 20K ࡟࠾࠸࡚ࠊII-YAG ࡣ I’-YAG ࡼࡾࡶ Ce ࢖࢜ࣥ࿘ࡾࡢ㟼ⓗ஘ࢀࡀᑠࡉ࠿ࡗࡓࠋ㟼ⓗ஘ࢀࡀᑠࡉࡃࠊCe ࢖࢜ࣥ࿘ࡾࡢ࢖࢜ࣥࡀẕయ⤖ᬗࡢつ๎᱁ᏊⅬ࠿ࡽࡢࡎࢀࡀᑠࡉࡃࠊ⛛ᗎࡔࡗ࡚࠸ࡿ࡯࡝ࠊCe ࢖࢜ࣥࡣඃࢀࡓⓎගᙉᗘࠊࡦ࠸࡚ࡣ ᗘ≉ᛶࢆ♧ࡍ࡜⪃࠼ࡓࠋࡲࡓࠊ➨୍㓄఩ᅪࡢࣆ࣮ࢡᙉᗘࡢ ᗘኚ໬ࡣᑠࡉࡃࠊ୍᪉ࠊ➨஧㓄఩ᅪࡢࣆ࣮ࢡᙉᗘࡢ ᗘኚ໬ࡣ኱ࡁ࠿ࡗࡓࠋ➨୍㓄఩ᅪࡣཎᏊ㛫ࡢ⤖ྜ㍈ࡢࡳ࡟࠾ࡅࡿపḟඖࡢ⇕᣺ືࢆࠊ➨஧㓄఩ᅪࡣ⤖ྜゅࡢኚ໬ࢆࡶྵࡵࡓ୕ḟඖⓗ⇕᣺ືࢆ⪃៖ࡋࡘࡘࠊࡑࢀࡒࢀ ᗘ≉ᛶ࡜ࡢ㛵㐃࡙ࡅࢆὀពࡋ࡞ࡀࡽヲ⣽࡟᳨ウࡋ࡚࠸ࡃᚲせࡀ࠶ࡿ࡜♧၀ࡉࢀࡓࠋ

1ᗘᾘගࡣࡶ࡜ࡼࡾࠊ ᗘୖ᪼࡟క࠺Ⓨගࣆ࣮ࢡࡢἼ㛗ࢩࣇࢺࡀືⓗ࡞ᵓ㐀ࡢ஘ࢀ࡜㛵㐃࡙ࡅࡽࢀࡿ࠿࡝࠺࠿⯆࿡ࡀࡶࡓࢀࡿࠋ௒ᚋࡢㄢ㢟㸸
Ghigna ࡽࡣࠊEXAFS ࡼࡾồࡵࡓࢹࣂ࢖࣮࣮࣡ࣛᅉᏊࡀ㠀ᖖ࡟ᑠࡉࡃࠊࡑࡢ ᗘ౫Ꮡᛶࡀᐊ ࡲ࡛ᑠࡉ࠸࡜࠸࠺⤖ᯝ࡟ᇶ࡙࠸࡚ẕయ⤖ᬗ㻔YAG㻕୰ࡢ Ce3+࢖࢜ࣥ࿘ࡾࡢ㓄⨨⎔ቃࡀᅛ࠸࡜⤖ㄽ࡙ࡅ࡚࠸ࡿ[3]ࠋࡇࢀࡣࠊBachmann ࡽࡀሗ࿌ࡋࡓ⣙ 150ºC ࡲ࡛ YAG:Ce ࡢ ᗘᾘගࡀㄆࡵࡽࢀ࡞࠸⤖ᯝ[5]࡜୍⮴ࡋࠊࢹࣂ࢖࣮࣮࣡ࣛᅉᏊ࡜ ᗘᾘග࡜ࡢ㛵㐃௜ࡅࡀᮇᚅࡉࢀࡿࠋ௒ᚋࡣࠊᚓࡽࢀࡓࢫ࣌ࢡࢺࣝࡢ࣮࢝ࣈࣇ࢕ࢵࢸࣥࢢࢆ⾜࠸ࠊࢹࣂ࢖࣮࣮࣡ࣛᅉᏊࡢᐃ㔞ⓗ࡞ゎᯒࢆ⾜࠺ࡇ࡜࡟ࡼࡾᐊ௨ୖ࡟࠾ࡅࡿࢹࣂ࢖࣮࣮࣡ࣛᅉᏊ࡜⺯ගయࡀ♧ࡍⓎගᙉᗘࡢ୧ ᗘኚ໬࡜ẚ㍑ࡋࠊ ᗘᾘග࡟ᙉࡃ┦㛵ࡍࡿࣃ࣓࣮ࣛࢱ࣮ࢆぢฟࡋࠊ⺯ගయࡢ ᗘᾘග࣓࢝ࢽࢬ࣒ࢆゎ᫂ࡍࡿᡭ᥃࠿ࡾࢆ᥈ࡿࠋࡉࡽ࡟ 3 ✀㢮ࡢ⺯ගయࡀ♧ࡍ ᗘ≉ᛶࡢᕪࢆὀ┠ࡋࠊ ᗘ≉ᛶᨵⰋࡢタィᣦ㔪ᵓ⠏ࢆ┠ᣦࡍࠋບ㉳ග↷ᑕ࡟࠾ࡅࡿⓎග࢖࢜ࣥࡢ౯ᩘኚ໬ࡀཬࡰࡍᾘගຠᯝࢆ᳨ウࡍࡿᚲせࡀ⏕ࡌࡓ࡜ࡁࠊ⣙450 nm ࡢྍどගࢆⓎࡍࡿ㟷Ⰽ LED ග※ࢆᣢࡕ㎸ࢇ࡛ບ㉳ࡋࡓ≧ែࡢ⺯ගయ࡟࠾ࡅࡿ EXAFS ཬࡧXANES ࡢ ᗘ౫Ꮡᛶࢆㄪ࡭ࡿࠋཧ⪃ᩥ⊩㸸
[1] ୖᆤᏹ㐨, ኴ⏣ಇ᫂, ࢩࣥࢡࣟࢺࣟࣥᨺᑕග, ᒾἼ᭩ᗑ, ᮾி, 5 ❶, 64, 㻔2005㻕.
[2] T. Ishii, in “Principle of the Theory of EXAFS”, Shokabo, Tokyo, Chapter 4, 83, 㻔1994㻕㻚
[3] P. Ghigna, S. Pin, C. Ronda, A. Speghini, F. Piccinelli, M. Bettinelli, Optical Materials, 34, 19, 㻔2011㻕.
[4] Y. Shimomura, T. Honma, M. Shigeiwa, T. Akai, K. Okamoto, N. Kijima, J. Electrochem. Soc., 154, J35,
㻔2007㻕㻚
[5] V. Bachmann, C. Ronda, A. Meijerink, Chem. Mater., 21, 2077, 㻔2009㻕㻚