JPWO2019038967A1 - 発光セラミックス及び波長変換装置 - Google Patents
発光セラミックス及び波長変換装置 Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 62
- 150000001875 compounds Chemical class 0.000 claims abstract description 9
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 7
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 7
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 6
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 6
- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 5
- 229910052765 Lutetium Inorganic materials 0.000 claims abstract description 5
- 229910052769 Ytterbium Inorganic materials 0.000 claims abstract description 5
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 5
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 5
- 229910052718 tin Inorganic materials 0.000 claims abstract description 5
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000001782 photodegradation Methods 0.000 description 19
- 239000000203 mixture Substances 0.000 description 14
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- 150000002500 ions Chemical class 0.000 description 9
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- -1 and M2 is Inorganic materials 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
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- 229920005989 resin Polymers 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000002801 charged material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
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Abstract
Description
本発明の発光セラミックスの製造方法を説明する。
図4は、本発明の一実施形態としての波長変換装置を示す概略構成図である。
次に本発明の発光セラミックスの実験例を述べることにより、本発明をより詳細に説明する。なお、本発明は以下の実験例に限定されるものではない。
原料として、La(OH)3、Gd2O3、Y2O3、Yb2O3、Lu2O3、ZrO2、HfO2、SnO2、Nb2O5、Ta2O5、Sb2O3及びBi2O3を用意した。これらの原料を、下記の表1のモル比で示す組成となるように秤量し、ボールミルで20時間湿式混合した。得られた混合物を乾燥させた後、1300℃で3時間仮焼し、仮焼物を得た。得られた仮焼物を、水及び有機分散剤とともにボールミルに入れ、12時間湿式粉砕した。得られた粉砕物を用い、湿式成形法により、直径30mm及び厚さ5mmの円盤状の形状となるように成形した。得られた成形物を、該成形物と同じ組成からなる粉体にうずめ、酸素雰囲気下(約98体積%酸素濃度)で、1700℃の温度にて20時間焼成した。それによって焼結体を得た。
得られた評価用のサンプルについて、フォトルミネッセンス測定装置(西進商事株式会社製)を用い、波長325nm及び出力10mWのHe−Cdレーザーをサンプル表面に120分間照射した。この際のサンプルから得られる発光強度の経時変化を測定した。発光強度のモニタリング波長は、580nmとした。図2に、測定結果の例として、サンプルNo.1及びサンプルNo.5の発光強度の経時変化を示す。図2から明らかなように、発光強度の低下は、光照射開始後数分間において特に著しく、その後時間とともに低下量は小さくなり、飽和する傾向を示した。本実験例では、相対発光強度により各サンプルの光劣化を評価した。ここで、相対発光強度とは、照射直後の発光強度に対する、120分照射後の発光強度の割合をいう。このようにして測定された相対発光強度を下記の表1に併せて示す。
実験例1と同様にして、下記の表2、表3及び表4に示すサンプルNo.15〜サンプルNo.42の評価用サンプルを得た。
2…光源
3…リフレクタ
4…基板
6…波長変換装置
Claims (6)
- 一般式M1xM2YM3ZOW(ただし、M1は、La、Y、Gd、Yb及びLuからなる群から選ばれた少なくとも1種の元素であり、M2は、Zr、Sn及びHfからなる群から選択された少なくとも1種の元素であり、M3は、Ta、Nb及びSbからなる群から選択された少なくとも1種の元素であり、X、Y、Z及びWは、電気的中性を保つための正の数)100モル%に対し、Biが0.01モル%以上含有されている、パイロクロア型化合物からなる発光セラミックスであって、
X+Y+Z=2.0とした場合に、0.005≦Z≦0.2であり、3X+4Y+5Zが7.02以下である、発光セラミックス。 - 3X+4Y+5Zが、6.92以上である、請求項1に記載の発光セラミックス。
- Zが0.02以上である、請求項1または2に記載の発光セラミックス。
- Zが0.05以上である、請求項3に記載の発光セラミックス。
- 前記一般式M1xM2YM3ZOW100モル%に対し、前記Biが5モル%以下の割合で含有されている、請求項1〜4のいずれか1項に記載の発光セラミックス。
- 請求項1〜5のいずれか1項に記載の発光セラミックスと、
前記発光セラミックスに紫外線を照射する光源と、
を備える波長変換装置。
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