JPWO2013058065A1 - 発光素子、その製造方法、及び発光デバイス - Google Patents
発光素子、その製造方法、及び発光デバイス Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 75
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- 229910052688 Gadolinium Inorganic materials 0.000 claims abstract description 26
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 26
- 229910052765 Lutetium Inorganic materials 0.000 claims abstract description 23
- 150000001875 compounds Chemical class 0.000 claims abstract description 17
- 229910052735 hafnium Inorganic materials 0.000 claims abstract description 17
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 16
- 229910052769 Ytterbium Inorganic materials 0.000 claims abstract description 11
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 11
- 229910052718 tin Inorganic materials 0.000 claims abstract description 6
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 28
- 238000005245 sintering Methods 0.000 claims description 15
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
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- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000000608 laser ablation Methods 0.000 description 2
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- -1 B 2 O 3 Inorganic materials 0.000 description 1
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
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Abstract
Description
まず、原料として、高純度のLa(OH)3、Gd2O3、Y2O3、ZrO2、HfO2、SnO2、Bi2O3を準備した。これらの原料を下記の表1に示す組成A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。この仮焼物を、水および有機分散剤および有機バインダーとともにボールミルに入れ、12時間湿式粉砕した。次に、得られた粉砕物を、厚み60μmのグリーンシートに成形した。得られたグリーンシートを10mm四方となるよう切り出し、それを15枚重ねて2t/cm2の圧力で加圧することで、10mm四方、厚み約0.8mmの第1の成形体を作製した。
原料として、高純度のLa(OH)3、Gd2O3、Y2O3、ZrO2、HfO2、SnO2、Bi2O3を準備しこれらの原料を表1に示す組成C、またはDとなるように秤量した以外は実施例1と全く同じ方法にて、組成Cからなるt=0.5mmの焼結体基板(サンプル4)、組成Dからなるt=0.5mmの焼結体基板(サンプル5)、組成Cと組成Dとを積層焼結させてなるt=1.0mmの積層発光素子(サンプル6)を作製した。
実施例1におけるグリーンシートの積層数において組成Aを10層、組成Bを20層とした以外は実施例1と全く同じ方法にて新たな積層発光素子を作製し、サンプル7とした。同様に、組成Aを20層、組成Bを10層とした積層発光素子も作製し、サンプル8とした。サンプル7、8の相関色温度(K)、duv、平均演色評価指数を表2に示す。
実施例1と同様の方法で組成Aからなるt=0.5mmの焼結体基板、組成Bからなるt=0.5mmの焼結体基板を作製し、それらを透明エポキシ樹脂にて張り合わせた□10mm、厚み1.0mmの比較サンプル1を得た。
・まず、波長360nmのUV-LEDチップを準備し、そのチップ上に試料を配置した状態でUV-LEDの光を試料に照射する。
・試料の前面部から出射される全ての光を積分球に取り込み、株式会社浜松ホトニクス社製のマルチチャンネル分光器(PMA−12)にて発光スペクトル強度を測定する。
・得られた発光スペクトルを可視光域400nm〜700nmの範囲で波長積分し、発光強度とする。
11…第1の波長変換部
12…第2の波長変換部
2…光源
21…n型層
22…p型層
23…発光層
24…第1の電極
25…第2の電極
3…リフレクタ
4…基板
5…エピタキシャルウエハ
6…第1の発光デバイス
7…第2の発光デバイス
8…第3の発光デバイス
9…第4の発光デバイス
Claims (8)
- 第1の波長変換部と、
前記第1の波長変換部の上に配された第2の波長変換部と、
を備え、
前記第1の波長変換部は、A1B1Ow1(但し、A1は、La,Y,Gd,Yb及びLuからなる群から選ばれた少なくとも一種と、0.001モル%〜5モル%のBiとからなり、B1は、Sn,Zr及びHfからなる群から選ばれた少なくとも一種からなり、W1は、電気的中性を保つための正の数である。)で表されるパイロクロア型化合物を主成分とするセラミックスを含み、
前記第2の波長変換部は、A2B2Ow2(但し、A2は、La,Y,Gd,Yb及びLuからなる群から選ばれた少なくとも一種と、0.001モル%〜5モル%のBiとからなり、B2は、Sn,Zr及びHfからなる群から選ばれた少なくとも一種からなり、W2は、電気的中性を保つための正の数である。)で表されるパイロクロア型化合物を主成分とするセラミックスを含み、
前記A1におけるLaの含有量は、前記A2におけるLaの含有量よりも多く、
前記A2におけるY,Gd及びLuの含有量は、前記A1におけるY,Gd及びLuの含有量よりも多い、発光素子。 - 前記A1は、Laと、0.001モル%〜5モル%のBiとからなり、
前記B1はSn,Zr及びHfからなる群から選ばれた少なくとも一種からなり、
前記A2は、Gd及びYから選ばれた少なくとも一種と、0.001モル%〜5モル%のBiとからなり、
前記B2はZr及びHfから選ばれた少なくとも一種からなる、請求項1に記載の発光素子。 - 波長が360nmの光を照射したときに前記第1の波長変換部から出射される光と前記第2の波長変換部から出射される光との混合光が白色である、請求項1または2に記載の発光素子。
- 前記第1の波長変換部と、前記第2の波長変換部との間に設けられた相互拡散層をさらに備える、請求項1〜3のいずれか一項に記載の発光素子。
- 第1の蛍光体またはその前駆体を含む第1のセラミックグリーンシートを形成する工程と、
第2の蛍光体またはその前駆体を含む第2のセラミックグリーンシートを形成する工程と、
前記第1のセラミックグリーンシートと前記第2のセラミックグリーンシートとを積層し、積層体を作製する工程と、
前記積層体を焼結させることにより、前記第1のセラミックグリーンシートから形成された第1の波長変換部と、前記第2のセラミックグリーンシートから形成され、前記第1の波長変換部と接合された第2の波長変換部とを有する発光素子を得る焼結工程と、
を備える、発光素子の製造方法。 - 前記焼結工程において、前記第1の波長変換部と前記第2の波長変換部との間に相互拡散層が形成されるように前記積層体を焼結させる、請求項5に記載の発光素子の製造方法。
- 前記第1の蛍光体は、A1B1Ow1(但し、A1は、La,Y,Gd,Yb及びLuからなる群から選ばれた少なくとも一種と、0.001モル%〜5モル%のBiとからなり、B1は、Sn,Zr及びHfからなる群から選ばれた少なくとも一種からなり、W1は、電気的中性を保つための正の数である。)で表されるパイロクロア型化合物を主成分とするセラミックスからなり、
前記第2の蛍光体は、A2B2Ow2(但し、A2は、La,Y,Gd,Yb及びLuからなる群から選ばれた少なくとも一種と、0.001モル%〜5モル%のBiとからなり、B2は、Sn,Zr及びHfからなる群から選ばれた少なくとも一種からなり、W2は、電気的中性を保つための正の数である。)で表されるパイロクロア型化合物を主成分とするセラミックスからなり、
前記A1におけるLaの含有量は、前記A2におけるLaの含有量よりも多く、
前記A2におけるY,Gd及びLuの含有量は、前記A1におけるY,Gd及びLuの含有量よりも多い、請求項5または6に記載の発光素子の製造方法。 - 請求項1〜4のいずれか一項に記載の発光素子と、前記発光素子の励起光を発光素子に対して出射する光源とを含む、発光デバイス。
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