JP7390599B2 - 発光装置及びそれを用いた医療装置 - Google Patents
発光装置及びそれを用いた医療装置 Download PDFInfo
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- JP7390599B2 JP7390599B2 JP2020571103A JP2020571103A JP7390599B2 JP 7390599 B2 JP7390599 B2 JP 7390599B2 JP 2020571103 A JP2020571103 A JP 2020571103A JP 2020571103 A JP2020571103 A JP 2020571103A JP 7390599 B2 JP7390599 B2 JP 7390599B2
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Description
本実施形態に係る発光装置は、光線力学療法に使用される発光装置である。図1乃至図4に示すように、発光装置1,1A,1B,1Cは、固体発光素子2と、第一の波長変換光7を放つ第一の蛍光体4を含む波長変換体3,3Aとを少なくとも備えている。発光装置1,1A,1B,1Cは、固体発光素子2から放射された一次光6が波長変換体3,3Aに入射すると、波長変換体3,3Aが蛍光を放射するものである。
固体発光素子2は、一次光6を放射する発光素子である。このような固体発光素子2としては、例えば、面発光レーザーダイオード等のレーザー素子が用いられる。1つのレーザー素子が放射するレーザー光の出力エネルギーは、例えば、0.1W以上であることが好ましく、1W以上であることがさらに好ましく、5W以上であることがさらに好ましい。また、固体発光素子2が放射するレーザー光のエネルギー密度は、例えば、0.5W/mm2以上であることが好ましく、2W/mm2以上であることがより好ましく、10W/mm2以上であることがさらに好ましい。後述するように、波長変換体3,3A中の蛍光体は、高出力のレーザー光を高効率で波長変換でき、さらに高出力のレーザー光に対しても劣化し難い。そのため、固体発光素子2が放射するレーザー光のエネルギー密度が0.5W/mm2以上であることにより、発光装置は高出力な近赤外光を放射することが可能となる。
図1乃至図4に示すように、波長変換体3,3Aは、一次光6の受光により、一次光6よりも長波長の蛍光を放射する。図1及び図2に示す波長変換体3,3Aは、正面3aで一次光6を受光し、背面3bから蛍光を放射する構成となっている。これに対し、図3及び図4に示す波長変換体3,3Aは、正面3aで一次光6を受光し、同じ正面3aで蛍光を放射する構成となっている。
次に、本実施形態に係る医療装置について説明する。具体的には、医療装置の一例として、発光装置を備えた内視鏡、及び当該内視鏡を用いた内視鏡システムについて説明する。
次に、本実施形態に係る光線力学療法について説明する。本実施形態の光線力学療法は、上述の発光装置1,1A,1B,1C又は医療装置を用いる方法である。具体的には、本実施形態の光線力学療法は、病巣部の位置を特定する工程と、被検体に光感受性物質を投与する工程と、光感受性物質が接触した病巣部に、第一の波長変換光7を照射する工程と、を有する。
(実施例1)
固相反応を利用する調製手法を用いて、実施例1で使用する酸化物蛍光体を合成した。実施例1の蛍光体は、(Y0.98Ce0.02)3Mg2(AlO4)(SiO4)2の組成式で表される酸化物蛍光体である。なお、酸化物蛍光体を合成する際、以下の化合物粉末を主原料として使用した。
酸化イットリウム(Y2O3):純度3N、信越化学工業株式会社
酸化セリウム(CeO2):純度4N、信越化学工業株式会社
酸化アルミニウム(θ-Al2O3):純度>4N5、住友化学株式会社
酸化マグネシウム(MgO):純度4N、株式会社高純度化学研究所
二酸化珪素(SiO2):純度>3N、日本アエロジル株式会社
フッ化アルミニウム(AlF3):純度3N、株式会社高純度化学研究所
炭酸カリウム(K2CO3):純度2N5、関東化学株式会社
固相反応を利用する調製手法を用いて、参考例2及び参考例3で使用する窒化物蛍光体を合成した。参考例2の蛍光体は、La2.991Ce0.009(Si,Al)6(N,O)11-xの組成式で表される窒化物蛍光体である。また、参考例3の蛍光体は、La2.982Ce0.012(Si,Al)6(N,O)11-xの組成式で表される窒化物蛍光体である。
固相反応を利用する調製手法を用いて、参考例4で使用する酸化物蛍光体を合成した。参考例4の蛍光体は、(Ca0.1Sr0.897Eu0.003)Sc2O4の組成式で表される酸化物蛍光体である。なお、酸化物蛍光体を合成する際、以下の化合物粉末を主原料として使用した。
炭酸カルシウム(CaCO3):純度3N、和光純薬工業株式会社
炭酸ストロンチウム(SrCO3):純度3N、和光純薬工業株式会社
酸化スカンジウム(Sc2O3):純度3N、信越化学工業株式会社
酸化ユウロピウム(Eu2O3):純度3N、信越化学工業株式会社
固相反応を利用する調製手法を用いて、参考例5で使用する窒化物蛍光体を合成した。参考例5の蛍光体は、(La0.896Gd0.1Ce0.004)3(Si,Al)6(N,O)11-xの組成式で表される窒化物蛍光体である。
固相反応を利用する調製手法を用いて、実施例6で使用する酸化物蛍光体を合成した。実施例6の蛍光体は、Gd3(Ga0.97Cr0.03)2Ga3O12の組成式で表される酸化物蛍光体である。また、実施例6の蛍光体は、Cr3+賦活蛍光体である。なお、実施例6の酸化物蛍光体を合成する際、以下の化合物粉末を主原料として使用した。
酸化ガドリニウム(Gd2O3):純度3N、和光純薬工業株式会社
酸化ガリウム(Ga2O3):純度4N、和光純薬工業株式会社
酸化クロム(Cr2O3):純度3N、株式会社高純度化学研究所
固相反応を利用する調製手法を用いて、実施例7で使用する酸化物蛍光体を合成した。実施例7の蛍光体は、(Gd0.75La0.25)3(Ga0.97Cr0.03)2Ga3O12の組成式で表される酸化物蛍光体である。また、実施例7の蛍光体は、Cr3+賦活蛍光体である。そして、実施例7の酸化物蛍光体を合成する際、以下の化合物粉末を主原料として使用した。
酸化ガドリニウム(Gd2O3):純度3N、和光純薬工業株式会社
酸化ランタン(La2O3):純度3N、和光純薬工業株式会社
酸化ガリウム(Ga2O3):純度4N、和光純薬工業株式会社
酸化クロム(Cr2O3):純度3N、株式会社高純度化学研究所
(結晶構造解析)
実施例1の蛍光体の結晶構造を、X線回折装置(X‘Pert PRO;スペクトリス株式会社、PANalytical社製)を用いて評価した。
次に、実施例1の蛍光体の励起特性と蛍光特性を、分光蛍光光度計(FP-6500;日本分光株式会社製)を用いて評価した。図9では、実施例1の蛍光体の励起スペクトル及び蛍光スペクトルを示す。なお、蛍光スペクトル測定時の励起波長は450nmとし、励起スペクトル測定時のモニター波長は蛍光ピーク波長とした。また、図9において、蛍光スペクトルと励起スペクトルは、いずれもピークを1として規格化して示している。
2 固体発光素子
3,3A 波長変換体
4 第一の蛍光体
6 一次光
7 第一の波長変換光
8 第二の蛍光体
9 第二の波長変換光
Claims (7)
- 複数の固体発光素子と、
第一の波長変換光を放つ第一の蛍光体を含む波長変換体と、
を備え、
前記第一の蛍光体は、ガーネットの結晶構造を有する蛍光体であり、かつ、Ce 3+ 賦活蛍光体、Eu 2+ 賦活蛍光体又はCr 3+ 賦活蛍光体であり、
各固体発光素子は、エネルギー密度が0.5W/mm2以上である一次光を放ち、
複数の前記固体発光素子は同一の種類であり、各固体発光素子は430nm以上480nm以下、500nm以上560nm以下、又は600nm以上700nm以下の波長範囲内に強度最大値を有する前記一次光を放射し、
前記第一の波長変換光は、少なくとも700nm以上800nm未満の波長範囲全体に亘って光成分を有し、
前記波長変換体から発せられる蛍光のエネルギーは100mW以上である、光線力学療法に使用される発光装置。 - 前記第一の波長変換光は、600nm以上800nm以下の波長範囲全体に亘って光成分を有する、請求項1に記載の発光装置。
- 前記波長変換体は、前記固体発光素子が発する前記一次光を吸収して可視光である第二の波長変換光を放つ第二の蛍光体をさらに含む、請求項1又は2に記載の発光装置。
- 前記第一の蛍光体は、前記一次光及び前記第二の波長変換光の少なくとも一方を吸収することで前記第一の波長変換光を放つ、請求項3に記載の発光装置。
- 前記第二の蛍光体が放つ蛍光のピーク波長は、500nm以上700nm以下の波長範囲内であり、
前記固体発光素子は、励起源として青色レーザー素子を備える、請求項3又は4に記載の発光装置。 - 前記第一の波長変換光は、蛍光ピークが700nm以上1000nm以下の波長範囲内にある、請求項1乃至5のいずれか一項に記載の発光装置。
- 請求項1乃至6のいずれか一項に記載の発光装置を備える、医療装置。
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