NDLI: Photoluminescence and scintillation properties of Yb 2+ -doped NaX (X = Cl, Br, I) crystals

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Photoluminescence and scintillation properties of Yb 2+ -doped NaX (X = Cl, Br, I) crystals

Content Provider	Semantic Scholar
Author	Sekine, Dai Fujimoto, Yutaka Koshimizu, M. Nakauchi, Daisuke Yanagida, Takayuki Asai, Keisuke
Copyright Year	2018
Abstract	Ybの 5d–4f 遷移発光は,スピン許容および禁制遷移発光の 2 種類に分類される.これらは, 電子の一重項 5d 励起状態に遷移後,基底状態への異なる遷移挙動につながる.スピン反転することなく直接基底状態に遷移場合がスピン許容遷移発光であり,項間交差を経てスピン反転しながら基底状態に遷移する場合がスピン禁制遷移発光である.この 2 つの発光のうち,母材料によって,いずれかが支配的に観測される.SrCl2[1]や NaCl[2]の場合では両者を観測され,MgF2[3] や CaF2[4]ではスピン禁制遷移発光のみが観測される.どのような母材料でどちらの発光が支配的に生ずるかはいまだ解明されていない.本研究では,室温で 2 種類の発光が観測される NaCl[2] に着目し,Ybを添加したNaX (X =Cl, Br, I)に関して,発光およびシンチレーション特性を調べ, 各母材料間で比較を行った. 試料作製には純度99.9%以上の各種ハロゲン化物粉末を用いた.原材料を量論比で混合し,真空中で 300–500°Cで 24 h 脱水したのち,石英アンプル管中に封入して Bridgman 法で結晶育成を行った.得られた結晶を切断・研磨したのち, フォトルミネッセンス(PL)スペクトル,X 線ラジオルミネッセンス(XRL)スペクトル,シンチレーション減衰プロファイル,および線照射波高スペクトルを測定した.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://confit.atlas.jp/guide/event-img/jsap2018s/19p-P7-12/public/pdf?type=in
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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