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摘要


本篇是根據修飾過的液―固―溶液合成策略,利用水熱合成法製備不同摻雜離子與摻雜濃度的六方相β-NaYF4奈米棒,並利用X光繞射、掃描電子顯微術與光致螢光光譜來鑑定這些樣品。在980 nm的雷射照射下,β-NaYF4:xYb^(3+)/yEr^(3+)(x/y = 18/2 or 60/2 mol %)奈米棒的光致螢光性質顯示Yb^(3+)/Er^(3+)離子對特徵的上轉換發光。藉由改變Yb^(3+)的摻雜濃度,摻Yb^(3+)/Er^(3+)β-NaYF4奈米棒分別發出綠光與紅光。此外,在405 nm的雷射照射下,β-NaYF4:xEu^(3+)(x = 1, 5, 10, 15 mol %)奈米棒的光致螢光性質顯示Eu^(3+)(5DJ → 7Fj,J = 0, 1, 2; J' = 0, 1, 2, 3, 4)特徵的下轉換發光,由於交叉弛豫過程,來自於5D1和5D2高能階躍遷的放射隨著Eu^(3+)濃度的增加而減弱。

並列摘要


Both upconversion and down conversion β-NaYF4 hexagonal nanorods with different dopant ions and doping levels have been hydrothermally synthesized according to the modified liquid-solid-solution (LSS) synthetic strategy. X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectra were used to characterize the samples. The photoluminescence properties of β-NaYF4: xYb^(3+)/yEr^(3+) (x/y = 18/2 or 60/2 mol %) nanorods exhibit the characteristic upconversion emissions of Yb^(3+)/Er^(3+) ion pairs under the excitation using a 980 nm CW semiconductor diode laser. The luminescence colors of the compounds show green and red luminescence by changing the doping levels of Yb^(3+). Furthermore, the photoluminescence properties of β-NaYF4: xEu^(3+) (x = 1, 5, 10, 15 mol %) exhibit the characteristic down conversion emissions of Eu^(3+) (5DJ → 7Fj,J = 0, 1, 2; J' = 0, 1, 2, 3, 4) under 405 nm excitation, the emissions from high energy level transitions (5D1 and 5D2) are impaired with increasing Eu^(3+) doping level due to the cross-relaxation process.

被引用紀錄


劉浩宇(2014)。應用導模共振光柵結構提升稀土奈米粒子 之上轉換螢光訊號〔碩士論文,國立中正大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0033-2110201614000167

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