Tb<sup>3+</sup> ion doping into Al<sub>2</sub>O<sub>3</sub>: Solubility limit and luminescence properties

DOI Web Site Web Site Web Site Web Site 被引用文献6件 参考文献30件

抄録

<jats:title>Abstract</jats:title> <jats:p>Tb<jats:sup>3+</jats:sup>-activated Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> phosphors with a molar ratio of <jats:inline-formula> <jats:tex-math><?CDATA $\text{Al}:\text{Tb} = (1 - x):x$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="RP160339if001.gif" xlink:type="simple" /> </jats:inline-formula> are synthesized by metal organic decomposition (<jats:italic>x</jats:italic> = 0–0.15) and subsequent calcination at <jats:italic>T</jats:italic> <jats:sub>c</jats:sub> = 200–1200 °C for 1 h in air. The material properties of the synthesized phosphors are investigated by X-ray diffraction (XRD), photoluminescence (PL) analyses, PL excitation spectroscopy, and luminescence lifetime measurements. At <jats:italic>x</jats:italic> = 0.015, the metastable phase of γ-Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> is obtained by calcination at <jats:italic>T</jats:italic> <jats:sub>c</jats:sub> ∼ 300–1050 °C and a mixture of γ, θ, and α phases at <jats:italic>T</jats:italic> <jats:sub>c</jats:sub> ∼ 1050–1150 °C. The high-temperature stable phase of α-Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> is obtained only at <jats:italic>T</jats:italic> <jats:sub>c</jats:sub> ≥ 1150 °C. Below <jats:italic>T</jats:italic> <jats:sub>c</jats:sub> ∼ 300 °C, the XRD data suggest the formation of boehmite (AlOOH). The solubility limit of Tb<jats:sup>3+</jats:sup> in α-Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> is also clearly determined to be <jats:italic>x</jats:italic> ∼ 0.015 (1.5%). The PL decay time of the Tb<jats:sup>3+</jats:sup> green emission in α-Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> is ∼1.1 ms for <jats:italic>x</jats:italic> < 0.015 and slowly decreases with further increase in <jats:italic>x</jats:italic> (Tb<jats:sup>3+</jats:sup>). The schematic energy-level diagram of Tb<jats:sup>3+</jats:sup> in α-Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> is proposed for a better understanding of the present phosphor system. Finally, the temperature dependence of the PL intensity is examined between <jats:italic>T</jats:italic> = 20 and 450 K, yielding quenching energies of <jats:italic>E</jats:italic> <jats:sub>q</jats:sub> ∼ 0.28 eV (α-Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and γ-Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>).</jats:p>

収録刊行物

被引用文献 (6)*注記

もっと見る

参考文献 (30)*注記

もっと見る

関連プロジェクト

もっと見る

キーワード

問題の指摘

ページトップへ