Visible-light emission properties of α-TeO₂:Houp>3+up>/Ybup>3+up>/Euup>3+up> nanoparticles via both up- and down-conversion modes

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• 作者：Yao ZHANG (张 遥) ; Guokang FAN (范国康) ; Hui HU (胡 辉) ; Weilong CHEN (陈伟龙) ; Yan BAI (白 燕)up> ; up>up>tbaiyan@jnu.edu.cn" class="auth_mail" title="E-mail the corresponding authorup>
• 关键词：up-conversion ; down-conversion ; luminescence ; α-TeO2 nanoparticles ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：34
• 期：11
• 页码：1069-1076
• 全文大小：3804 K

文摘

In this study, α-TeO₂:Houp>3+up>/Ybup>3+up>, α-TeO₂:Euup>3+up> and α-TeO₂:Houp>3+up>/Ybup>3+up>/Euup>3+up> nanoparticles were prepared via a simple hydrothermal process. The up- and down-conversion properties of the as-prepared nanoparticles were tested at room temperature under a near-infrared photo source (980 nm) and UV-vis photo source, respectively. The results indicated that α-TeO₂ NPs were a kind of outstanding host material for both up- and down-conversion luminescence. The α-TeO₂:Houp>3+up>/Ybup>3+up> nanoparticles showed sharp up-conversion emission at 545 and 660 nm under 980 nm excitation, ascribed to the up>5up>S₂→up>5up>I₈ and up>5up>F₅→up>5up>I₈ (Houp>3+up>) transitions, and weaker down-conversion emission at 545 nm under 455 nm excitation, ascribed to the up>5up>S₂→up>5up>I₈ (Houp>3+up>) transitions. The α-TeO₂:Euup>3+up> nanoparticles showed strong down-conversion emission at 592 and 615 nm under 395 nm excitation, attributed to the up>5up>D₀→up>7up>F₁ and up>5up>D₀→up>7up>F₂ (Euup>3+up>) transitions. Possessing the advantages of these two luminescent materials, the as-prepared tri-doped samples of α-TeO₂:0.5Houp>3+up>/10Ybup>3+up>/3Euup>3+up> (mol.%) nanoparticles could successfully emit visible light via both up- and down-conversion modes.