Visible-light emission properties of α-TeO₂:Ho³⁺/Yb³⁺/Eu³⁺ nanoparticles via both up-and down-conversion modes

来源期刊：Journal of Rare Earths2016年第11期

论文作者：张遥 范国康 胡辉 陈伟龙 白燕

文章页码：1069 - 1076

摘    要：In this study,α-TeO₂:Ho³⁺/Yb³⁺,α-TeO₂:Eu³⁺ and α-TeO₂:Ho³⁺/Yb³⁺/Eu³⁺ 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:Ho³⁺/Yb³⁺ nanoparticles showed sharp up-conversion emission at 545 and 660 nm under 980 nm excitation,ascribed to the ⁵S₂→⁵I₈ and ⁵F₅→⁵I₈(Ho³⁺) transitions,and weaker down-conversion emission at 545 nm under 455 nm excitation,ascribed to the ⁵S₂→⁵I₈(Ro³⁺) transitions.The α-TeO₂:Eu³⁺nanoparticles showed strong down-conversion emission at 592 and 615 nm under 395 nm excitation,attributed to the ⁵D₀→⁷F₁ and⁵D₀→⁷F₂(Eu³⁺) transitions.Possessing the advantages of these two luminescent materials,the as-prepared tri-doped samples ofα-TeO₂:0.5Ho³⁺/10Yb³⁺/3Eu³⁺（mol.%） nanoparticles could successfully emit visible light via both up- and down-conversion modes.