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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Color-tunable and enhanced luminescence of well-defined sodium scandium fluoride nanocrystals
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Color-tunable and enhanced luminescence of well-defined sodium scandium fluoride nanocrystals

机译：明确定义的氟化scan钠纳米晶体的颜色可调和增强的发光

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In this paper, well-defined and regular-shaped Na_3ScF _6 nanocrystals (NCs) have been synthesized in high boiling organic solvents 1-octadecene (ODE) and oleic acid (OA), via the thermal decomposition of rare-earth oleate precursors. It is found that highly uniform monoclinic Na_3ScF_6 NCs with narrow size distribution have been obtained, which can easily be dispersed in cyclohexane solvent to form transparent colloid solutions. Upon 980 laser diode (LD) excitation, the relative up-conversion (UC) emission intensities of different colors in Yb ~(3+)/Er~(3+), Yb~(3+)/Tm~(3+) and Yb ~(3+)/Ho~(3+) doped Na_3ScF_6 can be tuned by altering the Yb~(3+) doping concentration, resulting in the tunable multicolor in a wide range. On the basis of the emission spectra and the plot of luminescence intensity to pump power, the UC mechanisms of the co-doped Na _3ScF_6 NCs were investigated in detail. Moreover, the UC emission intensities can be significantly improved by coating a layer of Na _3ScF_6:Yb~(3+)/Ln~(3+) shell on Na _3ScF_6:Yb~(3+)/Ln~(3+) cores with respect to that of pure Na_3ScF_6:Yb~(3+)/Ln~(3+) core NCs. Furthermore, transparent and UC luminescent NCs/polydimethylsiloxane (PDMS) composites with regular dimensions were also fabricated by an in situ polymerization route. Uniform NCs with a wide variation of luminescence colors will show potential applications in diverse fields.
机译：本文通过稀土油酸盐前驱物的热分解，在高沸点有机溶剂1-十八碳烯（ODE）和油酸（OA）中合成了定义明确且规则形状的Na_3ScF _6纳米晶体。发现已经获得了具有窄尺寸分布的高度均匀的单斜Na_3ScF_6 NC，其可以容易地分散在环己烷溶剂中以形成透明的胶体溶液。在980激光二极管（LD）激发后，Yb〜（3 +）/ Er〜（3 +），Yb〜（3 +）/ Tm〜（3+）中不同颜色的相对上转换（UC）发射强度Yb〜（3 +）/ Ho〜（3+）掺杂的Na_3ScF_6可以通过改变Yb〜（3+）的掺杂浓度来调节，从而产生宽范围的可调多色。根据发射光谱和发光强度与泵浦功率的关系图，详细研究了共掺杂的Na _3ScF_6 NCs的UC机理。此外，通过在Na _3ScF_6：Yb〜（3 +）/ Ln〜（3+）核上覆盖一层Na _3ScF_6：Yb〜（3 +）/ Ln〜（3+）壳层，可以显着提高UC发射强度。相对于纯Na_3ScF_6：Yb〜（3 +）/ Ln〜（3+）核心NC。此外，还通过原位聚合路线制备了具有规则尺寸的透明和UC发光NCs /聚二甲基硅氧烷（PDMS）复合材料。具有各种发光颜色的统一NC将在各种领域中显示出潜在的应用。

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