Spatial control of upconversion emission in a single fluoride microcrystal via the excitation mode and native interference effect†,Journal of Materials Chemistry C

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Spatial control of upconversion emission in a single fluoride microcrystal via the excitation mode and native interference effect†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-12-18 00:00:00 , DOI: 10.1039/c7tc05032a
Dangli Gao _{1,

2,

3,

4,

5} , Dan Wang _{1,

2,

3,

4} , Xiangyu Zhang _{1,

4,

6,

7} , Xiaojuan Feng _{1,

2,

3,

4} , Hong Xin _{1,

2,

3,

4} , Sining Yun _{2,

3,

4,

8} , Dongping Tian _{1,

2,

3,

4}

Affiliation

Lanthanide (Ln)-doped upconversion (UC) micro/nanomaterials have attracted significant attention in various applications. However, spatial control of UC emission from micro/nanomaterials has not been developed to date due to the ineffective quantum yield and weak luminescence intensity. In this study, the fascinating luminescent patterns, including a dual-colour dumbbell, sunflower, rod-shaped candy, dichroic plate, and coloured ring from a series of single NaYF₄:Yb/Ln (Ln = Er, Ho, and Tm) microcrystals, that exhibit different distinctive distributions on luminescence intensity and colour in space are obtained by varying the excitation modes. The overall integral UC intensity of a single microtube by waveguiding-excitation is invariably stronger relative to that in the case of the spot-excitation approach, and the enhancement factor increases 10 times. We explained the underlying physical mechanisms behind the changes in the colour and intensity of the luminescent pattern based on the native diffraction and interference effect of microcrystals. These findings provide a new way to improve UC luminescence and facilitate a basic understanding of the use of UC micro/nanocrystals as natural interference devices, which will result in new applications in displays, optical waveguides, and anti-counterfeiting.

中文翻译：

通过激发模式和固有干扰效应对单个氟化物微晶中上转换发射的空间控制†

掺杂镧系元素（Ln）的上转换（UC）微/纳米材料在各种应用中引起了极大的关注。然而，由于无效的量子产率和弱的发光强度，迄今为止尚未开发出对微米/纳米材料的UC发射进行空间控制的方法。在这项研究中，令人着迷的发光图案包括双色哑铃，向日葵，棒状糖果，二向色板和来自一系列单个NaYF _4的有色环通过改变激发模式，可以获得在发光强度和空间颜色上表现出不同的独特分布的：Yb / Ln（Ln = Er，Ho和Tm）微晶。相对于点激励方法，通过波导激励的单个微管的整体积分UC强度始终恒定，并且增强因子增加10倍。我们基于微晶的自然衍射和干涉效应，解释了发光图案的颜色和强度变化背后的潜在物理机制。这些发现为改善UC发光并促进对UC微/纳米晶体用作自然干涉器件的基本理解提供了新的途径，这将导致显示器，光波导和防伪的新应用。

更新日期：2017-12-18

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