Expanding the synthetic toolbox to access pristine and rare-earth-doped BaFBr nanocrystals
Expanding the synthetic toolbox to access pristine and rare-earth-doped BaFBr nanocrystals
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DOI：
10.1039/d1dt02694a
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发表时间：
2021-10-12
影响因子：
4
通讯作者：
Rabuffetti, Federico A.
中科院分区：
文献类型：
--
作者：
Dhanapala, B. Dulani;Munasinghe, Hashini N.;Rabuffetti, Federico A.
一种新的合成路线，以获得原始的和稀土掺杂的BaFBr纳米晶体。该路线的核心是用作双卤素源的式Ba-5（CF2 BrCOO）（10）（H2O）（7）的有机-无机混合前体。将该前体在高沸点有机溶剂的混合物中加热，得到球形BaFBr纳米晶体（直径约为26 nm）。Yb：Er：BaFBr纳米立方体（长度约为20 nm）按照相同的路线获得。稀土掺杂纳米晶体在980 nm激发下表现出近红外到可见光的光子上转换。Er 3+的绿色发射的温度依赖性可用于150和450 K之间的光学温度传感，在300 K下实现11 × 10（-2）K-1的灵敏度和300.9 +/- 1.5 K的平均计算温度。本文提出的合成路线不仅能够获得未开发的上转换材料，而且更重要的是，创造了开发基于BaFBr的可溶液加工的光激励磷光体的机会。
A new synthetic route to access pristine and rare-earth-doped BaFBr nanocrystals is described. Central to this route is an organic-inorganic hybrid precursor of formula Ba-5(CF2BrCOO)(10)(H2O)(7) that serves as a dual-halogen source. Thermolysis of this precursor in a mixture of high-boiling point organic solvents yields spherical BaFBr nanocrystals (approximate to 26 nm in diameter). Yb:Er:BaFBr nanocuboids (approximate to 20 nm in length) are obtained following the same route. Rare-earth-doped nanocrystals display NIR-to-visible photon upconversion under 980 nm excitation. The temperature-dependence of the green emission from Er3+ may be exploited for optical temperature sensing between 150 and 450 K, achieving a sensitivity of 11 x 10(-2) K-1 and a mean calculated temperature of 300.9 +/- 1.5 K at 300 K. The synthetic route presented herein not only enables access to unexplored upconverting materials but also, and more importantly, creates the opportunity to develop solution-processable photostimulable phosphors based on BaFBr.