使用限制在 BNNT 内部的高度偏振发光染料的荧光各向异性,Materials Horizons

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使用限制在 BNNT 内部的高度偏振发光染料的荧光各向异性
Materials Horizons ( IF 12.2 ) Pub Date : 2022-12-20 , DOI: 10.1039/d2mh01239a
A Badon ₁ , J-B Marceau ₁ , C Allard ₂ , F Fossard ₃ , A Loiseau ₃ , L Cognet ₁ , E Flahaut ₄ , G Recher ₁ , N Izard ₅ , R Martel ₆ , E Gaufrès ₁

Affiliation

纳米级发射器的偏振荧光发射已被广泛研究用于生物成像、显示器和光通信等应用。然而，在大型紧凑型发射器组件中扩展极化特性具有挑战性，因为自聚集过程会引起分子偶极子的去极化效应、猝灭和抵消。在这里，我们使用限制在氮化硼纳米管 (6T@BNNTs) 内的 α-六噻吩 (6T) 分子在透明主体中诱导荧光各向异性。实验首先表明，单个 6T@BNNT 在室温下表现出高达 700 的高偏振消光比。使用像差校正的 HRTEM，我们表明荧光各向异性与封装的 6T 分子沿纳米管轴的一般排列一致。分子排列受纳米管直径的影响很小，这种现象归因于与分子间相互作用相比更强的分子与侧壁相互作用。通过拉伸由与 6T@BNNT 混合的透明聚合物制成的柔性薄膜，我们在薄膜内诱导了宏观荧光各向异性。这项工作表明，dyes@BNNT 系统可以用作易于操作的平台来诱导光子材料中的荧光各向异性。

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Fluorescence anisotropy using highly polarized emitting dyes confined inside BNNTs

Polarized fluorescence emission of nanoscale emitters has been extensively studied for applications such as bioimaging, displays, and optical communication. Extending the polarization properties in large assemblies of compact emitters is, however, challenging because of self-aggregation processes, which can induce depolarization effects, quenching, and cancellations of molecular dipoles. Here we use α-sexithiophene (6T) molecules confined inside boron nitride nanotubes (6T@BNNTs) to induce fluorescence anisotropy in a transparent host. The experiments first indicate that individual 6T@BNNTs exhibit a high polarization extinction ratio, up to 700, at room temperature. Using aberration-corrected HRTEM, we show that the fluorescence anisotropy is consistent with a general alignment of encapsulated 6T molecules along the nanotube axis. The molecular alignment is weakly influenced by the nanotube diameter, a phenomenon ascribed to stronger molecule-to-sidewall interactions compared to intermolecular interactions. By stretching a flexible thin film made of transparent polymers mixed with 6T@BNNTs, we induce a macroscopic fluorescence anisotropy within the film. This work demonstrates that the dyes@BNNT system can be used as an easy-to-handle platform to induce fluorescence anisotropy in photonic materials.

更新日期：2022-12-20

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