Dual-Mode Circularly Polarized Light Emission and Metal-Enhanced Fluorescence Realized by the Luminophore–Chiral Cellulose Nanocrystal Interfaces,ACS Applied Materials & Interfaces

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Dual-Mode Circularly Polarized Light Emission and Metal-Enhanced Fluorescence Realized by the Luminophore–Chiral Cellulose Nanocrystal Interfaces
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-12-01 , DOI: 10.1021/acsami.1c19404
Sixiang Zhao ₁ , Yingying Yu ₁ , Boyu Zhang ₁ , Pu Feng ₁ , Congcong Dang ₁ , Ming Li ₁ , Liancheng Zhao ₁ , Liming Gao ₁

Affiliation

Circularly polarized (CP) light has attracted wide attention for its great potential in broad applications. However, it remains a challenge to generate left-handed and right-handed circularly polarized (LCP and RCP) light from cellulose nanocrystal (CNC)-based materials only with an intrinsic left-handed chiral structure, owing to the pattern of CP light emission primarily based on the chirality of materials. Herein, a separation structure of luminophore layers and chiral CNCs was provided to achieve dual-mode CP light emission by building a luminophore–chiral CNC interface. By directly exciting the back and front of two-layer films, LCP and RCP light could be easily emitted without any assisting means and specific setting angles. In addition, owing to the formation of the luminophore–chiral CNC interface, metal-enhanced fluorescence (MEF) was achieved to offset the brightness loss caused by circular polarization. By incorporating gold triangular nanoprisms in CNC chiral layers, the fluorescence enhancement of the ensemble was as high as 6.5-fold. The decisive role of the luminophore–chiral CNC interface in enhancing luminescence and dual-mode CP light emission was carefully investigated by contrasting the systems with and without luminophore–chiral CNC interfaces in this study. We believe that this dual-mode CP light emission film with MEF enables a promising approach to extending the application of CP light materials.

中文翻译：

由发光体-手性纤维素纳米晶体界面实现的双模圆偏振光发射和金属增强荧光

圆偏振（CP）光因其在广泛应用中的巨大潜力而受到广泛关注。然而，由于 CP 发光的模式，仅具有内在左手手性结构的基于纤维素纳米晶体 (CNC) 的材料产生左手和右手圆偏振（LCP 和 RCP）光仍然是一个挑战主要基于材料的手性。在此，提供了发光体层和手性 CNC 的分离结构，通过构建发光体 - 手性 CNC 界面来实现双模式 CP 发光。通过直接激发两层薄膜的背面和正面，可以轻松发射LCP和RCP光，无需任何辅助手段和特定的设置角度。此外，由于发光体-手性 CNC 界面的形成，实现了金属增强荧光（MEF）以抵消由圆偏振引起的亮度损失。通过在 CNC 手性层中加入金三角纳米棱镜，该集合的荧光增强高达 6.5 倍。在本研究中，通过对比具有和不具有发光体 - 手性 CNC 界面的系统，仔细研究了发光体 - 手性 CNC 界面在增强发光和双模 CP 发光方面的决定性作用。我们相信，这种具有 MEF 的双模 CP 发光膜能够为扩展 CP 光材料的应用提供一种有前景的方法。在本研究中，通过对比具有和不具有发光体 - 手性 CNC 界面的系统，仔细研究了发光体 - 手性 CNC 界面在增强发光和双模 CP 发光方面的决定性作用。我们相信，这种具有 MEF 的双模 CP 发光膜能够为扩展 CP 光材料的应用提供一种有前景的方法。在本研究中，通过对比具有和不具有发光体 - 手性 CNC 界面的系统，仔细研究了发光体 - 手性 CNC 界面在增强发光和双模 CP 发光方面的决定性作用。我们相信，这种具有 MEF 的双模 CP 发光膜能够为扩展 CP 光材料的应用提供一种有前景的方法。

更新日期：2021-12-15

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