Pyrrolopyrrole cyanine dye doping liquid crystals with thermal sensing and polarized near-infrared luminescent properties

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED Dyes and Pigments Pub Date : 2025-09-01 Epub Date: 2025-04-21 DOI:10.1016/j.dyepig.2025.112847

Wen Shi, Yingnan Xu, Huaxin Zhu, Wenqiang Qiao, Zhi Yuan Wang

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Abstract

Near-infrared (NIR) luminescent liquid crystals (LLCs) have garnered great academic interest because of their potential applications in liquid-crystal displays, thermal sensing, and smart devices. However, the development of NIR LLCs is currently limited by the scarcity of NIR dyes with adequate compatibility with liquid crystals and high luminous efficiency. Pyrrolopyrrole cyanine (PPCy) is a class of dye with good photostability and high fluorescence quantum yield in the NIR spectral region, but has not used for LLCs. In this study, we designed and synthesized two novel PPCy compounds with high solubility and luminous efficiency, namely PDPB and PDPBF, and prepared efficient and stable NIR LLCs by incorporating PDPBF into commercially available liquid crystals (8OCB and E7). The LC mixture PDPBF-8OCB shows both high quantum yield (QY) of 49.8 % and high dichroic ratio (N) of 4.11 by rubbing alignment in its nematic LC phase. This study presents a feasible method for obtaining stable NIR LLCs, addressing the challenges of efficiency, stability and compatibility of NIR LLCs.

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具有热敏和偏振近红外发光性能的吡咯咯菁染料掺杂液晶

近红外（NIR）发光液晶（LLC）因其在液晶显示、热感应和智能设备中的潜在应用而引起了学术界的极大兴趣。然而，由于缺乏与液晶充分兼容且发光效率高的近红外染料，近红外发光液晶（LLC）的开发目前受到了限制。吡咯啉青（PPCy）是一类在近红外光谱区具有良好光稳定性和高荧光量子产率的染料，但尚未用于 LLC。在本研究中，我们设计并合成了两种具有高溶解性和发光效率的新型 PPCy 化合物，即 PDPB 和 PDPBF，并通过将 PDPBF 加入市售液晶（8OCB 和 E7）中制备了高效稳定的近红外 LLC。PDPBF-8OCB 的液晶混合物通过在其向列液晶相中进行摩擦排列，显示出 49.8 % 的高量子产率 (QY) 和 4.11 的高二色性比 (N)。这项研究提出了一种获得稳定近红外有限责任公司的可行方法，解决了近红外有限责任公司在效率、稳定性和兼容性方面的难题。

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.