Work

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

Year: 2025

Type: article

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.

Source: Dyes and Pigments

DOI: 10.1016/j.dyepig.2025.112847

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

Institutions: Dalian University of Technology, State Key Laboratory of Fine Chemicals

Language: English

Topic: Liquid Crystal Research Advancements

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,590

Funders: Dalian University of Technology, Fundamental Research Funds for the Central Universities