An Artificial Light-Harvesting System with Controllable Efficiency Enabled by an Annulene-Based Anisotropic Fluid

Area of Science:

• Materials Science
• Organic Chemistry
• Physical Chemistry

Background:

• Developing controllable artificial light-harvesting systems is crucial but challenging.
• Liquid crystal (LC) materials offer unique anisotropic properties for such applications.

Purpose of the Study:

• To synthesize a novel annulene-based discotic liquid crystal (LC) compound for a tunable light-harvesting platform.
• To construct and investigate an artificial light-harvesting system using the synthesized LC as a donor and Nile red (NiR) as an acceptor.

Main Methods:

• Synthesis of a saddle-shaped cyclooctatetrathiophene core-based discotic LC compound.
• Formation of a light-harvesting system by loading Nile red (NiR) as an acceptor into the LC matrix.
• Investigation of the system's properties using temperature-dependent studies to leverage the LC's thermal-responsive self-assembling ability.

Main Results:

• The synthesized LC compound exhibits aggregation-induced emission, suitable for light-harvesting.
• The artificial light-harvesting system's efficiency is controllable by temperature due to the LC's variable molecular order.
• The system demonstrates high sensitivity at a donor/acceptor ratio of 1000:1 and a high antenna effect (39.1) at 100:1.

Conclusions:

• A thermochromic artificial light-harvesting LC system was successfully developed.
• The system's efficiency is tunable via temperature-induced changes in LC self-assembly.
• Potential applications in smart devices utilizing soft materials are indicated.