Magnetic-Responsive Near-Infrared Photothermal Conversion and Imaging in Organic Charge Transfer Cocrystals

• • Achieves 63.6% photothermal conversion efficiency at 1064 nm, exceeding many inorganic and polymeric photothermal agents, which reduces laser power requirements and mitigates thermal damage to surrounding tissue in clinical hyperthermia. • • Broad absorption from 300 to 1800 nm enables excitation across visible to NIR-II, facilitating deep-tissue penetration and compatibility with multiple laser sources, a critical advantage for photoacoustic imaging and seawater desalination. • • Magnetic field enhances photothermal conversion by increasing spin-parallel state ratio, yielding a measurable temperature rise; this dual functionality eliminates the need for composite magnetic nanoparticles, reducing process complexity and performance trade-offs. • • Structural stability over six months in air with negligible magnetization degradation and preserved photothermal response ensures long shelf-life and reliable operation in remote or resource-limited settings, addressing durability concerns of hybrid materials.