Harnessing\nVibrationally Assisted Delayed Fluorescence\nfor Enhanced Energy Transfer in Mn-Doped CsPbBr<sub>3</sub> Nanocrystals

This\nstudy explores vibrationally assisted delayed fluorescence\n(VADF) in Mn-doped CsPbBr<sub>3</sub> nanocrystals using Förster\nresonance energy transfer (FRET). Mn doping enhances the FRET efficiency\nsignificantly due to an increase in host fluorescence efficiency,\nindicating an increase in the radiative pathways due to VADF. We observed\nthat Mn facilitates efficient back-transfer of charge carriers, improving\nenergy transfer to acceptor molecules such as Rhodamine 6G (R6G).\nThe simplicity of tuning optical properties through Mn doping presents\na promising method to enhance the energy efficiency in donor–acceptor\nsystems for optoelectronic applications. However, further research\non halide concentrations, acceptor molecules, and electron transfer\nmechanisms is necessary to optimize these systems for effective light\nenergy harvesting.