Efficient FRET process between CsPbBr3 quantum dots and RhB dye molecules by pressure regulation

Fluorescence resonance energy transfer (FRET) based on quantum dots (QDs) and dye molecules have great application potential in biochemical fields. How to achieve an efficient energy transfer process has become an important research topic. Pressure can be used to regulate the energy transfer process, but its regulation on metal halide perovskite systems is rarely reported. Herein, the efficient FRET process between CsPbBr3 QDs and Rhodamine B (RhB) molecules under high pressure is investigated. Upon compression to 1.3 GPa, the FRET rate of the CsPbBr3–RhB composite reaches 0.21 ns−1 and the FRET efficiency is improved from 12.4% to 62.4%, due to enhanced spectral overlap and shortened minimum distance between CsPbBr3 QDs and RhB molecules. This study provides a strategy for achieving efficient FRET research and further promotes the development of applications based on halide perovskite molecular systems.