FRET-driven hybrid polymer-perovskite matrices for efficient pure-red emission.

Achieving efficient pure-red emission in perovskite-based high-definition display applications remains challenging due to persistent spectral, thermodynamic, and operational instability. Although significant progress has been made using red-emitting quasi-2D perovskites, quantum dots, and mixed-halide perovskites, their performance under operational conditions often remains limited. Here, we address these challenges by embedding mixed-halide perovskite nanocrystals (PeNCs) into a polymer matrix to create a donor-acceptor architecture. This hybrid system stabilizes the nanocrystals and enables efficient energy transfer Förster resonance energy transfer (FRET). We observe enhanced acceptor photoluminescence and reduced donor lifetimes, confirming the effective FRET-mediated energy transfer arising from optimal spectral overlap. With a FRET rate of 0.18 ps and a FRET efficiency of 88.9%, our approach provides spectrally stable, enhanced pure-red emission. Moreover, it demonstrates a pathway for designing customized energy cascades, paving the way for next-generation optoelectronic devices with improved stability and performance.