Quasi‐2D Chiral Perovskite Janus‐Structural Nanofiber Film With Tunable Spectrum and Energy‐Transfer‐Amplified Circularly Polarized Luminescence

Why It Matters

The breakthrough bridges the long‑standing trade‑off between chirality and emission efficiency, opening a pathway for high‑performance circularly polarized light sources in displays, sensors, and quantum‑optics markets.

Key Takeaways

• Energy transfer boosts achiral PL quantum yield fourfold.
• g_lum reaches 4.32 × 10⁻³, 50% higher than pristine.
• Janus nanofibers provide tunable, white‑light CPL emission.
• Design maintains environmental stability for practical devices.
• Strategy works with dyes and various achiral perovskites.

Pulse Analysis

Circularly polarized luminescence (CPL) has emerged as a cornerstone for next‑generation optoelectronics, yet chiral metal halide perovskites have struggled with low photoluminescence efficiency due to lattice distortions induced by chirality. Traditional approaches either sacrifice chiral intensity or sacrifice brightness, limiting commercial viability. By leveraging a quasi‑two‑dimensional chiral perovskite as an energy‑donor and pairing it with achiral perovskite nanocrystals or organic dyes, the new Janus‑structured nanofiber film sidesteps this dilemma, delivering both strong chirality and high emission output.

The core innovation lies in the engineered energy‑transfer interface within the Janus heterostructure. Efficient Förster‑type transfer channels funnel excitons from the chiral donor to the achiral acceptor, amplifying the latter’s photoluminescence quantum yield by a factor of four while simultaneously enhancing the overall CPL dissymmetry factor to 4.32 × 10⁻³. This synergy enables precise spectral tuning across the visible range, culminating in a stable white‑light CPL source—a rare achievement that merges color versatility with circular polarization.

From a market perspective, the platform’s robustness and scalability address key barriers for CPL‑based LEDs, secure communication, and stereoscopic imaging. The environmental stability reported suggests viable integration into consumer electronics without demanding exotic encapsulation. Moreover, the methodology is adaptable to a broad palette of achiral emitters, promising rapid extension into tailored photonic devices and fostering further research into chiroptoelectronic circuits. As industries chase higher data bandwidth and immersive visual experiences, this technology positions itself as a pivotal enabler.