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<p>Efficient triplet-triplet annihilation upconversion (TTA-UC) in chiral liquid crystal composites provides a promising platform for applications that require simultaneous energy conversion and control over luminescence polarization. However, the upconversion efficiency (<i>Φ</i><sub>UC</sub>) in such systems is often severely limited by restricted exciton diffusion and back energy transfer processes. Here, a synergistic strategy is demonstrated to simultaneously enhance <i>Φ</i><sub>UC</sub> and enable programmable polarized emissions by integrating a singlet energy sink into chiral photonic superstructures featuring dual photonic bandgaps (DPBGs). These superstructures are constructed via a facile co-assembly process followed by ultraviolet-induced photopolymerization. Precise control over the polymerization degree generates two distinct and independently tunable photonic bandgaps spanning the visible to near-infrared regions. Strategic alignment of the DPBGs with both upconversion and downshifting emission bands yields a 3.7-fold enhancement in <i>Φ</i><sub>UC</sub> and a luminescence dissymmetry factor of up to 0.8. Notably, CPL-aware pattern recognition is achieved, in which a compact convolutional neural network extracts encoded glyphs from polarization contrast in thermoresponsive chiroptical matrices. This work advances the design of high-performance TTA-UC materials and establishes a versatile framework for chiral photonics, optical information processing, and next-generation photovoltaic technologies.</p>

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Programmable dual photonic bandgaps boost photon upconversion and polarized emission for CPL-aware information reading

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Honghan Ji,
  • Ji-Kun Li,
  • Zhi-Wang Luo,
  • Jieyu Tang,
  • Fang Zeng,
  • Yongzhi Zhou,
  • Bowen Yang,
  • Ruiwen Wang,
  • Xue Jin,
  • Dong Liu,
  • Xiao-Ye Wang,
  • Pengfei Duan

摘要

Efficient triplet-triplet annihilation upconversion (TTA-UC) in chiral liquid crystal composites provides a promising platform for applications that require simultaneous energy conversion and control over luminescence polarization. However, the upconversion efficiency (ΦUC) in such systems is often severely limited by restricted exciton diffusion and back energy transfer processes. Here, a synergistic strategy is demonstrated to simultaneously enhance ΦUC and enable programmable polarized emissions by integrating a singlet energy sink into chiral photonic superstructures featuring dual photonic bandgaps (DPBGs). These superstructures are constructed via a facile co-assembly process followed by ultraviolet-induced photopolymerization. Precise control over the polymerization degree generates two distinct and independently tunable photonic bandgaps spanning the visible to near-infrared regions. Strategic alignment of the DPBGs with both upconversion and downshifting emission bands yields a 3.7-fold enhancement in ΦUC and a luminescence dissymmetry factor of up to 0.8. Notably, CPL-aware pattern recognition is achieved, in which a compact convolutional neural network extracts encoded glyphs from polarization contrast in thermoresponsive chiroptical matrices. This work advances the design of high-performance TTA-UC materials and establishes a versatile framework for chiral photonics, optical information processing, and next-generation photovoltaic technologies.