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<p>Polymer nanocomposite films were fabricated by spin coating blends of the conjugated polymer poly(9,9-dioctylfluorene) (PFO) with CsPbCl<sub>3</sub> perovskite quantum dots (PQDs) over a concentration range of 1 to 15 wt%. Transmission electron microscopy (TEM) reveals uniform cubic CsPbCl₃ PQDs with a mean edge length of 8 ± 1.1&#xa0;nm, while X-ray diffraction (XRD) confirms the amorphous structure of all CsPbCl₃@PFO nanocomposites, characterized by dominant α-phase PFO conformation with minimal β-phase content. Photophysical characterization demonstrates that systematic doping with CsPbCl₃ PQDs significantly enhances three critical properties of PFO nanocomposites: efficient Förster resonance energy transfer (FRET), photoluminescence quantum yield (PLQY) improved from 46% (pure PFO) to 63% at the optimal 8 wt% doping level, and CIE 1976 violet-blue color tunability. Thermal stability of all films for operational OLED conditions was evaluated under ISOS-D-2 protocols by monitoring α-phase fluorescence decay at 70&#xa0;°C for 24&#xa0;h. The results demonstrated the potential of PQDs to stabilize CsPbCl₃@PFO nanocomposites under extreme operational conditions simulating KSA arid climates, enabling durable violet-blue OLEDs for medical phototherapy and sustainable, energy-efficient lighting technologies.</p> Graphical Abstract <p></p>

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Enhanced Photophysical and Optical Properties of CsPbCl₃@Poly(9,9-dioctylfluorene) Nanocomposite Films: A New Material for Violet-Blue OLED Phototherapy Applications

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Huda A. Alwusaydi,
  • Fatemah M. Barakat,
  • Samah El-Bashir,
  • Zeyad Almutairi

摘要

Polymer nanocomposite films were fabricated by spin coating blends of the conjugated polymer poly(9,9-dioctylfluorene) (PFO) with CsPbCl3 perovskite quantum dots (PQDs) over a concentration range of 1 to 15 wt%. Transmission electron microscopy (TEM) reveals uniform cubic CsPbCl₃ PQDs with a mean edge length of 8 ± 1.1 nm, while X-ray diffraction (XRD) confirms the amorphous structure of all CsPbCl₃@PFO nanocomposites, characterized by dominant α-phase PFO conformation with minimal β-phase content. Photophysical characterization demonstrates that systematic doping with CsPbCl₃ PQDs significantly enhances three critical properties of PFO nanocomposites: efficient Förster resonance energy transfer (FRET), photoluminescence quantum yield (PLQY) improved from 46% (pure PFO) to 63% at the optimal 8 wt% doping level, and CIE 1976 violet-blue color tunability. Thermal stability of all films for operational OLED conditions was evaluated under ISOS-D-2 protocols by monitoring α-phase fluorescence decay at 70 °C for 24 h. The results demonstrated the potential of PQDs to stabilize CsPbCl₃@PFO nanocomposites under extreme operational conditions simulating KSA arid climates, enabling durable violet-blue OLEDs for medical phototherapy and sustainable, energy-efficient lighting technologies.

Graphical Abstract