Polarized Emission Perovskite Nanorod Enhancement Film for Advanced LCD Devices

Liquid crystal displays (LCDs) suffer from inherent efficiency losses due to the absorption of unpolarized backlight by the front polarizer, with approximately 50%–60% of light wasted. To address this polarization bottleneck, we present a scalable and non-contact strategy to fabricate macroscopically aligned perovskite nanorod enhancement films (NREFs) that emit intrinsically polarized light, enabling direct integration as color conversion layers in LCDs. The core challenge of incompatibility between CsPbBr₃ perovskite nanorods (PNRs) and liquid crystal monomers (LCMs) was resolved via a ligand design and exchange. Utilizing an SD1 sulfonic bisazodye photoalignment layer, we achieved high-fidelity, lithographically defined alignment of the PNR/LCM composite, permanently locked by in situ photopolymerization. The resulting freestanding films exhibit a degree of polarization (DOP) of 0.5, representing one of the highest values reported for solution-processed PNR composites without mechanical or field-based treatment. Furthermore, we demonstrate spatially patterned polarized emission with a domain boundary resolution of ~20 μm via sequential masked exposures, meeting the pixel pitch requirements for modern high-resolution displays. This work establishes a practical route toward pixelated, polarization-resolved quantum-dot color converters, directly addressing the dual challenges of efficiency and color gamut in next-generation LCD architectures.