Highly‐Stable InP Quantum Dots With a Mesoporous ZIF‐8 and PMMA Double Layers and its Application in LCD Panels

ABSTRACT

InP quantum dots (QDs) are promising for next‐generation displays due to their superior color purity, high quantum yield, tunable emission, and non‐toxicity. However, their practical application is limited by instability under heat, oxygen, and intense illumination. To address this critical issue of stability, we proposed a dual‐layer encapsulation strategy. Firstly, InP/ZnSe/ZnS QDs are synthesized via a “one‐pot” approach. Then, mZIF‐8@QDs materials are prepared by embedding QDs into a mesoporous zeolite imidazolate framework (mZIF) formed after pore structure modification and surface modification. Finally, a novel vacuum‐assisted deposition method is employed to uniformly polymerize polymethyl methacrylate (PMMA) on the surface of mZIF‐8@QDs, thereby achieving a secondary coating and obtaining the mZIF‐8@QDs@PMMA composite material. The QDs loading capacity was significantly enhanced by modification of the saturated fatty acid for mesoZIF‐8. The synthesized fluorescent composite material exhibits high quantum yield, long fluorescence lifetime, good photostability and thermostability. Furthermore, this composite material is used as a color conversion layer in liquid crystal displays (LCDs). The experimental results indicate that the composite material has exceptional durability, and retains over 95% of its initial luminance after 1000 h of accelerated aging under continuous high‐temperature and high‐intensity blue light irradiation.