Superhydrophobic Luminescent Pixel Array Based on Perovskite Quantum Dots for Outdoor Displays

Perovskite quantum dots (PQDs) have garnered significant attention in the display industry as high-performance luminescent materials in recent years. However, in outdoor applications, it is highly challenging to maintain the luminescent performance of PQDs while simultaneously ensuring superhydrophobicity and self-cleaning functionality in rainy weather conditions. Here, we report a luminescent pixel array fabricated using superhydrophobic PQDs with a photoluminescence quantum yield (PLQY) of 32%. The surface exhibits a high static contact angle of 168° and a rolling angle of <1°, demonstrating excellent self-cleaning ability. Specifically, by loading encapsulated PQDs onto fluorinated silica particles of varying particle sizes, a multilevel micronano hierarchical raspberry-like interface is formed. Simultaneously, local evaporation quenching induced by pulsed laser irradiation is employed to create a photoluminescent array with individual pixel diameters of 300 μm and a spacing of 80 μm. This achievement fills the gap in the application of PQDs for outdoor displays.