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.