Stabilization of perovskite nanocrystals for displays

Abstract

Metal halide perovskites are promising color-conversion materials for next-generation displays but remain limited by the trade-off between efficiency and operational stability. We introduce a hierarchical-shell (HS) architecture that establishes lattice–interface interlocking through interbonded PbSO₄–SiO₂–siloxane layers, simultaneously stabilizing the soft ionic lattice and reactive surface. In situ GIWAXS confirms suppression of photo- and thermo-induced lattice expansion, mitigating ion migration and interfacial degradation. This design enables near-unity photoluminescence quantum yield in solid films (100% for green HS-MAPbBr₃) and transforms self-absorption into efficient photon recycling, yielding a record 91.4% external quantum yield in color-conversion films. In parallel, Pb-terminated surface engineering in red mixed-halide perovskites significantly enhances high-intensity photostability. These strategies provide a unified pathway toward efficient and durable perovskite display systems.