Enhanced Long‐Term Luminescent Stability through Near‐Single‐Dot Passivation and Encapsulation of Perovskite Quantum Dots for Printable Photonics

Metal halide perovskites quantum dots (QDs) stand at the forefront of multifarious photonic applications, including micro-light-emitting diode and further augmented reality, virtual other novel display, lighting technologies. Barriers to however, lie in their toxicity lead, instability light, moisture heat, processability nanoscale-particle level. Herein, a simple versatile postprocessing approach is reported for near-single-dot passivation encapsulation representative lead-free double perovskite Cs2Ag0.4Na0.6InCl6:Bi through liquid-phase processing perhydropolysilazane colloid with controllable hydrolysis curing. The conventional unstable oleylamine oleic acid ligands are replaced by -NCl bonding on surface nanocrystal, accompanied resulting compact robust silica layer without compromising optical properties dots. With protection, do not show fluorescence quenching even when stored more than 90 days exhibit remarkably improved stability against ultraviolet irradiation humidity compared raw strategy offers way creating level protection luminescent dots, can be universally compatible solution-based patterning techniques photonics applications where used.