The lack of stability of red perovskite
nanocrystals (PeNCs) remains
the main problem that restricts their patterning application. In this
work, the dual-ligand passivation strategy was introduced to stabilize
PeNCs and inhibit their halogen ion migration during high-voltage
electrohydrodynamic (EHD) inkjet printing. The as-printed red arrays
exhibit the highest emisson intensity and least blue shift compared
with samples with other passivation strategies under a high electric
field during EHD inkjet printing. Combining with blue and green PeNC
inks, single-color and tricolor color conversion layer arrays were
successfully printed, with minimum pixel size of 5 μm and the
highest spatial resolution of 2540 dpi. The color coordinate of CsPbBrI2 NCs arrays are located close to the red point, with a color
gumat of 97.28% of Rec. 2020 standard. All of these show great potential
in the application of color conversion layers in a near-eye micro-LED
display.