Improving stabilities of perovskite nanocrystals toward the application of Micro-LED

Micro light-emitting diodes (μ-LEDs) coupled with color conversion phosphors are among the most promising technologies for future display and artificial light sources. Here, we demonstrate down-converting μ-LED phosphors based on CsPbBr3 perovskite nanocrystals grown directly within perfectly sealed mesoporous silica nanospheres (NSs). Through a selective sintering technology, we can synthesize CsPbBr3/SiO2 NSs with emission efficiency >87% at high temperatures (>500oC) without causing interparticle cross-linking or aggregation. The resulting CsPbBr3-SiO2 NSs with uniform size, good solution dispersion, ultra-stable, and high brightness meet the technical requirements of photolithographic inks and can achieve highly uniform μ-LED color conversion patterns with pixels smaller than 20 μm.