Synergistic Effect of Cation Composition Engineering of Hybrid Cs1-xFAxPbBr3 Nanocrystals for Self-Healing Electronics Application

Mixed-cation hybrid perovskite nanocrystal (HPNC) with high crystallinity, color purity, and tunable optical bandgap offers a practical pathway toward next-generation displays. Herein, a two-step modified hot-injection combined with cation compositional engineering and surface treatment to synthesize high-purity cesium/formamidinium lead bromide HPNCs(Cs(1-x)FA(x)PbBr(3)) is presented. The optimized Cs(0.5)FA(0.5)PbBr(3) light-emitting devices (LEDs) exhibit uniform luminescence of 3500 cd m(-2) and a prominent current efficiency of 21.5 cd A(-1). As a proof of concept, a self-healing polymer (SHP) integrated with white LED backlight and laser prototypes exhibited 4 h autonomous self-healing through the synergistic effect of weak reversible imine bonds and stronger H-bonds. First, the SHP-HPNCs-initial and SHP-HPNCs-cut possess high long-term stability and dramatically suppressed lead leakage as low as 0.6 ppm along with a low leakage rate of 1.11 x 10(-5) cm(2) and 3.36 x 10(-5) cm(2) even over 6 months in water. Second, the Cs(0.5)FA(0.5)PbBr(3) HPNCs and SHP-induced shattered-repaired perovskite glass substrate show the lowest lasing threshold values of 1.24 and 8.58 mu J cm(-2), respectively. This work provides an integrative and in-depth approach to exploiting SHP with intrinsic and entropic self-healing capabilities combined with HPNCs to develop robust and reliable soft-electronic backlight and laser applications.

Automated summary

Hybrid perovskite nanocrystals with high crystallinity, color purity, and tunable optical bandgap have been successfully synthesized via a modified hot-injection method combined with cation compositional engineering and surface treatment. The optimized nanocrystals exhibit uniform luminescence and high current efficiency, showing great potential for next-generation displays. Furthermore, the integration of self-healing polymer with the nanocrystals enables the development of robust and reliable soft-electronic backlight and laser applications.