Synergistic Effect of Cation Composition Engineering of Hybrid Cs1−xFAxPbBr3 Nanocrystals for Self-healing Electronics Application
Fang-Cheng Liang, Fu-Cheng Jhuang, Yu-Han Fang, Jean-Sebastien Benas, Wei-Cheng Chen, Zhen-Li Yan, Wei-Chun Lin, Chun-Jen Su, Yuki Sato, Takayuki Chiba*, Junji Kido*, and Chi-Ching Kuo*
2023/05/25
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(Cs1-xFAxPbBr3) is presented. The optimized Cs0.5FA0.5PbBr3 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 × 10−5 cm2 and 3.36 × 10−5 cm2 even over 6 months in water. Second, the Cs0.5FA0.5PbBr3 HPNCs and SHP-induced shattered–repaired perovskite glass substrate show the lowest lasing threshold values of 1.24 and 8.58 µJ 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.
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