Zwitterionic Carbazole Ligands Enhance the Stability and Performance of Perovskite Nanocrystals in Light-Emitting Diodes

We introduce a new carbazole-based zwitterionic ligand(DCzGPC)synthesized via Yamaguchi esterification which enhances the efficiencyof lead halide perovskite (LHP) nanocrystals (NCs) in light-emittingdiodes (LED). A facile ligand exchange of the native ligand shell,monitored by nuclear magnetic resonance (NMR), ultraviolet-visible(UV-vis), and photoluminescence (PL) spectroscopy, enablesmore stable and efficient LHP NCs. The improved stability is demonstratedin solution and solid-state LEDs, where the NCs exhibit prolongedluminescence lifetimes and improved luminance, respectively. Theseresults represent a promising strategy to enhance the stability ofLHP NCs and to tune their optoelectronic properties for further applicationin LEDs or solar cells.

Automated summary

We synthesized a new carbazole-based zwitterionic ligand (DCzGPC) via Yamaguchi esterification, which improves the efficiency of lead halide perovskite (LHP) nanocrystals (NCs) in light-emitting diodes (LEDs). Through ligand exchange, monitored by nuclear magnetic resonance (NMR), ultraviolet-visible (UV-vis), and photoluminescence (PL) spectroscopy, the LHP NCs become more stable and efficient. The stability improvement is demonstrated in solution and solid-state LEDs where the NCs show prolonged luminescence lifetimes and improved luminance. These findings provide a promising strategy for enhancing the stability of LHP NCs and tuning their optoelectronic properties for further applications in LEDs or solar cells.