Ultra-low-voltage-driven efficient and stable perovskite light-emitting diodes

The poor operational stability of perovskite light-emitting diodes (PeLEDs) remains a major obstacle to their commercial application. Achieving high brightness and quantum efficiency at low driving voltages, thus effectively reducing heat accumulation, is key to enhancing the operational lifetime of PeLEDs. Herein, we present a breakthrough, attaining a record-low driving voltage while maintaining high brightness and efficiency. By thoroughly suppressing interface recombination and ensuring excellent charge transport, our PeLEDs, with an emission peak at 515 nanometers, achieve a maximum brightness of 90,295 cd m^-2 and a peak external quantum efficiency of 27.8% with an ultra-low turn-on voltage of 1.7 V (~70% bandgap voltage). Notably, Joule heat is nearly negligible at such low driving voltages, substantially extending the operational lifetime to 7,691.1 hours. Our optimized strategies effectively tackle stability issue through thermal management, paving the way for highly stable PeLEDs. 

https://www.science.org/doi/10.1126/sciadv.adp8473