The Roles of the Halide Elements and the Drive Mode for the Stability of Blue Perovskite Light-Emitting Diodes

Perovskite light-emitting diodes (PeLED) owns the great potential for the further commercial application, while deep blue emitting and stability issue of PeLED should get more attention. In this paper, we investigated the simple strategy to tailor the color by tuning the precursor ratio, with more concentration of Cl element, the deeper blue we could achieved. The EL peak could be tuned from 520 nm to 478 nm when the Cl:Br was 0:10 and 9:1, respectively. At the same time, the effects of drive mode for the stability of PeLED was also explored. The PeLED demonstrated no distinct color change when driven by AC mode at 8 V for 3 min. While under DC mode for 3 min, the spectrum demonstrated significant red-shift. In this study, the influence of halied element to EL peak was investigated, the EL peak blueshifted with the increasement of Cl element. Furthermore, we confirmed the lift time of PeLED was enhanced under with AC mode.