High Color Purity Lead-Free Perovskite Light-Emitting Diodes via Sn Stabilization.

ABSTRACT: Perovskite-based light-emitting diodes (PeLEDs) are now approaching the upper limits of external quantum efficiency (EQE); however, their application is currently limited by reliance on lead and by inadequate color purity. The Rec. 2020 requires Commission Internationale de l'Eclairage coordinates of (0.708, 0.292) for red emitters, but present-day perovskite devices only achieve (0.71, 0.28). Here, lead-free PeLEDs are reported with color coordinates of (0.706, 0.294)-the highest purity reported among red PeLEDs. The variation of the emission spectrum is also evaluated as a function of temperature and applied potential, finding that emission redshifts by <3 nm under low temperature and by <0.3 nm V^-1 with operating voltage. The prominent oxidation pathway of Sn is identified an

SUBMITTER: Liang H 

PROVIDER: S-EPMC7175260 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature