Light-Emitting Diodes with Manganese Halide Tetrahedron Embedded in Anti-Perovskites

The
formability of antiperovskite [MX4]­XA3-type
(A­(I) = alkali metals; M­(II) = transition metals; X = Cl, Br,
I) can be predicted by building the analysis theory. To validate the
prediction model, a series of cesium–manganese antiperovskite
single crystals with different halogen mixing ratios were synthesized,
which not only have [MX4]­XA3-type structures
but also are ideal luminescent materials. As the most pure green emission
fluorescent antiperovskite, [MnCl2Br2]­BrCs3 shows 520 nm emission with the high photoluminescence quantum
yield (93.5%) at room temperature and ultrastable luminescent color
from 77 to 523 K due to the strict confinement of high-density luminescent
centers. By fabricating the perovskite film with the double-source
thermal evaporation method, the first all-inorganic cesium–manganese
halide antiperovskite light-emitting diode is reported, with maximum
external quantum efficiency up to 12.5%, maximum luminance up to 3990
cd m–2, and half-life of 756 min operated at 5.0
V.