posted on 2023-11-03, 13:33authored byQiankai Ba, Abhishek Meena, Atanu Jana
The limited Mn2+ doping that occurs in lead
halide perovskites
has been widely described, while the Pb2+ doping that occurs
in Mn2+ halide perovskites has not been studied well. Generally,
a large amount of doping of Mn2+ in lead halide perovskite
degrades the perovskite structure; eventually, high orange luminescence
of Mn2+ dopant has not been achieved. In our present study,
we followed a reverse strategy, i.e., Pb2+ doping in Mn2+ halide perovskites, to increase the amount of Mn2+ in halide perovskites through the high-energy ball milling method.
This strategy yields bright-fluorescence orange light-emitting Mn2+-doped perovskite with a Mn/Pb ratio of 95%, which is the
highest among Mn2+-doped perovskites. Zero-dimensional
(0D) Mn2+ perovskites and two-dimensional (2D) Pb2+-doped Mn2+-based perovskites were successfully synthesized
and characterized. During the mechanochemical engineering, Pb2+ ions partially occupy the site of Mn2+ ions and
act as a luminescence activator. Mn2+-based 2D perovskites
with the proper amounts of Pb2+ ions as dopant ions and
phenylethylammonium (PEA+) as dielectric organic cations
show enhanced stability in water. The dual-emissive properties of
these 2D-Pb2+-doped Mn2+-based perovskites were
also investigated by using single-particle imaging fluorescence. We
believe that these findings will pave the way for designing eco-friendly
dimension and bandgap tunable layered perovskites.