posted on 2020-03-16, 17:06authored byIsabella Antony K. J., Debrina Jana
Doping Mn2+ in CsPbCl3 nanocrystals (NCs)
has generated exciting optical properties, making it a potential candidate
for illumination and display applications. Also, it opens up a way
to substitute toxic Pb2+ partially by Mn2+.
Herein, a mesopore-mediated pathway has been investigated toward the
generation of Mn-doped CsPbCl3 NCs inside the alumina thin
film. Bottle-neck-shaped mesopores acting as “nanopots”
provide an ideal confined environment for the synthesis to occur at
room temperature and an ambient atmosphere. The Mn/Pb molar ratio
has been deliberately kept less than 1 to examine the extent of doping
within that limit, and a maximum of 29.4% substitution of Pb by Mn
has been achieved. The role of mesopores, solvents, and precursor
incorporation sequences in the synthetic procedure has been investigated
in detail along with the properties of the composite film. Bright
orange stable luminescent coating on large-area flexible plastic substrates
has been developed with this room temperature, ambient atmosphere
synthetic protocol. This strategy can be extended further toward doping
of other metals or generation of non-Pb perovskite NCs and their doped
counterparts, preferably at ambient conditions. Enhanced heat and
photostability of the composite films compared to the solution-processed
Mn/CsPbCl3 NCs makes them suitable for display applications.
Apart from that, because of the improved aerobic and moisture stability,
this Mn/CsPbCl3 NC mesoporous alumina composite film can
act as the heterogeneous catalyst in chemical reactions, and here,
as a proof of example, reduction of p-nitrophenol
using sodium borohydride has been demonstrated.