Resolving Enhanced Mn2+ Luminescence nearthe Surface of CsPbCl3 with Time-Resolved CathodoluminescenceImaging
2020
Mn2+ doping of lead halide perovskites has garnered
recent interest because it produces stable orange luminescence in
tandem with perovskite emission. Here, we observe enhanced Mn2+ luminescence at the edges of Mn2+-doped CsPbCl3 perovskite microplates and suggest an explanation for its
origin using the high spatiotemporal resolution of time-resolved cathodoluminescence
(TRCL) imaging. We reveal two luminescent decay components that we
attribute to two different Mn2+ populations. While each
component appears to be present both near the surface and in the bulk,
the origin of the intensity variation stems from a higher proportion
of the longer lifetime component near the perovskite surface. We suggest
that this higher emission is caused by an increased probability of
electron–hole recombination on Mn2+ near the perovskite
surface due to an increased trap concentration there. This observation
suggests that such surface features have yet untapped potential to
enhance emissive properties via control of surface-to-volume ratio.
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