Evidence of Short-Lived High-Energy Emissive State and Triplet Character of the Self-Trapped Exciton in Cs3Cu2I5 Perovskite
Shovon Chatterjee,
Puspal Mukherjee,
Arghya Sen
et al.
Abstract:Cs 3 Cu 2 I 5 perovskite displays a Stokes-shifted photoluminescence (PL) at 445 nm, attributed to the self-trapped excitons (STEs). Unlike that observed in other perovskite materials, the free-exciton emission is not evidenced in this case. Herein, we reveal the existence of a short-lived high-energy emission centered around 375 nm through the reconstruction of time-resolved emission spectra (TRES), which is independent of the shape/size of Cs 3 Cu 2 I 5 perovskite. This high-energy emission is proposed to or… Show more
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