open access

https://hdl.handle.net/2115/79748

Photon Recycling by Energy Transfer in Piezochemically Synthesized and Close-Packed Methylammonium Lead Halide Perovskites

英語

2019-11-14

American Chemical Society

The Journal of Physical Chemistry C

123(45)

27752-27758

Photon recycling by multiple reabsorption-emission is responsible for the long-range energy transport in large crystals and thick films of lead halide perovskites, resulting in red-shifted and delayed emission. Apart from such a radiative process, nonradiative energy transfer influences photon recycling in perovskites with close-packed donor-acceptor-type states. In this study, we report the role of nonradiative energy transfer on photon recycling in piezochemically synthesized and close-packed pure and mixed halide methylammonium lead perovskites. Here, the pressure applied to precursors of perovskites helps us to synthesize and close-pack perovskite crystallites into pellets. Nonetheless, interestingly, we find that the applied pressure redistributes the emission maxima or band- gap of these perovskites. The temporally and spectrally resolved photoluminescence from the mixed halide sample unveils nonradiative energy transfer from a higher (bromide) to a lower (iodide) band-gap domain, where the rate of relaxation of the bromide domain is higher than that of the pure bromide perovskite. These results help us to confirm the role of nonradiative energy transfer on photon recycling in perovskites.

学術雑誌論文

Accepted Manuscript

This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.jpcc.9b07003 .

1932-7447