Upconverted excitonic photoluminescence from a two-dimensional lead-halide perovskite

Anti-Stokes photoluminescence (AS-PL) is an interesting optical phenomenon that can cause laser cooling in certain semiconductors where incident laser photons are efficiently converted into photons with higher energy. The underlying upconversion mechanism can be used to realize optical refrigerators...

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Bibliographic Details
Published in:The Journal of chemical physics 2019-12, Vol.151 (23), p.234709-234709
Main Authors: Yamada, Takumi, Aharen, Tomoko, Kanemitsu, Yoshihiko
Format: Article
Language:English
Subjects:
Excitons
Laser cooling
Lead compounds
Metal halides
Perovskites
Photoluminescence
Photons
Refrigerators
Single crystals
Upconversion
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Summary:Anti-Stokes photoluminescence (AS-PL) is an interesting optical phenomenon that can cause laser cooling in certain semiconductors where incident laser photons are efficiently converted into photons with higher energy. The underlying upconversion mechanism can be used to realize optical refrigerators, but suited materials need to be developed for actual applications. Here, we investigate the AS-PL properties of a two-dimensional (2D) perovskite PEA2PbI4 single crystal and compare them with those of a three-dimensional (3D) perovskite MAPbI3 single crystal. We find that, in the 2D perovskite PEA2PbI4, which has a large exciton binding energy, the free-exciton PL is dominant and that the measured upconversion gain spectra of both PEA2PbI4 and MAPbI3 crystals are similar. The AS-PL process in these perovskite single crystals is discussed.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.5129779