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Updated: Feb 14, 2026

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Near-Band-Edge Optical Responses of CH_{3}NH_{3}PbCl_{3} Single Crystals: Photon Recycling of Excitonic Luminescence
Takumi Yamada1, Tomoko Aharen1, Yoshihiko Kanemitsu1
1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
Abstract:
The determination of the band gap and exciton energies of lead halide perovskites is very important from the viewpoint of fundamental physics and photonic device applications. By using photoluminescence excitation (PLE) spectra, we reveal the optical properties of CH_{3}NH_{3}PbCl_{3} single crystals in the near-band-edge energy regime. The one-photon PLE spectrum exhibits the 1s exciton peak at 3.11 eV. On the contrary, the two-photon PLE spectrum exhibits no peak structure. This indicates photon recycling of excitonic luminescence. By analyzing the spatial distribution of the excitons and photon recycling, we obtain 3.15 eV for the band gap energy and 41 meV for the exciton binding energy.
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