Journal Article Near-Band-Edge Optical Responses of CH3NH3PbCl3 Single Crystals: Photon Recycling of Excitonic Luminescence

Yamada, Takumi  ,  Aharen, Tomoko  ,  Kanemitsu, Yoshihiko

120 ( 5 ) 2018-02-02 , American Physical Society (APS)
新しい青色発光材料の出現 --有機無機ハイブリッドペロブスカイト半導体の光学特性を解明--. 京都大学プレスリリース. 2018-02-05.
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 CH3NH3PbCl3 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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