| Literature DB >> 26263192 |
Yasuhiro Yamada1, Takumi Yamada1, Le Quang Phuong1, Naoki Maruyama1, Hidetaka Nishimura1, Atsushi Wakamiya1, Yasujiro Murata1, Yoshihiko Kanemitsu1.
Abstract
The dynamic optical properties of perovskite CH3NH3PbI3 single crystals were studied by means of time-resolved photoluminescence (PL) spectroscopy at room temperature. The PL peak under one-photon excitation exhibits a red-shift with elapsing time, while two-photon PL is time-independent and appears at lower energy levels. The low-energy two-photon PL can be attributed to emissions from the localized states because of strong band-to-band absorption and photon re-absorption of the emitted light in the interior region. We revealed that the PL behaviors can be explained by the diffusion of photocarriers generated in the near-surface region to the interior region. The excitation fluence dependence of the one-photon PL dynamics is also discussed in terms of the electron-hole radiative recombination and carrier diffusion effects.Entities:
Year: 2015 PMID： 26263192 DOI： 10.1021/jacs.5b04503
Source DB: PubMed Journal: J Am Chem Soc ISSN： 0002-7863 Impact factor: 15.419