Dynamic Optical Properties of CH3NH3Pbl3 Single Crystals As Revealed by One- and Two-Photon Excited Photoluminescence Measurements
Dynamic Optical Properties of CH3NH3Pbl3 Single Crystals As Revealed by One- and Two-Photon Excited Photoluminescence Measurements
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DOI：
10.1021/jacs.5b04503
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发表时间：
2015-08-26
影响因子：
15
通讯作者：
Kanemitsu, Yoshihiko
中科院分区：
文献类型：
--
作者：
Yamada, Yasuhiro;Yamada, Takumi;Kanemitsu, Yoshihiko
利用时间分辨光致发光（PL）光谱研究了钙钛矿CH(3)NH(3)Pbl(3)单晶的室温动态光学性质。单光子激发下的 PL 峰随着时间的推移呈现红移，而双光子 PL 与时间无关，并且出现在较低的能级。低能双光子PL可归因于局域态的发射，这是由于内部区域发射光的强带间吸收和光子再吸收。我们发现，PL 行为可以通过近表面区域产生的光载流子扩散到内部区域来解释。还根据电子-空穴辐射复合和载流子扩散效应讨论了单光子 PL 动力学的激发注量依赖性。
The dynamic optical properties of perovskite CH(3)NH(3)Pbl(3) 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.