Near-Band-Edge Optical Responses of CH3NH3PbCl3 Single Crystals: Photon Recycling of Excitonic Luminescence
Near-Band-Edge Optical Responses of CH3NH3PbCl3 Single Crystals: Photon Recycling of Excitonic Luminescence
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DOI：
10.1103/physrevlett.120.057404
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发表时间：
2018-02-01
影响因子：
8.6
通讯作者：
Kanemitsu, Yoshihiko
中科院分区：
文献类型：
--
作者：
Yamada, Takumi;Aharen, Tomoko;Kanemitsu, Yoshihiko
从基础物理和光子器件应用的角度来看，卤化铅钙钛矿的带隙和激子能量的确定是非常重要的。利用光致发光激发谱（PLE）研究了CH_3NH_3PbCl_3单晶在近带边能量区的光学性质。单光子PLE谱在3.11 eV处出现1s激子峰。相反，双光子PLE光谱没有表现出峰结构。这表明激子发光的光子再循环。通过分析激子的空间分布和光子再循环，我们得到了3.15 eV的带隙能量和41 meV的激子结合能。
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.