# Synthesis, Structure and Photoluminescence Properties of 2D Organic-Inorganic Hybrid Perovskites  
[PERSON]  
1 School of Mechanical and Electrical Engineering, Hubei Key Laboratory of Optical Information and Pattern Recognition, School of Optical Information and Energy Engineering, Wuhan Institute of Technology, Wuhan 430073, China; [EMAIL_ADDRESS] (Y.L. ); [EMAIL_ADDRESS] (F.Y. ); [EMAIL_ADDRESS] (Z.H. ); [EMAIL_ADDRESS] (S.L. ); [EMAIL_ADDRESS] (L.X. ); [EMAIL_ADDRESS] (X.H.) 1  
[PERSON]  
1 School of Mechanical and Electrical Engineering, Hubei Key Laboratory of Optical Information and Pattern Recognition, School of Optical Information and Energy Engineering, Wuhan Institute of Technology, Wuhan 430073, China; [EMAIL_ADDRESS] (Y.L. ); [EMAIL_ADDRESS] (F.Y. ); [EMAIL_ADDRESS] (Z.H. ); [EMAIL_ADDRESS] (S.L. ); [EMAIL_ADDRESS] (L.X. ); [EMAIL_ADDRESS] (X.H.) 1  
[PERSON]  
1 School of Physics, Huazhong University of Science & Technology, Wuhan 430073, China; [EMAIL_ADDRESS] 1  
[PERSON]  
1 School of Mechanical and Electrical Engineering, Hubei Key Laboratory of Optical Information and Pattern Recognition, School of Optical Information and Energy Engineering, Wuhan Institute of Technology, Wuhan 430073, China; [EMAIL_ADDRESS] (Y.L. ); [EMAIL_ADDRESS] (F.Y. ); [EMAIL_ADDRESS] (Z.H. ); [EMAIL_ADDRESS] (S.L. ); [EMAIL_ADDRESS] (L.X. ); [EMAIL_ADDRESS] (X.H.) 1  
[PERSON]  
1 School of Physics, Huazhong University of Science & Technology, Wuhan 430073, China; [EMAIL_ADDRESS] 1  
[PERSON]  
1 School of Mechanical and Electrical Engineering, Hubei Key Laboratory of Optical Information and Pattern Recognition, School of Optical Information and Energy Engineering, Wuhan Institute of Technology, Wuhan 430073, China; [EMAIL_ADDRESS] (Y.L. ); [EMAIL_ADDRESS] (F.Y); [EMAIL_ADDRESS] (Z.H. ); [EMAIL_ADDRESS] (S.L. ); [EMAIL_ADDRESS] (L.X. ); [EMAIL_ADDRESS] (X.H.) 1  
[PERSON]  
1 School of Physics, Huazhong University of Science & Technology, Wuhan 430073, China; [EMAIL_ADDRESS] 1  
[PERSON]  
1 School of Mechanical and Electrical Engineering, Hubei Key Laboratory of Optical Information and Pattern Recognition, School of Optical Information and Energy Engineering, Wuhan Institute of Technology, Wuhan 430073, China; 13212799763@163.  
structure [7]. The inorganic component offers the opportunities for high carrier mobility and a wide range of bandgap [8; 9]. The organic component provides the possibility of structural diversity, highly efficient luminescence and plastic mechanical properties [10]. Importantly, these 2D layered perovskite crystals have a direct bandgap [11] with a high density of state (DOS) contributed by Pb orbitals, and thus exhibit strong light-matter interaction. In this regard, the ultrathin 2D layered perovskite crystals have shown rich optical properties, such as luminescent deep blue emission [12], exciton effect and high absorption [13]. In addition, compared with traditional polycrystalline perovskite film, 2D single-crystal perovskite promises dramatically reduced defects and notably enhanced carrier diffusion length [14]. Consequently, the improved optical and electrical properties guarantee the potential of such a new family of solution-processed semiconductors in nanoscale optoelectronic devices. An organic layer with a large energy band gap is equivalent to a potential barrier. The organic layer and inorganic layer are arranged alternately to form a multi-quantum well structure. The excitons in the inorganic layer display special optical properties, such as nonlinear absorption [15] and excitonic emission [16]. The strong exciton peaks in the optical spectra are attributed to the large exciton binding energy at room temperature [17]. Organic-inorganic hybrid perovskites have great potential applications in solar cells [18; 19; 20], electroluminescent devices [21; 22], nanolasers [23; 24; 25], and photodetections [26; 27]. In 2009, [PERSON] et al. initially studied solar cells with the perovskite CH\({}_{3}\)NH\({}_{3}\)PbI\({}_{3}\), yielding a power conversion efficiency (PCE) of only 3.81% [28].