Synthesis, Growth And Frequency Conversion Application Of ZnMnCl₄（TPPO）₄ And Lead Halide Amine Perovskites

The thesis mainly introduced a kind of technique for the growth of crystal, to grow bulk optical crystal or nanoribbon, nanopiece or nanorod crystals using solvent technique (such as slow evaporation method, poor solvent diffusion method and temperature reducing method). So as to achieve a kinds of application in frequency conversion, including SHG (second harmonic generation), waveguiding and ASE (amplified spontaneous emission).This thesis is mainly divided into three parts:① Three crystal growth method, such as temperature reducing method, slow evaporation method with mixed solvent and poor solvent diffusion method crystal preparation method are introduced. Scale-up tetraphenylphosphonium bromide and triphenylphosphine sulfide single crystal were grown by poor solvent diffusion method and temperature reducing method with mixed solvents for the first time. The crystal growth equipment was build, optimized and upgraded, which has laid a solid foundation for the experimental work safely and efficiently then.② This part introduces the growth of ZnMnCl4 (TPPO)4 crystal by a guest-host combination of ZnCl2(TPPO)2 and MnCl2(TPPO)2 for the first time and the formation is bidirectional. It crystallizes in the acentric space group Fdd2. A mixed occupancy of zinc and manganese atoms was designed to form a noncentrosymmetric coordination compound, which exhibits the relatively strong second-order nonlinear properties. The powder of these crystal shows phase-matchable SHG effect that is twice that of KH2PO4 (KDP). The crystal has a broad optical transmission range, relatively good stability and a wide band gap. It is also magnetic and luminescent. The properties of this new make it a potential candidate for improved or even novel device③ Bulk single crystals of CH3NH3PbBr3 and H3NCH2CH2NH3PbBr4 have been grown using temperature lowering method for the first time. Compared with CH3NH3PbBr3, bulk colorless crystal H3NCH2CH2NH3PbBr4 showing bright PL emission. Smooth nanoribbon crystals have been fabricated with a new method that combined capillary action and slow evaporation for the performance of optical waveguide, which has a low optical loss of 9.6 dBmm-1 at 570 nm. Nanorod crystals of (BrH3NCH2CH2NH3)2PbBr4 have been grown by temperature lowering method with a space group of P21/n and an optical loss of 13.2 dBmm-1 at 580 nm. Microcrystals of H3NCH2CH2NH3PbCl4, BrH3NCH2CH2NH3Br PbCl2 have also been fabricated. All the hybrid perovskites crystals exhibit tunable PL emission and band gaps, and they also process potential scintillating application with nanoseconds decay time.