Two alkali-metal sulfamates nonlinear optical (NLO) crystals, Li(NH₂SO₃) and Na(NH₂SO₃), have been obtained through the facile evaporation method. Li(NH₂SO₃) crystallizes in the polar space group Pca2₁ (No.29). The structure of Li(NH₂SO₃) can be described as a 3D network formed by [LiO₄]^7- polyhedral connecting with NH₂SO₃^- tetrahedra through corner-sharing. Na(NH₂SO₃) crystallizes in the polar space group P2₁2₁2₁ (No.19). The structure of Na(NH₂SO₃) can be described as a 3D network formed by distorted [NaO₆]^11- octahedral connecting with NH₂SO₃^- tetrahedra through corner-sharing. The UV-Vis-near-infrared spectra demonstrate that Li(NH₂SO₃) and Na(NH₂SO₃) possessed large optical band gaps of 5.25 and 4.81 eV, respectively. Powder second-harmonic generation (SHG) measurements demonstrate that the SHG intensity of Li(NH₂SO₃) and Na(NH₂SO₃) were 0.32 times and 0.31 times that of KH₂PO₄, respectively. First-principles calculations confirm the nonlinear optical performance mainly derived from the synergistic effect of amino sulfonate anions and alkali metal oxide anionic polyhedra.

为钝化二维钙钛矿晶体中的缺陷并改善晶体质量，将氯苯添加到(PMA)₂PbBr₄钙钛矿前驱体中(PMA⁺=C₆H₅CH₂NH₃⁺)，并通过冷却控温结晶法制备大尺寸高质量的钙钛矿单晶。采用粉末X射线衍射、扫描电子显微镜、透射电子显微镜、X射线光电子能谱和稳态-瞬态荧光光谱对钙钛矿晶体的结构、形貌和光学特性进行系统的表征测试。研究结果表明，添加浓度为0.38 mol·L^-1的氯苯，能够有效调控晶体生长速率，增强结晶取向并钝化表、界面缺陷，显著抑制光生载流子的非辐射复合。此外，利用氯苯添加剂能够调控阳离子堆叠效应诱导改变晶体的微观应变，从而影响电子-声子耦合作用，改善材料的光电子特性。优化后晶体的双光致发光峰强度显著增强，0.38 mol·L^-1氯苯钝化晶体的低能发射峰出现红移且半高宽减小，这表明氯苯添加剂能有效缓解晶体表面和内部的畸变应力。