REFERENCES

1. Zhang R, Mao X, Yang Y, et al. Air-stable, lead-free zero-dimensional mixed bismuth-antimony perovskite single crystals with ultra-broadband emission. Angew Chem Int Ed Engl 2019;58:2725-9.

2. Zhou L, Liao JF, Huang ZG, et al. A highly red-emissive lead-free indium-based perovskite single crystal for sensitive water detection. Angew Chem Int Ed Engl 2019;58:5277-81.

3. Zhou C, Lin H, Tian Y, et al. Luminescent zero-dimensional organic metal halide hybrids with near-unity quantum efficiency. Chem Sci 2018;9:586-93.

4. Saouma FO, Stoumpos CC, Wong J, Kanatzidis MG, Jang JI. Selective enhancement of optical nonlinearity in two-dimensional organic-inorganic lead iodide perovskites. Nat Commun 2017;8:742.

5. Hao F, Stoumpos CC, Cao DH, Chang RPH, Kanatzidis MG. Lead-free solid-state organic-inorganic halide perovskite solar cells. Nature Photon 2014;8:489-94.

6. Xing G, Mathews N, Sun S, et al. Long-range balanced electron- and hole-transport lengths in organic-inorganic CH₃NH₃PbI₃. Science 2013;342:344-7.

7. Li L, Shang X, Wang S, et al. Bilayered hybrid perovskite ferroelectric with giant two-photon absorption. J Am Chem Soc 2018;140:6806-9.

8. You YM, Liao WQ, Zhao D, et al. An organic-inorganic perovskite ferroelectric with large piezoelectric response. Science 2017;357:306-9.

9. Connor BA, Leppert L, Smith MD, Neaton JB, Karunadasa HI. Layered halide double perovskites: dimensional reduction of Cs₂AgBiBr₆. J Am Chem Soc 2018;140:5235-40.

10. Chen B, Li T, Dong Q, et al. Large electrostrictive response in lead halide perovskites. Nat Mater 2018;17:1020-6.

11. Huang L, Wang Q, He F, et al. Synthesis, crystal structures and nonlinear optical properties of polymorphism: α- and β-RbHgI₃·H₂O. J Alloys Compd 2019;771:547-54.

12. Zhou C, Lin H, Neu J, et al. Green emitting single-crystalline bulk assembly of metal halide clusters with near-unity photoluminescence quantum efficiency. ACS Energy Lett 2019;4:1579-83.

13. Li Z, Li Y, Liang P, Zhou T, Wang L, Xie R. Dual-band luminescent lead-free antimony chloride halides with near-unity photoluminescence quantum efficiency. Chem Mater 2019;31:9363-71.

14. Wu Q, Meng X, Zhong C, Chen X, Qin J. Rb₂CdBr₂I₂: a new IR nonlinear optical material with a large laser damage threshold. J Am Chem Soc 2014;136:5683-6.

15. Zhang G, Li Y, Jiang K, et al. A new mixed halide, Cs₂HgI₂Cl₂: molecular engineering for a new nonlinear optical material in the infrared region. J Am Chem Soc 2012;134:14818-22.

16. Zheng X, Liu Y, Liu G, et al. Crystalline mixed halide halobismuthates and their induced second harmonic generation. Chem Mater 2016;28:4421-31.

17. Huang Y, Meng X, Gong P, Lin Z, Chen X, Qin J. A study on K₂SbF₂Cl₃ as a new mid-IR nonlinear optical material: new synthesis and excellent properties. J Mater Chem C 2015;3:9588-93.

18. Liu X, Yang C, Wu Q, Sun J, Liang F. From BiF₃ to BiF₃·H₂O: diverse Bi(iii) coordination for structural transformation and birefringence regulation. CrystEngComm 2020;22:6838-46.

19. Yang C, Guo F, Zhang Y, et al. Luminescence change from orange to blue for zero-dimensional Cs₂InCl₅(H₂O) metal halides in water and a new post-doping method. Chem Asian J 2021;16:1619-25.

20. Cordero F, Craciun F, Paoletti AM, Zanotti G. Structural transitions and stability of FAPbI₃ and MAPbI₃: the role of interstitial water. Nanomaterials (Basel) 2021;11:1610.

21. Gong P, Luo S, Huang Q, et al. An alkaline tin(II) halide compound Na₃Sn₂F₆Cl: synthesis, structure, and characterization. J Solid State Chem 2017;248:104-8.

22. Gong P, Luo S, Xiao K, et al. Structure and characterization of a zero-dimensional alkali tin dihalides compound Cs₃Sn₃F₂Cl₇ with the [Sn₂F₂Cl₄]^2- clusters. Inorg Chem 2017;56:3081-6.

23. Gong P, Yang Y, You F, et al. A SbF₃Cl (A = Rb, Cs): structural evolution from centrosymmetry to noncentrosymmetry. Cryst Growth Des 2019;19:1874-9.

24. Song G, Li M, Yang Y, et al. Lead-free tin(IV)-based organic-inorganic metal halide hybrids with excellent stability and blue-broadband emission. J Phys Chem Lett 2020;11:1808-13.

25. Gong P, Luo S, Yang Y, et al. Nonlinear optical crystal Rb₄Sn₃Cl₂Br₈: synthesis, structure, and characterization. Cryst Growth Des 2018;18:380-5.

26. Song G, Li Z, Gong P, Xie R, Lin Z. Tunable white light emission in a zero-dimensional organic-inorganic metal halide hybrid with ultra-high color rendering index. Adv Optical Mater 2021;9:2002246.

27. Song G, Li M, Zhang S, et al. Enhancing photoluminescence quantum yield in 0D metal halides by introducing water molecules. Adv Funct Mater 2020;30:2002468.

28. Salami TO, Zavalij PY, Oliver SR. Synthesis and crystal structure of two tin fluoride materials: NaSnF3 (BING-12) and Sn3F3PO4. J Solid State Chem 2004;177:800-5.

29. Zemnukhova LA, Fedorishcheva GA. Study of isomorphism in fluorine-containing antimony(III) complexes. Russ Chem Bull 1999;48:104-9.

30. Clark SJ, Segall MD, Pickard CJ, et al. First principles methods using CASTEP. Z Kristallogr Cryst Mater 2005;220:567-70.

31. Wang CS, Klein BM. First-principles electronic structure of Si, Ge, GaP, GaAs, ZnS, and ZnSe. II. Optical properties. Phys Rev B 1981;24:3417-29.