Linear and nonlinear optical responses in perovskite-like formate salts
Two mixed organic cationic hybrid formate salts,(CH(NH2)2)[RE(HCOO)4](RE=Y,Er),have been obtained by in situ solvothermal synthesis.The two materials are isostructural(chiral space group C2221)and feature interest-ing perovskite-like structures.Photophysical studies including linear and nonlinear optical characteristics were per-formed.(CH(NH2)2)[Y(HCOO)4]and(CH(NH2)2)[Er(HCOO)4]exhibited wide optical bandgaps of 5.59 and 5.61 eV,corresponding to the UV absorption edges of 222 and 221 nm,respectively.Powder second harmonic generation(SHG)measurements demonstrate that the SHG effects of(CH(NH2)2)[Y(HCOO)4]and(CH(NH2)2)[Er(HCOO)4]were 0.32 and 0.37 times that of benchmark KH2PO4(KDP),respectively.The birefringences were measured to be 0.013 and 0.015 for(CH(NH2)2)[Y(HCOO)4]and(CH(NH2)2)[Er(HCOO)4],respectively.First-principles studies show that two π-conjugated(CH(NH2)2)+and HCOO-groups are the main contributors to the optical properties.CCDC:2312145,(CH(NH2)2)[Y(HCOO)4];2312159,(CH(NH2)2)[Er(HCOO)4].
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