A UV transparent rare earth metal formate exhibiting second harmonic generation response and moderate birefringence
A rare earth metal formate,(C(NH2)3)[Er(HCOO)4],was prepared via an evaporation method.Benefiting from its non-centrosymmetric structure,optical property studies reveal that(C(NH2)3)[Er(HCOO)4]possessed a wide optical bandgap of 4.76 eV,moderate birefringence(0.066@546 nm),second harmonic generation(SHG)response(0.20 times that of KH2PO4(KDP)),and phase-matchable capabilities at 1 064 nm.Theoretical calculations and crys-tal structure analysis revealed that the optical properties can be attributed to the synergy effects of the(C(NH2)3)+,[ErO8],and HCOO-units.