Noncentrosymmetric tellurite halides created by a depolymerization strategy: toward strong SHG intensity and wide bandgap.

ABSTRACT: The design and synthesis of nonlinear optical (NLO) materials with a strong second harmonic generation (SHG) effect and wide band gap is a long-standing challenge because of their inverse relationship, especially for metal tellurites. We found that a lower degree of polymerization of tellurite groups corresponds to a higher proportion of non-centrosymmetric (NCS) structures formed. Based on Pauling's rule #4, introduction of cations (Al³⁺/Ga³⁺) with higher coordination numbers and lower valence states than Te⁴⁺ into the reaction system decreases the connectivity among tellurite groups. By regulating the reaction conditions, CS Ga(Te₃O₇)Br and NCS M₂(OH)(TeO₃)(Te₂O₅)X (M = Al, Ga; X = Br, Cl)

SUBMITTER: Zhou DD 

PROVIDER: S-EPMC11575565 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature