期刊
CHEMICAL SCIENCE
卷 12, 期 11, 页码 4014-4020出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sc00080b
关键词
-
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
By partially substituting oxygen atoms with fluoride atoms in conventional non-pi-conjugated tetrahedral functional building units, the NLO crystals can exhibit enhanced crucial properties such as SHG response and birefringence. NH4BAsO4F (ABAF) shows superior performance compared to the majority of other crystals, achieving a preferable balance of key properties.
Nonlinear optical (NLO) crystals assembled with conventional non-pi-conjugated tetrahedral functional building units (FBUs), generally referring to [PO4] and [BO4], usually exhibit weak nonlinearity and poor birefringence. It is currently proposed that partially substituting oxygen atoms with fluoride atoms in these FBUs could enhance these crucial properties. Hence, we investigated for the first time the NLO-related properties of NH4BAsO4F (ABAF), which was constructed from tetrahedral [BO3F] and [AsO4] FBUs, and enhancements of these properties were observed in this material, that is large second-harmonic generation (SHG) response (2 x KDP) and improved birefringence (0.03 at 1064 nm). Notably, both SHG coefficient and birefringence of ABAF exceeded those of a great majority of phosphates, sulfates, or boron phosphates and achieved a preferable balance. It is interesting that ABAF shows vast structural similarities to the typical NLO crystals Sr2Be2B2O7 (SBBO) and KBe2BO3F2 (KBBF), which might be the partial reason why it showed improvement in these vital properties. This work may afford some inspiration for enhancing the key performances of NLO crystals assembled with non-pi-conjugated tetrahedra.
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