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Two non-centrosymmetric mixed alkali metal and alkaline earth metal scandium borate nonlinear optical materials with short ultraviolet cutoff edges.

Wenhao LiuMing-Hsien LeeRuixin GuoJiyong Yao
Published in: Dalton transactions (Cambridge, England : 2003) (2023)
Rare earth borates, a subset of the essential nonlinear optical (NLO) materials, have sparked a significant amount of attention in recent years. In self-fluxing systems, two non-centrosymmetric scandium borates with classical B 5 O 10 groups, namely Rb 7 SrSc 2 B 15 O 30 (I) and Rb 7 CaSc 2 B 15 O 30 (II), were successfully discovered. Both I and II exhibit a short ultraviolet (UV) cutoff edge (<200 nm) and appropriate second-harmonic generation efficiency (∼0.76 × KH 2 PO 4 , ∼0.88 × KH 2 PO 4 at 1064 nm, respectively). According to theoretical calculations, it is speculated that the band gap and NLO characteristics of these two compounds are mostly derived from the B 5 O 10 group and the ScO 6 octahedron. Due to the short cutoff edges of I and II, they may be considered as potential NLO materials in the UV and even deep UV spectral ranges. Furthermore, the advent of I and II adds to the diversity of rare earth borates.
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