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    Fluorooxoborates: Novel Candidates for Deep-UV Nonlinear Optical Materials
    Shilie Pan1;
    1XINJIANG TECHNICAL INSTITUTE OF PHYSICS & CHEMISTRY, CHINESE ACADEMY OF SCIENCES, Urumqi, China;
    PAPER: 5/Chemistry/Regular (Oral)
    SCHEDULED: 12:10/Thu. 24 Oct. 2019/Aphrodite A (100/Gr. F)



    ABSTRACT:
    The ever-growing application of deep-ultraviolet (deep-UV, I� < 200 nm) nonlinear optical (NLO) materials in various fields requires searching for candidates to generate the deep-UV lasers through direct second-harmonic generation (SHG) method. Among them, fluorooxoborates, benefiting from the large optical band gap, high anisotropy and ever-greater possibility to form non-centrosymmetric structures activated by the large polarization of the functionalized [BO<sub>x</sub>F<sub>4-x</sub>]<sup>(x+1)-</sup> (x =1, 2 and 3) building blocks, have been considered as the new fertile fields for searching the deep-UV NLO materials.<sup>1,2</sup> Two series of fluorooxoborates AB<sub>4</sub>O<sub>6</sub>F (A = NH<sub>4</sub>, Na, Rb, Cs, K/Cs and Rb/Cs)<sup>3-6</sup> and MB<sub>5</sub>O<sub>7</sub>F<sub>3</sub> (M = Ca and Sr)<sup>7,8</sup> were rationally designed and synthesized, which not only inherit the favorable structural characteristics of KBBF, but also possess superior optical properties. Property characterizations reveal that these two series possess the optical properties (deep-UV cutoff edges, large SHG responses, improved growth habit and also large birefringence to ensure the phase matching behavior in the deep-UV spectral region, etc.) required for the deep-UV NLO applications, which make them potential candidates to produce the deep-UV coherent light by the direct SHG process.

    References:
    References
    (1) Mutailipu, M and Pan, S. L.* etc. Acc. Chem. Res. 2019, DOI: 10.1021/acs.accounts.8b00649
    (2) Zhang, B. B and Pan, S. L.* etc. Angew. Chem. Int. Ed. 2017, 56, 3916.
    (3) Shi, G. Q.; Pan, S. L* and Poeppelmeier, K. R.* etc. J. Am. Chem. Soc. 2017, 139, 10645.
    (4) Wang, X. F and Pan, S. L.* etc. Angew. Chem. Int. Ed. 2017, 56, 14119.
    (5) Wang, Y and Pan, S. L.* etc. Angew. Chem. Int. Ed. 2018, 57, 2150.
    (6) Zhang, Z. Z and Pan, S. L.* etc. Angew. Chem. Int. Ed. 2018, 57, 6577.
    (7) Mutailipu, M and Pan, S. L.* etc. Angew. Chem. Int. Ed. 2018, 57, 6095.
    (8) Zhang, Z. Z and Pan, S. L.* etc. Inorg. Chem. 2018, 57, 4820.