Wu, ChaoYang, GangHumphrey, MarkZhang, Chi2020-04-080010-8545http://hdl.handle.net/1885/202812Second-order nonlinear optical (NLO) crystals functioning in the ultraviolet (UV) and deep-ultraviolet (deep-UV) regions are critically important as frequency conversion materials for all-solid-state UV laser devices. In this review, we focus on recent studies of inorganic UV and deep-UV NLO crystals with wide UV transparency and SHG efficiency. Following an introduction describing crystal-design strategies for UV and deep-UV NLO materials, the manuscript is organized according to the type of inorganic anions (borates, carbonates, nitrates and phosphates). Special attention is given to the crystal structures, second-order NLO properties, and structure–property correlations. The concluding remarks highlight future prospects in the field, with emphasis on the superiority of the different types of UV and deep-UV NLO crystals and the importance of large-size crystal growth for practical application in electro-optic devices.This research was financially supported by the National Natural Science Foundation of China (Nos. 51432006, 50925207 and 51172100), the Ministry of Science and Technology of China (No. 2011DFG52970), the Ministry of Education of China for the Changjiang Innovation Research Team (No. IRT13R24), the Ministry of Education and the State Administration of Foreign Experts Affairs for the 111 Project (No. B13025), 100 Talents Program of CAS, and the Innovation Program of Shanghai Municipal Education Commission. M.G.H. and C.Z. thank the Australian Research Council for support.30 pagesapplication/pdfen-AU© 2018 Elsevier B.V. . Elsevier requires authors posting their accepted manuscript to attach a non-commercial Creative Commons user license (CC-BY-NC-ND). https://www.elsevier.com/about/policies/sharing#definitions This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ (Publisher journal website as of 14/4/2020)Borates, Carbonates, Nitrates, Phosphates, Crystal structure, SHG property2018-11-1510.1016/j.ccr.2018.02.0172019-11-25