Advances in the generation of coherent lasers below 200 nm and its driven equipment and technologies have greatly spurred the development of nonlinear optical (NLO) materials with the capability to phase-matching in the deep-ultraviolet (deep-UV) spectral regions. However, few crystals can meet the technical demands and studies to date have focused mainlyon finding the next competitive candidatesby chemists and material scientists. For a long time, KBBF and its isomorphic RBBF NLO crystals have been regarded as the sole materials that could practically produce the deep-UV coherent lasers with the wavelengths lower than 200 nm by the direct SHG method. Against this background, several systems including traditionally advantageous and newly developed systems have been found and studied by both experimental and theoretical methods in the last few years.

　　Recently, a research group led by Prof. Shilie Pan at Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Science, is invited to write a Review article for discussing the Deep-Ultraviolet Nonlinear Optical Materials.The review was published in Angewandte Chemie International Edition with title of “Emergent Deep‐Ultraviolet Nonlinear Optical Candidates”.

　　In this invited review, the authors provide a comprehensive review of the developments of emergent candidates in the field of deep-UV NLO materials, discussing the recent efforts and active advances in searching of superior systems and in understanding of its structure-property relationships. The emergent inorganic systems, including borates, fluorooxoborates, phosphates, fluorophosphates, carbonates, nitrates, and mixed anions systems are analyzed. They aim to provide a clear perspectiveon the current emergent deep-UV NLO candidates, and to accelerate the finding of next candidates with high performances tomeet the urgent demands.

　　https://www.onlinelibrary.wiley.com/doi/10.1002/ange.201913974