Journal
CHEMISTRY OF MATERIALS
Volume 33, Issue 11, Pages 4240-4246Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c01274
Keywords
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Funding
- Natural Science Foundation of Tianjin [20JCJQJC00060, 19JCZDJC38200]
- National Natural Science Foundation of China [22071179, 51890864, 51802217, 51972230, 61835014, 51890865]
- National Key RD Program [2016YFB0402103]
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KBBF is the only NLO crystal that can generate deep-UV light through SHG, but its toxic nature and crystal structure limitations have led to the design and synthesis of KMLBO, a beryllium-free borate with potential deep-UV NLO crystal applications. KMLBO exhibits promising performances and overcomes the crystal layer habit of KBBF, making it a potential candidate for deep-UV NLO crystals.
KBe2BO3F2 (KBBF) is the sole nonlinear optical (NLO) crystal that can practically generate deep-ultraviolet (UV) coherent light by a direct second-harmonic generation (SHG) process. However, the toxic BeO and crystal layer habit limit its application. With this background, a new beryllium-free borate, K5Mg2La3(BO3)(6 )(KMLBO), has been designed and synthesized through a high-temperature solution method. KMLBO crystallizes into the noncentrosymmetric space group P31m (No. 157) and features a three-dimensional framework structure consisting of alveolate [LaBO3](infinity) layers further tightly bound via interlayer [BO3](3-) groups. KMLBO not only exhibits desirable performances including deep-UV transparency, large SHG (similar to 3.1 XKH2PO4), and phase-matchability but also overcomes the crystal layer habit of KBBF, demonstrating that it is a potential deep-UV NLO crystal.
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