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A new ultraviolet nonlinear optical (NLO) material, Pb3Mg3TeP2O14 (PMTP), has been synthesized and characterized. The chiral material exhibits a large second harmonic generation (SHG) response of 13.5 × KDP (600 × α-SiO2), and the shortest absorption edge (250 nm) of reported materials with a strong SHG response (>10 × KDP). PMTP has a three-dimensional crystal structure of corner-shared MgO4, PO4, and TeO6 polyhedra, which form a TeMg3P2O14∞ framework. Electronic structure calculations revealed that the stereoactive lone pair on the Pb(2+) cation is critical to producing the substantial NLO response and that the NLO activity is further enhanced by the presence of triply bidentate Te(6+) cations found in Te-O-O-Pb rings.
Yu et al. (Sun,) studied this question.