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Synthesis and optical properties of the first lead borate bromide with isolated BO3 groups: Pb2Ba3(BO3)3Br
Qun Jing1, Xiaoyu Dong, Zhihua Yang
1Key Laboratory of Functional Materials and Devices for Special Environments of CAS, Xinjiang Technical Institute of Physics & Chemistry of CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi 830011, China. zhyang@ms.xjb.ac.cn slpan@ms.xjb.ac.cn.
Abstract:
Single crystals of a new compound Pb2Ba3(BO3)3Br have been grown by a spontaneous crystallization method. They crystallize in the noncentrosymmetric orthorhombic space group C2221 with isolated BO3 triangles and distorted PbO polyhedra. UV-Vis-NIR diffused reflectance spectroscopy measurements indicate that the absorption edge is at 326 nm. Second-harmonic generation (SHG) measurements using 1064 nm radiation show that Pb2Ba3(BO3)3Br exhibits relative large NLO response about 3.1× that of KH2PO4 (KDP) and is type I phase-matchable. First-principles electronic structure calculations show that the isolated BO3 groups and PbO4 polyhedra play an important role in the total SHG response.
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