New lead-iodide formates with a strong second-harmonic generation response and suitable birefringence obtained by the substitution strategy |
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| Authors: | Xiang-Yu Zhang Zi-Qi Zhou Wen-Xiu Bao Hong-Xin Tang Rui-Biao Fu Zu-Ju Ma Xin-Tao Wu |
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| Affiliation: | State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002 P. R. China.; Science ＆ Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian 350108 P. R. China ; School of Environmental and Materials Engineering, Yantai University, Yantai, 264005 P. R. China.; University of Chinese Academy of Sciences, Beijing 100049, P. R. China |
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| Abstract: | ![]()
Nonlinear optical (NLO) crystals featuring a strong second-harmonic generation (SHG) response and suitable birefringence to achieve phase-matching are in urgent demand in industrial and commercial applications. Based on the substitution strategy, two new NLO lead-iodide formates, K2[PbI2(HCOO)2] and Rb2[PbI2(HCOO)2], have been successfully synthesized using a moderate mixed-solvothermal method. K2[PbI2(HCOO)2] and Rb2[PbI2(HCOO)2] exhibit strong phase-matching SHG responses of 8 and 6.8 × KDP, respectively, a suitable birefringence and transparent window covering most of the visible light and mid-IR region. Crystal structures and theoretical calculations unveil that the origins of the strong SHG response and suitable birefringence can be credibly attributed to the oriented arrangement of the highly distorted [PbI2O4] hexa-coordinated polyhedra, which are consistent in their local dipole moments, as well. This research provides a new strategy to explore high-performance NLO crystals.K2[PbI2(HCOO)2] and Rb2[PbI2(HCOO)2] with highly distorted [PbI2O4] polyhedra in an oriented arrangement exhibit a very strong phase-matching SHG response, suitable birefringence, wide transparent windows and good thermal stability. |
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