Deep-Ultraviolet Transparent Cs2LiPO4 Exhibits an Unprecedented Second Harmonic Generation
Deep-Ultraviolet Transparent Cs2LiPO4 Exhibits an Unprecedented Second Harmonic Generation
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深紫外透明 Cs2LiPO4 表现出前所未有的二次谐波产生
DOI：
10.1021/acs.chemmater.6b03333
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发表时间：
2016
影响因子：
8.6
通讯作者：
Luo Junhua
中科院分区：
文献类型：
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作者：
Shen Yaoguo;Yang Yi;Zhao Sangen;Zhao Bingqing;Lin Zheshuai;Ji Chengmin;Li Lina;Fu Ping;Hong Maochun;Luo Junhua
由于深紫外透明和增强二次谐波产生之间的矛盾，开发上级深紫外非线性光学（NLO）材料是一个巨大的挑战，特别是对于P-O基团微观二次谐波系数相对较小的深紫外非线性光学磷酸盐。本文报道了一种新的非中心对称磷酸盐Cs2 LiPO 4（I），其晶体结构由[LiPO 4]∞层状结构单元组成，具有新颖的蜂窝状拓扑结构。与基准深紫外非线性光学材料KBe 2BO 3F 2相比，I不含铍，并且由于其一致熔融，因此相对容易生长其大单晶。此外，它不仅是深紫外透明的，而且还表现出意想不到的1.8 × KH 2 PO 4的增强SHG响应，创下了深紫外NLO磷酸盐的新高。这些结果表明，我满足作为一个有前途的深紫外非线性光学候选人的关键要求。理论计算和结构分析表明，该结构具有良好的力学性能。
Developing superior deep-ultraviolet (deep-UV) nonlinear optical (NLO) materials is a great challenge because of the contradiction between deep-UV transparency and enhanced second harmonic generation (SHG), especially for deep-UV NLO phosphates in which the constituent P–O groups have relatively small microscopic SHG coefficients. Here we report a new noncentrosymmetric phosphate Cs2LiPO4 (I), whose crystal structure consists of [LiPO4]∞ layered structural units with a novel honeycomb-like topology. As compared with the benchmark deep-UV NLO material KBe2BO3F2, I is beryllium-free, and it is relatively easy to grow its large single crystals because of its congruent melting. Furthermore, it not only is deep-UV transparent but also exhibits an unexpectedly enhanced SHG response of 1.8 × KH2PO4 that hits a new high in deep-UV NLO phosphates. These results demonstrate that I satisfies the key requirements of being a promising deep-UV NLO candidate. Theory calculations and structural analysis reveal that the e...