期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 5, 页码 1592-1595出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b12518
关键词
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资金
- NSFC [21525104, 21571178, 21622101, 51502288, 91622118, 21601188]
- Chinese Academy of Sciences [XDB20000000]
- 863 Program of China [2015AA034203]
- NSF for Distinguished Young Scholars of Fujian Province [2016J06012]
- Youth Innovation Promotion of CAS [2016274]
It is of great difficulty to obtain deep-UV transparent materials with enhanced second harmonic generation (SHG), mainly limited by the theoretically poor transparency of these materials in the deep-UV spectral region. Here we report a new noncentrosymmetric, deep-UV transparent phosphate RbNaMgP2O7, which undergoes a thermo-induced reversible phase transition (at a high temperature of 723 K) and correspondingly an evident SHG enhancement up to similar to 1.5 times. The phase transition is aroused by the twist of [P2O7](4-) dimers with deviation from the P-O-P equilibrium positions. Theoretical analyses reveal that the enhanced SHG can be ascribed to the thermo-induced collective alignment of SHG-active [P2O7](4-) dimers along the polar axis of high-temperature phase. This work provides an unprecedented physical routine (to SHG-enhanced materials) that is distinguished from the traditional one by chemical design and synthesis.
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