期刊
CHEMISTRY OF MATERIALS
卷 33, 期 15, 页码 6012-6017出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c01399
关键词
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资金
- National Natural Science Foundation of China [51902308, 21921001, 51890862]
- National Key Research and Development Plan of Ministry of Science and Technology [2016YFB0402104]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- Second Young Talent Support Project of Fujian Association of Science and Technology [2020000180]
A series of new langasite crystals were designed and synthesized with excellent mid-IR NLO properties and broad transparency range, achieved by reducing vibration frequency through introducing heavier Ge4+ cations to extend transparency in the mid-IR region. Theoretical calculations also showed significant enhancement of SHG effect by Pb2+ cations.
Mid-infrared (mid-IR) nonlinear optical (NLO) crystals with excellent comprehensive performances are urgently demanded in the laser technology field. Herein, a series of new langasite members, A(3)Te(Zn2Ge)Ge2O14 (A = Sr, Ba, and Pb), were designed and synthesized through a rational chemical substitution strategy with classic A(3)BC(3)D(2)O(14) langasites as ideal prototypes. These crystals exhibited excellent mid-IR NLO properties including a large second harmonic generation (SHG) response (2.7, 3.2, 13.0 X KDP under 1064 nm and 0.11, 0.12, 0.54 X AGS under 2090 nm), a large band gap (4.03, 3.98, and 3.43 eV), and a wide transparency region from the ultraviolet (UV) to mid-IR region. Compared to those langasites with light D-site cations, the titled crystals highlighted the reduction of vibration frequency by the introduction of heavier Ge4+ cations, which helps extend the transparency range in the mid-IR region. Additionally, theoretical calculation results revealed the significant enhancement of the SHG effect by Pb2+ cations on the A-site. This work confirmed the feasibility of our chemical co-substitution strategy and enriched the langasites.
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