Structural phase transition and photoluminescence properties of YF3 and YF3:Eu3+ under high pressure

Chen Gong; Quanjun Li; Ran Liu; Yuan Hou; Jinxian Wang; Xiangting Dong; Bo Liu; Xue Yang; Zhen Yao; Xiao Tan; Dongmei Li; Jing Liu; Zhiqiang Chen; Bo Zou; Tian Cui; Bingbing Liu

doi:10.1039/C3CP53230E

Structural phase transition and photoluminescence properties of YF₃ and YF₃:Eu³⁺ under high pressure†

Chen Gong,^a Quanjun Li,^a Ran Liu,^a Yuan Hou,^b Jinxian Wang,^b Xiangting Dong,^b Bo Liu,^a Xue Yang,^a Zhen Yao,^a Xiao Tan,^a Dongmei Li,^a Jing Liu,^c Zhiqiang Chen,^d Bo Zou,^a Tian Cui^a and Bingbing Liu*^a

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* Corresponding authors

^a State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P. R. China
E-mail: liubb@jlu.edu.cn

^b Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, P. R. China

^c Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China

^d GeoScience Department, Stony Brook University, Stony Brook, New York 11794, USA

Abstract

We investigate high-pressure induced phase transitions of YF₃ and Eu-doped YF₃ (YF₃:Eu³⁺) by using the angular dispersive synchrotron X-ray diffraction technique at room temperature. It is found that the starting orthorhombic phase transforms into a new high-pressure phase which is identified as hexagonal structure in both YF₃ and YF₃:Eu³⁺. The high-pressure structure of YF₃ and YF₃:Eu³⁺ returned to the orthorhombic phase after release of pressure. The photoluminescence properties of YF₃:Eu³⁺ have also been studied under high pressure up to 25 GPa. The Eu³⁺ ion luminescence lines of ⁵D₀ → ⁷F_1,2,3,4 transition originating from the orthorhombic phase transform into another group of luminescence lines of hexagonal phase under high pressure, which reveals the pressure-induced structural transition of YF₃:Eu³⁺. The relative luminescence intensity ratio of ⁵D₀ → ⁷F₂ to ⁵D₀ → ⁷F₁ transitions of the Eu³⁺ ions is found to increase with increasing pressure before phase transition and decrease after transition finished, indicating reducing and enhancing of the symmetry around the Eu³⁺ ions, respectively.

Physical Chemistry Chemical Physics

Structural phase transition and photoluminescence properties of YF₃ and YF₃:Eu³⁺ under high pressure†

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Structural phase transition and photoluminescence properties of YF₃ and YF₃:Eu³⁺ under high pressure

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Physical Chemistry Chemical Physics