Structural phase transition and photoluminescence properties of YF3 and YF3:Eu3+ under high pressure
Literature Information
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
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 → 7F1,2,3,4 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.
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