5 years ago

Abnormal Pressure-Induced Photoluminescence Enhancement and Phase Decomposition in Pyrochlore La2Sn2O7

Abnormal Pressure-Induced Photoluminescence Enhancement and Phase Decomposition in Pyrochlore La2Sn2O7
Xin Wang, Yongsheng Zhao, Cong Xu, Pinwen Zhu, Yan Li, Nana Li, Hongyu Zhu, Wenge Yang
La2Sn2O7 is a transparent conducting oxide (TCO) material and shows a strong near-infrared fluorescent at ambient pressure and room temperature. By in situ high-pressure research, pressure-induced visible photoluminescence (PL) above 2 GPa near 2 eV is observed. The emergence of unusual visible PL behavior is associated with the seriously trigonal lattice distortion of the SnO6 octehedra, under which the Sn–O1–Sn exchange angle θ is decreased below 22.1 GPa, thus enhancing the PL quantum yield leading to Sn 3P1 1S0 photons transition. Besides, bandgap closing followed by bandgap opening and the visible PL appearing at the point of the gap reversal, which is consistent with high-pressure phase decomposition, are discovered. The high-pressure PL results demonstrate a well-defined pressure window (7–17 GPa) with flat maximum PL yielding and sharp edges at both ends, which may provide a great calibration tool for pressure sensors for operation in the deep sea or at extreme conditions. Under ambient conditions, La2Sn2O7 shows a strong near-infrared (NIR) photoluminescence (PL). Starting from 2 GPa, pressure-induced visible PL appears while the bandgap reverses direction (starts increasing after an initial decrease) and reaches a near-flat maximum between 7 and 14 GPa with consumption of NIR PL. The well-defined visible-PL pressure window provides a great calibration tool for pressure sensors under extreme conditions.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201701513

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