Abnormal Pressure-Induced Photoluminescence Enhancement and Phase Decomposition in Pyrochlore La<sub>2</sub> Sn<sub>2</sub> O<sub>7</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 28691391.
- Also identified by DOI 10.1002/adma.201701513.
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Abstract
La<sub>2</sub> Sn<sub>2</sub> O<sub>7</sub> 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 SnO<sub>6</sub> 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 <sup>3</sup> P<sub>1</sub> → <sup>1</sup> S<sub>0</sub> 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.