Defective [Bi2O2 ] 2+ Layers Exhibiting Ultrabroad Near-Infrared Luminescence

Hong Li^+,[a] ,Xiao-Fang Jia^{+ , [b]} ,Qing Zhao^{+ ,[c]} ,Ju-Ping Ma^[a] ,Jian-Dang Liu^[d],,Bang-Jiao Ye^[d],,Yoshihiro Kuroiwa^[c],Chikako Moriyoshi^[c], Zhi-Yong Li^[a],Qi Liu^[a], Jun-Ying Zhang^*[b]（张俊英）,and Hong-Tao Sun^{* [a]}（孙洪涛）

^[a] College of Chemistry, Chemical Engineering and Materials Science Soochow University, Suzhou 215123 (P.R. China)

^[b] Key Laboratory of Micro-nano Measurement, Manipulation and Physics (Ministry of Education), School of Physics Beihang University, Beijing 100191 (P.R. China)

^[c] Department of Physical Science, Hiroshima University Higashihiroshima, Hiroshima 739-8526, (Japan)

^[d] State Key Laboratory of Particle Detection and Electronics Department of Modern Physics University of Science and Technology of China Hefei, Anhui 230026 (P.R. China)

^{[ + ]} These authors contributed equally to this work.

Chem. Eur. J. 2019, 25, 12842 --12848

Aurivillius phases have been routinely known as excellent ferroelectrics and have rarely been deemed as materials that luminesce in the near-infrared (NIR) region. Herein, it is shown that the Aurivillius phases can demonstrate broadband NIR luminescence that covers telecommunication and biological optical windows. Experimental characterization of the model system Bi2.14Sr0.75Ta2O9@x , combined with theoretical calculations, help to establish that the NIR luminescence originates from defective [Bi2O2 ] 2+ layers. Importantly, the generality of this finding is validated based on observations of a rich bank of NIR luminescence characteristics in other Aurivillius phases. This work highlights that incorporating defects into infinitely repeating [Bi2O2 ] 2+ layers can be used as a powerful tool to space-selectively impart unusual luminescence emitters to Aurivillius-phase ferroelectrics, which not only offers an optical probe for the examination of defect states in ferroelectrics, but also provides possibilities for coupling of the ferroelectric property with NIR luminescence.

链接：https://onlinelibrary.wiley.com/doi/pdf/10.1002/chem.201903403