Defective [Bi 2 O 2 ] 2+ Layers Exhibiting Ultrabroad Near‐Infrared Luminescence

Autor: Hong-Tao Sun, Zhi-Yong Li, Qi Liu, Hong Li, Bang‐Jiao Ye, Junying Zhang, Xiaofang Jia, Ju-Ping Ma, Jian‐Dang Liu, Chikako Moriyoshi, Yoshihiro Kuroiwa, Qing Zhao
Rok vydání: 2019
Předmět:
Zdroj: Chemistry – A European Journal. 25:12842-12848
ISSN: 1521-3765
0947-6539
DOI: 10.1002/chem.201903403
Popis: 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 Bi2.14 Sr0.75 Ta2 O9-x , combined with theoretical calculations, help to establish that the NIR luminescence originates from defective [Bi2 O2 ]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 [Bi2 O2 ]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.
Databáze: OpenAIRE
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