Emergent Midgap Excitons in Large‐Size Freestanding 2D Strongly Correlated Perovskite Oxide Films (Advanced Optical Materials 10/2021). Issue 10 (19th May 2021)

• Record Type: Journal Article
• Authors: Zhang, Yuguo; Ma, Haijiao Harsan; Gan, Xin; Hui, Yupeng; Zhang, Yueying; Su, Jie; Yang, Ming; Hu, Zhaosheng; Xiao, Juanxiu; Lu, Xiaoli; Zhang, Jincheng; Hao, Yue
• Is Part Of: Advanced optical materials. Volume 9:Issue 10(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-05-19
• Subjects: 2D materials -- excitons -- localization -- perovskites -- strontium titanate; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202170038
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract : Achievement of large‐size (1 × 1 cm 2 ) freestanding strongly correlated perovskite SrTiO3 films is demonstrated by Haijiao Harsan Ma and co‐workers in article number 2100025 . Two emergent photoluminescence peaks are observed at ≈2.4 eV (green) and ≈1.8 eV (red) which are absent in its 3D bulk form or as‐grown films unexfoliated. The green peak originates from self‐trapped excitons localized within TiO6 octahedra and the red peak is related to Ti vacancies. The observation is promising for potential application of 2D perovskite oxide films in high‐performance optoelectronics.