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Emergent Midgap Excitons in Large‐Size Freestanding 2D Strongly Correlated Perovskite Oxide Films (Advanced Optical Materials 10/2021)
Author(s) -
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
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202170038
Subject(s) - materials science , perovskite (structure) , photoluminescence , exciton , octahedron , oxide , optoelectronics , nanotechnology , condensed matter physics , crystallography , crystal structure , physics , metallurgy , chemistry
Achievement of large‐size (1 × 1 cm 2 ) freestanding strongly correlated perovskite SrTiO 3 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 TiO 6 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.