Research paper
Strain and illumination triggered regulations of up-conversion luminescence in Er-doped Bi0.5Na0.5TiO3single bondBaTiO3/Mica flexible multifunctional thin films

https://doi.org/10.1016/j.jmat.2021.12.002Get rights and content
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Highlights

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    Boosting UCPL intensity and inhibition of concentration quenching by mechanical bending in flexible thin films.

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    Clearing up the mechanism of strain-induced local structural distortion by analysis of charge density differences.

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    Realizing a facile strategy of UCPL regulations by mechanical or photo stimuli in wearable devices.

Abstract

External stimuli induced effective regulations of luminescent material are of significant interest in the development of smart optical devices. Here, by simply doping with Er3+ in the 0.94Bi0.5Na0.5TiO3-0.06BaTiO3 (BNTBT) ferroelectric host, using the bendable mica substrate, and exerting mechanical strain (bending) or light illumination (via photochromic reaction), the all-inorganic, highly-transparent and flexible Er-doped BNTBT/Mica luminescent-ferroelectric thin films were designed and fabricated, displaying strain-induced dramatically elevation of up-conversion photoluminescence (PL) intensity, suppression of PL concentration quenching, outstanding endurance and durability, convenient illumination-mediated PL quenching. And the strain-induced structural changes and local lattice distortions of the thin films were further explored through theoretical calculations and Raman measurement. Our results can supply the guidance of designing other luminescent-ferroelectric materials with controlled PL properties via easy mechanical/photo stimuli for expanding the application of multifunctional wearable memory devices.

Keywords

Luminescent-ferroelectrics
Flexibility
Mechanical strain
Up-conversion photoluminescence
Photochromic

Cited by (0)

Yang Zhou received her Master Degree in Materials Science and Engineering from Fuzhou University in 2021, under the supervision of A/Prof. Xiao Wu. Her research interests mainly include flexible transparent luminescence thin films and transparent ceramics.

Rui Xiong was born in 1993, in Longyan, Fujian, China. He received the M.E. degree from the school of Materials Science and Engineering, Fuzhou University, Fuzhou, China in 2018. He is currently a Ph.D. candidate in the same institution. His research interests are thermoelectric materials and photocatalytic materials.

Xiao Wu is an Associate Professor at College of Materials Science and Engineering in Fuzhou University, China. He obtained BSc and MSc degrees from Soochow University, and then received Ph.D. degree from Department of Applied Physics, Hong Kong Polytechnic University (PolyU), Hong Kong, China. Subsequently, he completed his postdoctoral research at PolyU. His recent research focuses on luminescent-ferroelectric ceramics and thin films, and multifunctional transparent ceramics. He has co-authored more than 60 papers in professional journals.

Chunlin Zhao received his B.S. degree in Materials Physics from Southwest University of Science and Technology in 2014, received his Master degree in Materials Engineering in 2017 and Ph.D. degree in Materials Physics and Chemistry in 2020 from Sichuan University. He is currently working at College of Materials Science and Engineering in Fuzhou University. His main research interest is the electrocaloric materials and the properties optimization of lead-free ferroelectric/piezoelectric ceramics.

Peer review under responsibility of The Chinese Ceramic Society.

1

These two authors contributed equally to this work.

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