Improvement of optical properties and memory effect in ferroelectric liquid crystal by incorporating core/shell CoFe2O4/ZnO nanocrystals

Here, we report incorporation of spinel ferrite CoFe 2 O 4 /ZnO (ZCOF) core/shell nanocrystals (NCs) in ferroelectric liquid crystals (FLC) resulting better optical properties. The optical properties of FLC were studied using polarizing optical microscopy (POM) and photoluminescence (PL) measurement...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2024-02, Vol.35 (5), p.320, Article 320
Main Authors: Pote, Nilesh, Hinge, Sarika, Ganguly, Prasun, Banpurkar, Arun
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cobalt ferrites
Crystal defects
Display devices
Electric fields
Ferroelectric materials
Ferroelectricity
Liquid crystals
Materials Science
Nanocrystals
Optical and Electronic Materials
Optical memory (data storage)
Optical microscopy
Optical properties
Photoluminescence
Texture
Winding
Zinc oxide
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Summary:Here, we report incorporation of spinel ferrite CoFe 2 O 4 /ZnO (ZCOF) core/shell nanocrystals (NCs) in ferroelectric liquid crystals (FLC) resulting better optical properties. The optical properties of FLC were studied using polarizing optical microscopy (POM) and photoluminescence (PL) measurements. The POM texture analysis reveals improved molecular alignment of FLC by presence of ZCOF NCs. PL emission peak show about 1.4 times improvement of area under curve ratio as a result of enhanced FLC molecular ordering. The improved emission properties of FLC were result of reduced defect state emissions by presence of ZCOF NCs. The optical memory in FLC (20 s) as well as in ZCOF-incorporated FLC (2 min) is also reported using POM texture analysis with aid of ImageJ software. Memory measurements reveal winding and unwinding of helix of FLC by external electric field takes place with discrete steps as a result of smectic subphases emergence. Study of applying staircase potential to FLC material shows critical electric field of helix unwinding is 1 kV/cm. In summary, presence of ZCOF NCs in FLC would give better contrast, better brightness, and optical memory which might be useful for future FLC-based display and electronic devices.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-024-12039-z