Enhancement in electro-optical properties of ferroelectric liquid crystal by doping perovskite CsPbBr₃ quantum dots

ABSTRACT

We demonstrate enhancement in electro-optical properties of ferroelectric liquid crystal (FLC) material on incorporation of perovskite CsPbBr₃ quantum dots (QDs). The underlying mechanism for enhancement in optical contrast, optical tilt angle, photoluminescence intensity and reduced saturation voltage of an FLC mixture is a consequence of incorporation of CsPbBr₃ QDs. The amount of CsPbBr₃ QDs in FLC material was varied as well. The experimental findings were attributed to the modification in the local ordering and orientation of the FLC molecules influenced by the presence of the QDs. Stable and improved electro-optical properties of FLC composite, by choosing an optimised concentration of the QDs in FLC is the primary finding of the present efforts. The results presented here are useful in the manufacturing of improved LC display devices based on QDs having larger viewing angles, improved contrast and lower operating voltage.

Graphical abstract

KEYWORDS:

• Chiral smectic C phase
• perovskite quantum dots
• tilt angle
• molecular ordering
• photoluminescence

Acknowledgements

S.D. acknowledges University Grants Commission (UGC), India (Grant reference number: UPE 262 (A) 3) and A.S. thanks Women Scientist Program, Department of Science and Technology (WOS-A, DST), India (Grant reference number: SR/WOS-A/PM-60/2017) for the financial support. The authors are thankful to UGC-DAE, Consortium for Scientific Research, Indore, for ferroelectric measurements. Dr. A. M. Biradar from CSIR-National Physical Laboratory (CSIR-NPL), New Delhi, India, is kindly acknowledged for helpful discussion and experiments regarding dielectric measurements. Authors are also thankful to Dr. V. L. Mathe from Department of Physics, S. P. Pune University, India for generous help regarding thickness measurement of LC sample cells using dielectric measurements. The authors would also like to acknowledge Department of Physics, S. P. Pune University, India for other characterization techniques.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

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Additional information

Funding

This work was supported by the Department of Science and Technology, Ministry of Science and Technology [SR/WOS-A/PM-60/2017];University Grants Commission [UPE 262 (A) 3].