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Extremely High Kerr Constant and Low Operating Voltage in a Stable Room-Temperature Blue Phase III Derived from
Raj Kumar Khan1,2, Golam Mohiuddin3, Nazma Begum4
1Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata 700 009, India.
ACS Applied Materials & Interfaces
|September 9, 2022
Summary
New bent-core liquid crystals stabilize blue phase III (BPIII) at room temperature, enabling low-voltage electro-optical switching. This breakthrough offers record-high Kerr constant values for BPIII materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Organic Electronics
Background:
- Blue Phase III (BPIII) liquid crystals exhibit unique electro-optical properties.
- Stabilizing BPIII over a wide temperature range, especially at room temperature, is crucial for device applications.
- Existing BPIII materials often require high operating voltages and lack stability.
Purpose of the Study:
- To develop a new series of highly polar three-ring-based bent-core liquid crystals (BCLCs).
- To stabilize Blue Phase III (BPIII) over a broad temperature range, including room temperature.
- To investigate the electro-optical switching properties and performance metrics of the stabilized BPIII system.
Main Methods:
- Synthesis and characterization of novel three-ring-based bent-core liquid crystals (BCLCs).
- Stabilization of Blue Phase III (BPIII) using the developed BCLCs.
- Measurement of electro-optical (E-O) switching characteristics, including Kerr constant (K) and operating voltage (Von).
- Analysis of response times and rotational viscosity.
Main Results:
- Successful stabilization of BPIII across a wide temperature range, including room temperature.
- Demonstration of room-temperature electro-optical switching in the BPIII system.
- Observation of an exceptionally high Kerr constant (K ≈ 9.2 × 10^-9 m V^-2), surpassing previous BPIII materials.
- Achieved the lowest reported operating voltage (Von ≈ 3.3 Vrms/μm) for BPIII.
- Millisecond-order response times were observed and attributed to rotational viscosity.
Conclusions:
- The novel BCLCs effectively stabilize BPIII over a wide temperature range, enabling room-temperature applications.
- The achieved high Kerr constant and low operating voltage set new benchmarks for BPIII materials.
- The millisecond response times are suitable for various device applications.
- The developed binary BPIII system presents a promising candidate for practical device implementation.
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