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5 October 2015 Reflective-emissive liquid-crystal displays constructed from AIE luminogens (Presentation Recording)
Ben Zhong Tang, Dongyu Zhao, Anjun Qin
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Proceedings Volume 9565, Liquid Crystals XIX; 95650S (2015) https://doi.org/10.1117/12.2187679
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States
Abstract
The chiral nematic liquid crystal (N*-LC) has plenty of prospective applications in LC display (LCD) owing to the selective reflection and circular dichroism. The molecules in the N*-LC are aligned forming a helically twisted structure and the specific wavelength of incident light is reflected by the periodically varying refractive index in the N*-LC plane without the aid of a polarizer or color filter. However, N*-LC do not emit light which restricts its application in the dark environment. Moreover, the view angle of N*-LC display device was severe limited due to the strong viewing angle dependence of the structure color of the one dimensional photonic crystal of a N*-LC. In order to overcome these weaknesses, we have synthesized a luminescent liquid crystalline compound consisting of a tetraphenylethene (TPE) core, TPE-PPE, as a luminogen with mesogenic moieties. TPE-PPE exhibits both the aggregate-induced emission (AIE) and thermotropic liquid crystalline characteristics. By dissolving a little amount of TPE-PPE into N*-LC host, a circular polarized emission was obtained on the unidirectional orientated LC cell. Utilizing the circular polarized luminescence property of the LC mixture, we fabricated a photoluminescent liquid crystal display (PL-LCD) device which can work under both dark and sunlit conditions. This approach has simplified the device design, lowered the energy consumption and increased brightness and application of the LCD.
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View presentation video on SPIE's Digital Library: http://dx.doi.org/10.1117/12.2187679.4519371786001
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Ben Zhong Tang, Dongyu Zhao, and Anjun Qin "Reflective-emissive liquid-crystal displays constructed from AIE luminogens (Presentation Recording)", Proc. SPIE 9565, Liquid Crystals XIX, 95650S (5 October 2015); https://doi.org/10.1117/12.2187679
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KEYWORDS
Liquid crystals
LCDs
Photonic crystals
Crystals
Liquids
Reflective displays
Reflectivity
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