Electrically modulated photoluminescence in ferroelectric liquid crystal
Prasun Ganguly, T. Joshi, S. Singh, D. Haranath, and A. M. Biradar
TL;DR
This paper demonstrates electrical control of photoluminescence in ferroelectric liquid crystals, showing how voltage-induced helix unwinding modulates PL intensity and wavelength, opening new possibilities for optical device applications.
Contribution
It presents the first demonstration of electrical modulation and switching of photoluminescence in ferroelectric liquid crystals due to helix unwinding.
Findings
PL intensity increases with voltage and shifts wavelength
PL can be switched between high and low states
Helix unwinding causes the observed PL modulation
Abstract
Electrical modulation and switching of photoluminescence (PL) have been demonstrated in pure deformed helix ferroelectric liquid crystal (DHFLC) material. The PL intensity increases and peak position shifts towards lower wavelength above a threshold voltage which continues up to a saturation voltage. This is attributed to the helix unwinding phenomenon in the DHFLC on the application of an electric field. Moreover, the PL intensity could be switched between high intensity (field-on) and low intensity (field-off) positions. These studies would add a new dimension to ferroelectric liquid crystal's application in the area of optical devices.
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