Determination of optical band gap, transmittance, and dielectric constant parameters of Indium Phosphide/Zinc Sulfide quantum dot doped cholesteric liquid crystals
Küçük Resim Yok
Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Nanomaterial doped cholesteric liquid crystal (CLC) composites have become important due to the improvement of their physical properties recently. In this study, the change of Indium Phosphide/Zinc Sulfide (InP/ZnS) quantum dot (QD) concentration in the optical, electro-optical, and dielectric parameters of CLC was examined. Voltage dependent transmittance and response time parameters were determined by the electro-optical switching method. Moreover, wavelength dependent absorbance and transmittance values of samples were investigated Ultraviolet/Visible (UV/VIS) spectroscopy. Dielectric parameters were examined with dielectric spectroscopy. Considering the experimental results, threshold voltage (Vth), response time (tau R), and optical band gap (Eg) values of CLC decreased with InP/ZnS QD contribution. On the other hand, dielectric constants (epsilon ' and epsilon ') and ac conductivity (sigma ac) values increased with InP/ZnS QD contribution at low frequencies. Furthermore, voltage dependent transmittance data indicated that samples were transparent in the absence of voltage (planar -state) due to transmission of light and opaque in the presence of certain voltage (focal conic -state) due to scattering of light. Results show that InP/ZnS QD causes considerable changes in the physical parameters of CLC and the produced samples can be used in the technological devices, especially light shutters.
Açıklama
Anahtar Kelimeler
Cholesteric liquid crystal, Dielectric constant, Optical band gap, Transmittance, Quantum dot, Walled Carbon Nanotubes, Frequency, Behavior, Voltage, Display
Kaynak
Optical Materials
WoS Q Değeri
N/A
Scopus Q Değeri
Q1
Cilt
149
