Electro-optical properties of low viscosity driven holographic polymer dispersed liquid crystals

Moon, Kyung‐Ji; Bae, S. Y.; Kim, B.K.

doi:10.1016/j.optmat.2015.01.003

Cited by 5 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nevertheless, when the RB concentration continues to rise, a significant decrease of the switching voltage is observed, affording 9.1 ± 1.3 and 16.5 ± 1.2 V μm –1 of the threshold and saturated voltages, respectively, when the RB content reaches 9.41 × 10 –3 mol L –1 . These values are slightly larger than those reported previously using the RB/NPG initiating system ,, but can be further optimized, for instance, by introducing conductive or semiconductive nanomaterials. , …”

Section: Results and Discussionmentioning

confidence: 59%

Photoinitiation and Inhibition under Monochromatic Green Light for Storage of Colored 3D Images in Holographic Polymer-Dispersed Liquid Crystals

Chen¹,

Ni²,

Peng³

et al. 2017

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Holographic photopolymer composites have garnered a great deal of interest in recent decades, not only because of their advantageous light sensitivity but also due to their attractive capabilities of realizing high capacity three-dimensional (3D) data storage that is long-term stable within two-dimensional (2D) thin films. For achieving high performance holographic photopolymer composites, it is of critical importance to implement precisely spatiotemporal control over the photopolymerization kinetics and gelation during holographic recording. Though a monochromatic blue light photoinitibitor has been demonstrated to be useful for improving the holographic performance, it is impractical to be employed for constructing holograms under green light due to the severe restriction of the First Law of Photochemistry, while holography under green light is highly desirable considering the relatively low cost of laser source and high tolerance to ambient vibration for image reconstruction. Herein, we disclose the concurrent photoinitiation and inhibition functions of the rose bengal (RB)/N-phenylglycine (NPG) system upon green light illumination, which result in significant enhancement of the diffraction efficiency of holographic polymer-dispersed liquid crystal (HPDLC) gratings from zero up to 87.6 ± 1.3%, with an augmentation of the RB concentration from 0.06 × 10 to 9.41 × 10 mol L. Interestingly, no detectable variation of the ϕk/k, which reflects the initiation efficiency and kinetic constants, is given when increasing the RB concentration. The radical inhibition by RBH is believed to account for the greatly improved phase separation and enhanced diffraction efficiency, through shortening the weight-average polymer chain length and subsequently delaying the photopolymerization gelation. The reconstructed colored 3D images that are easily identifiable to the naked eye under white light demonstrate great potential to be applied for advanced anticounterfeiting.

show abstract

Section: Results and Discussionmentioning

confidence: 59%

Photoinitiation and Inhibition under Monochromatic Green Light for Storage of Colored 3D Images in Holographic Polymer-Dispersed Liquid Crystals

Chen¹,

Ni²,

Peng³

et al. 2017

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…K. Moon y colaboradores incorporan dos tipos de isocianurato de trialilo (TI) con diferentes estructuras en la red de transmisión convencional de HPDLC. Reportan que la viscosidad de la premezcla disminuye en un 13-18% con hasta un 3% de TI (Moon et al, 2015).…”

Section: Introductionunclassified

Caracterización de un holograma mediante el dopaje de un PDLC con violeta de genciana

Gutiérrez

Cortés

Torres

et al. 2021

View full text Add to dashboard Cite

Se propone la utilización de un dispositivo PDLC (Polymer Dispersed Liquid-Crystal) dopado con violeta de genciana para su utilización en el grabado de rejillas holográficas (H-PDLC). Se muestra el comportamiento de la eficiencia de difracción de rejillas holográficas grabadas en un H-PDLC con un espesor de 10 µm. El proceso de grabado se lleva a cabo por la modulación del índice de refracción del H-PDLC al ser expuesto a un patrón de luz. La eficiencia máxima que alcanza este dispositivo es del 5% medido en el orden 1 de difracción. Este dispositivo promete ser un buen material para funcionar como alternativa de las películas holográficas.

show abstract

“…Mesh size of the polymer network in PDLC films was considered as the direct factor for optimizing the threshold voltage and saturation voltage of the PDLC [13][14][15]. The threshold voltage, saturation voltage and the rise time of the PDLC would be decreased, as the mesh size of the polymer network increasing.…”

Section: Introductionmentioning

confidence: 99%

The Relationship between the Monomer Chain Length and the Electro-Optical Properties of Polymer Dispersed Liquid Crystals

Liu¹,

Ozga²,

Liu³

et al. 2016

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

Five polymers dispersed liquid crystalline (LC) films were fabricated using photo-polymerizable monomers with different lengths of carbon chains. These LC films have shown different electro-optical (EO) properties. Through their SEM pictures, the relationship between the linear electro-optical effect and the mesh size of the polymer network was explored. With the increase of number of photo-polymerizable monomers, the mesh size of the polymer network would become larger. So the liquid crystal molecules would be easily oriented in the electric field and therefore, the threshold voltage and saturation voltage would decrease. The open state response times were also reduced and the off state response times would be extended. The DFT simulations have shown principal role of the ground state dipole moments in the observed electro-optical efficiency.

show abstract

Electro-optical properties of low viscosity driven holographic polymer dispersed liquid crystals

Cited by 5 publications

References 25 publications

Photoinitiation and Inhibition under Monochromatic Green Light for Storage of Colored 3D Images in Holographic Polymer-Dispersed Liquid Crystals

Photoinitiation and Inhibition under Monochromatic Green Light for Storage of Colored 3D Images in Holographic Polymer-Dispersed Liquid Crystals

Caracterización de un holograma mediante el dopaje de un PDLC con violeta de genciana

The Relationship between the Monomer Chain Length and the Electro-Optical Properties of Polymer Dispersed Liquid Crystals

Contact Info

Product

Resources

About