Recent advances and future perspectives of photoluminescent liquid crystals and their nanocomposites for emissive displays and other tunable photonic devices

Kumar, Ajay; Singh, Gautam

doi:10.1016/j.molliq.2023.122607

“…It portrayed color-tunable properties when the dopant concentration and temperature were altered. A similar complex, Sm 0.5 Eu 0.5 (TTA) 3 dpphen, disclosed that the rare earth complex was thermally stable at 273.76 °C (melting point = 507.66 °C) with tunable emission from 614 nm to 443 nm, when excited at 385 nm [12]. The spectroscopic properties of Eu(TTA) 3 bipy revealed that complex possessed maximum optical density at neutral pH (pH = 7) [13].…”

Section: Literature Reviewmentioning

confidence: 96%

Exploring the Feasibility of Eu(TTA)<sub>3</sub>TPPO as Pigment for Fluorescent Paint

Rajhans,

Kalyani,

Ugale

et al. 2024

JOPR

1

0

View full text Add to dashboard Cite

We outline the synthesis of rare earth hybrid organic β-diketonate Eu(TTA)3TPPO complex [Eu: Europium, TTA: Thenoyl Trifluoro Acetone, TPPO: Triphenylphosphine oxide] pigment to formulate luminous paints. Epoxy and urea formaldehyde resins were synthesized by catalytic homo polymerization and solution polymerization technique, respectively. The fluorescent pigment was synthesized at ambient temperature by solution technique, maintaining the stoichiometric ratio at pH 7. Nextly, fluorescent paint was developed on glass substrate with epoxy (E) and urea formaldehyde (UF) resins and toluene as solvent with thickness 0.1 mm, respectively. Photoluminescence (PL) spectra and photometric assessment of the complex were carried out to probe its photophysical parameters. The excitation spectra of the synthesized complex depicts a wide-ranging excitation peak at 466 nm with a wide shoulder at 538 nm, while emission spectra discloses an intense peak, recorded at 617 nm which portrays colour in the reddish-orange region of the visible spectrum. The paint compositions were checked for tack-free, hard dry, adhesion, water, salt, alkali and acid spray test to study their resistance against distinct surroundings. The painted panels also portrayed reddish orange emission at a unique wavelength of 617 nm. Amid all the paint compositions, the intensity of the painted panel with urea formaldehyde as a binder was found to be maximum, followed by the painted panel with epoxy as the binder. Photometric evaluation revealed reddish-orange emission from pure pigment as well as painted panels, which portrayed in the visible spectrum. This proposes a way to develop fluorescent paints that find applications in several areas such as flexible displays, glow-in-dark road paints, OLED devices, automotive rare lighting, fluorescent sensors, aircraft cabin and floor lighting, architectural and interior decorations and many more.

show abstract

“…It portrayed color-tunable properties when the dopant concentration and temperature were altered. A similar complex, Sm 0.5 Eu 0.5 (TTA) 3 dpphen, disclosed that the rare earth complex was thermally stable at 273.76 °C (melting point = 507.66 °C) with tunable emission from 614 nm to 443 nm, when excited at 385 nm [12]. The spectroscopic properties of Eu(TTA) 3 bipy revealed that complex possessed maximum optical density at neutral pH (pH = 7) [13].…”

Section: Literature Reviewmentioning

confidence: 96%

Exploring the Feasibility of Eu(TTA)3TPPO as Pigment for Fluorescent Paint

Rajhans,

Kalyani,

Ugale

et al. 2024

JOPR

0

View full text Add to dashboard Cite

We outline the synthesis of rare earth hybrid organic β-diketonate Eu(TTA)3TPPO complex [Eu: Europium, TTA: Thenoyl Trifluoro Acetone, TPPO: Triphenylphosphine oxide] pigment to formulate luminous paints. Epoxy and urea formaldehyde resins were synthesized by catalytic homo polymerization and solution polymerization technique, respectively. The fluorescent pigment was synthesized at ambient temperature by solution technique, maintaining the stoichiometric ratio at pH 7. Nextly, fluorescent paint was developed on glass substrate with epoxy (E) and urea formaldehyde (UF) resins and toluene as solvent with thickness 0.1 mm, respectively. Photoluminescence (PL) spectra and photometric assessment of the complex were carried out to probe its photophysical parameters. The excitation spectra of the synthesized complex depicts a wide-ranging excitation peak at 466 nm with a wide shoulder at 538 nm, while emission spectra discloses an intense peak, recorded at 617 nm which portrays colour in the reddish-orange region of the visible spectrum. The paint compositions were checked for tack-free, hard dry, adhesion, water, salt, alkali and acid spray test to study their resistance against distinct surroundings. The painted panels also portrayed reddish orange emission at a unique wavelength of 617 nm. Amid all the paint compositions, the intensity of the painted panel with urea formaldehyde as a binder was found to be maximum, followed by the painted panel with epoxy as the binder. Photometric evaluation revealed reddish-orange emission from pure pigment as well as painted panels, which portrayed in the visible spectrum. This proposes a way to develop fluorescent paints that find applications in several areas such as flexible displays, glow-in-dark road paints, OLED devices, automotive rare lighting, fluorescent sensors, aircraft cabin and floor lighting, architectural and interior decorations and many more.

show abstract

“…The authors suggested that the constructive interaction between the enhanced electromagnetic field generated near the Au NP surfaces and molecular flurophores present in the DHFLCs could be the probable reason for the enhanced PL intensity [35]. A comprehensive review of studies focusing on PL characteristics of pure LCs, alongside investigations into the enhanced and tunable photoluminescence of nanomaterials (NMs)-LCs nanocomposites is available [36].…”

Section: Introductionmentioning

confidence: 99%

Highly luminescent, fast switching electro-optical device based on core–shell bimetallic nanoparticles/ ferroelectric liquid crystal composites

Abhilash,

Abdul Hakkeem,

Anas

et al. 2024

Nanotechnology

1

0

View full text Add to dashboard Cite

Owing to the passive nature of liquid crystal (LC) materials, achieving luminous displays using pure LC materials is challenging. In addition, it is difficult to achieve a fast switching time using pristine ferroelectric LC devices without compromising their cell thickness. Herein, we have developed a fast switching and highly luminescent electro-optical device by dispersing a minute concentration of bimetallic nanoparticles (Au@Ag NPs) having a spherical gold core and a silver shell within a ferroelectric liquid crystal (FLC) host matrix, ZLI3654. Au@Ag core–shell NPs having synergic attributes of both counterparts were successfully synthesized by a facile seed-mediated route. The Au core helps to tune the shape of the Ag shell and provides enhanced electron density as well as improved stability against oxidation. Introducing nanoparticles induces little structural modifications to the host FLC, resulting in an improvement in the mesogenic alignment. Interestingly, ∼29-fold enhancement in the photoluminescence (PL) intensity is observed on dispersing 0.25 wt% of Au@Ag NPs into the FLC host matrix. The enhanced electromagnetic field in the FLC-nanocomposite is attributed to the Localized Surface Plasmon Resonance of Au@Ag NPs, which strengthens the photon absorption rates by the FLC molecules, culminating in the massive enrichment of the PL intensity. In addition, the improved localized electric field inside the FLC device led to a noticeable enhancement in the spontaneous polarization, dielectric permittivity, and, most interestingly, ∼53% fastening in the switching time at an optimum concentration (0.25 wt%) of Au@Ag NPs. The improved electro-optical parameters of the Au@Ag NPs/FLC composite have been compared with the performance of both pristine Au NPs/FLC and Ag NPs/FLC composites, respectively, for the comprehensiveness of the study. The present study paves a systematic way to develop FLC-based advanced electro-optical devices with faster switching and higher luminescence properties.

show abstract

Recent advances and future perspectives of photoluminescent liquid crystals and their nanocomposites for emissive displays and other tunable photonic devices

Cited by 21 publications

References 71 publications

Exploring the Feasibility of Eu(TTA)<sub>3</sub>TPPO as Pigment for Fluorescent Paint

Exploring the Feasibility of Eu(TTA)<sub>3</sub>TPPO as Pigment for Fluorescent Paint

Exploring the Feasibility of Eu(TTA)3TPPO as Pigment for Fluorescent Paint

Highly luminescent, fast switching electro-optical device based on core–shell bimetallic nanoparticles/ ferroelectric liquid crystal composites

Contact Info

Product

Resources

About