Persistent phosphors for luminous paints: A review

Kalyani, N. Thejo; Jain, Abhilasha; Dhoble, S.J.

doi:10.1002/bio.4203

“…Luminous paints are defined as the paints that reveal the property of luminescence. Luminescence could be either in the form of fluorescence or phosphorescence; accordingly, they are classified as fluorescent and phosphorescent paints, respectively [1]. Fluorescent paints glow when they are exposed to short-wave UV radiation, and the color of emission depends on the energy gap of the pigment used [2].…”

Section: Introductionmentioning

confidence: 99%

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

Rajhans,

Kalyani,

Ugale

et al. 2024

JOPR

1

0

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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.

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“…Luminous paints are defined as the paints that reveal the property of luminescence. Luminescence could be either in the form of fluorescence or phosphorescence; accordingly, they are classified as fluorescent and phosphorescent paints, respectively [1]. Fluorescent paints glow when they are exposed to short-wave UV radiation, and the color of emission depends on the energy gap of the pigment used [2].…”

Section: Introductionmentioning

confidence: 99%

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.

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“…Therefore, the research on the best components and processes of the long afterglow energy storage luminescent coating has become a hot topic. The composition of luminescent coating is mainly composed of film-forming material, long afterglow phosphors, fillers and additives [28]. The film-forming material has the ability to adhere to substances and form a film.…”

Section: Introductionmentioning

confidence: 99%

Sunlight-Activated Long Persistent Luminescent Coating for Smart Highways

Li¹,

Yu²,

Tang³

et al. 2023

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With the whole society’s demand for intelligence, the smart highway has become the inevitable trend of road development. Luminescent road marking made of long persistent luminescent coating is a new type of functional marking that is designed with long afterglow luminescent material as the raw material and has many features such as safety, beauty and energy saving. Here, SrA12O4:Eu2+,Dy3+ green long afterglow phosphors were prepared using a high-temperature solid state method. The green phosphors obtained at 1350 °C have two traps with a shallow trap depth of 0.66 eV and a deep trap depth of 0.8 eV. The green afterglow can be seen in the dark for more than 8 h after sunlight excitation for 2 h. The green long persistent luminescent coatings were synthesized using the blending method. The uniformity of each component can be improved by adding 1.25% SiO2 into the luminescent coatings. The addition of 3.5% CaCO3 will improve the compactness of the coatings and reduce water absorption. After soaking in water for 120 h, the afterglow intensity of the coating decreases to 76% of the original, showing good water resistance. After daylight excitation in different weather conditions (cloudy, sunny, rainy), the afterglow can reach more than 5 h; therefore, it can be applied to a smart highway.

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Persistent phosphors for luminous paints: A review

Cited by 16 publications

References 104 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

Sunlight-Activated Long Persistent Luminescent Coating for Smart Highways

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