Structural, photoluminescence and Judd-Ofelt analysis of red-emitting Eu3+ doped strontium hexa-aluminate nanophosphors for lighting application

Smart windows with long-persistent phosphorescence, ultraviolet (UV) light protection, high transparency, and high rigidity were developed by easily immobilizing varying ratios of lanthanide-activated aluminate phosphor nanoscale particles within a composite of recycled polyester/cellulose nanocrystals (RPET/CNC). Cellulose nanocrystals were prepared from rice straw waste. Cellulose nanocrystals were used at low concentration as both crosslinker and drier to improve both transparency and hardness. The phosphor nanoscale particles must be distributed into the recycled polyester/cellulose nanocrystals composite bulk without agglomeration to produce transparent RPET/CNC substrates. Photoluminescence characteristics were also studied using spectroscopic profiles of excitation/emission and decay/lifetime. The hardness efficiency was also examined. This transparent recycled polyester waste/ cellulose nanocrystals nanocomposite smart window has been shown to change colour under UV light to strong green and to greenish-yellow when it is dark, as proved by Commission Internationale de l'éclairage (CIE) laboratory colour parameters. It was found that the afterglow RPET/CNC smart window had phosphorescence intensities of 428, 493, and 523 nm upon excitation at 368 nm. There was evidence of improved UV shielding, photostability, and hydrophobic activity. In the presence of a low phosphor ratio, the luminescent RPET/CNC substrates showed quick and reversible fluorescence photochromic activity when exposed to UV radiation.

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“…Therefore, rare earth‐doped aluminates have gained popularity in a broad variety of smart goods. [ 28–31 ]…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, rare earth-doped aluminates have gained popularity in a broad variety of smart goods. [28][29][30][31] Smart windows are materials that can change their light transmission according on the amount of light, voltage, or heat to which they are exposed. However, they are often constructed from brittle and pricey glasses.…”

mentioning

confidence: 99%

Photoluminescent and photochromic smart window from recycled polyester reinforced with cellulose nanocrystals

et al. 2022

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“…A variety of applications have benefited from this phenomenon, including protective garments, aesthetic decorations, anticounterfeiting barcodes, and safety signs. An external light source could be readily used to store light energy inside these long-lasting photoluminescent materials, which are made up of a carrier and a luminescent dye/pigment. − When the light source is removed, the photoluminescent pigment can gently discharge light. Strontium aluminum oxide (SAO) crystals and divalent europium energy traps are key components of the long-lasting phosphorescence process.…”

Section: Introductionmentioning

confidence: 99%

Simple Preparation of Photoluminescent and Color-Tunable Polyester Resin Blended with Alkaline-Earth-Activated Aluminate Nanoparticles

et al. 2022

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A simple inorganic/organic nanocomposite was used to generate long-lasting phosphorescent pebbles for easy commercial manufacturing of smart products. An organic/inorganic nanocomposite was made from low-molecular-weight unsaturated polyester and rare-earth-activated strontium aluminum oxide nanoparticles doped with europium and dysprosium. The polyester resin was mixed with phosphorescent strontium aluminate oxide nanoparticles and methylethyl ketone peroxide as a cross-linking agent to create a viscous mixture that can be hardened in a few minutes at room temperature. Before adding the hardener catalyst, the phosphorescent strontium aluminate nanoparticles were dispersed throughout the polyester resin in a homogeneous manner to ensure that the pigment did not accumulate. Long-lasting, reversible luminescence was shown by the photoluminescent substrates. The emission was reported at 515 nm upon exciting the pebble at 365 nm. In normal visible light, both blank and luminescent pebbles had a translucent appearance. As a result of UV irradiation, the photoluminescent pebbles produced an intense green color. The three-dimensional CIE Lab (International Commission on Illumination) color coordinates and luminescence spectra were used to investigate the color changing characteristics. Photophysical characteristics, including excitation, emission, and lifetime, were also investigated. Scanning electron microscopy, wavelength-dispersive X-ray fluorescence spectroscopy, and energy-dispersive X-ray analysis were employed to report the surface morphologies and elemental content. Without impairing the pebbles’ original physico-mechanical characteristics, the pebbles showed improved superhydrophobic activity. The current simple colorless long-lasting phosphorescent nanocomposite can be applied to a variety of surfaces, like ceramics, glassware, tiles, and metals.

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“…Europium was chosen as a doping ion due to its rich luminescence spectrum and high intensity emission. Nowadays, Eu 3+ -doped materials are widely used in solid-state lighting, 45 display devices, 46 white-LEDs, 47 anti-counterfeiting devices, 48 biological labelling, 49 theranostics, 50 and optical thermometry. 51 Herein, we report a study on Eu 3+ -doped LaVO 4 phosphor for use in multimode luminescence thermometry within a wide temperature range of 98-723 K. A set of steady-state luminescence features, namely the luminescence intensity ratio (LIR), the spectral line position, and the bandwidth, were chosen as the temperature-sensitive parameters.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-doped LaVO₄:Eu³⁺ phosphor for multimode optical thermal sensing

Kolesnikov

Mamonova

Kurochkin

et al. 2022

Phys. Chem. Chem. Phys.

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Structural, photoluminescence and Judd-Ofelt analysis of red-emitting Eu3+ doped strontium hexa-aluminate nanophosphors for lighting application

Cited by 39 publications

References 59 publications

Photoluminescent and photochromic smart window from recycled polyester reinforced with cellulose nanocrystals

Photoluminescent and photochromic smart window from recycled polyester reinforced with cellulose nanocrystals

Simple Preparation of Photoluminescent and Color-Tunable Polyester Resin Blended with Alkaline-Earth-Activated Aluminate Nanoparticles

Low-doped LaVO₄:Eu³⁺ phosphor for multimode optical thermal sensing

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Structural, photoluminescence and Judd-Ofelt analysis of red-emitting Eu3+ doped strontium hexa-aluminate nanophosphors for lighting application

Cited by 39 publications

References 59 publications

Photoluminescent and photochromic smart window from recycled polyester reinforced with cellulose nanocrystals

Photoluminescent and photochromic smart window from recycled polyester reinforced with cellulose nanocrystals

Simple Preparation of Photoluminescent and Color-Tunable Polyester Resin Blended with Alkaline-Earth-Activated Aluminate Nanoparticles

Low-doped LaVO4:Eu3+ phosphor for multimode optical thermal sensing

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Low-doped LaVO₄:Eu³⁺ phosphor for multimode optical thermal sensing