Preparation of transparent photoluminescence smart window by integration of rare‐earth aluminate nanoparticles into recycled polyethylene waste

Abstract

Novel photoluminescent nanocomposite sheets were prepared for simple commercial manufacturing of transparent and luminous photochromic smart windows. A simple physical integration of lanthanide-doped strontium aluminium oxide (LdSAO) nanoparticles into recycled polyethylene (PE) waste produced a smart nanocomposite with persistent phosphorescence and photochromic properties. Because the nanoparticle form of LdSAO is important for developing transparent materials, LdSAO nanoparticles were well dispersed in the PE matrix. Both the morphologies and chemical compositions of the LdSAO nanoparticles and LdSAO-containing luminescent PE sheets were investigated. Both LdSAO-free and photoluminescent PE sheets were colourless in normal daylight. However the LdSAO-containing PE luminescent samples only exhibited a brilliant green colour under ultraviolet (UV) light and a greenish-yellow colour in the dark as verified by Commission Internationale de l'éclairage laboratory parameters. Both absorbance and emission bands were monitored at 377 and 436/517 nm, respectively. The LdSAO-containing PE luminescent sheets were compared with the LdSAO-free sample using both photoluminescence spectroscopy and for their mechanical properties and were found to have improved scratch resistance, UV protection, and superhydrophobic activity. Due to the added LdSAO, photoluminescence, decay, and lifetime spectral tests confirmed its photochromic fluorescence and long-lasting phosphorescence characteristics. The PE@LdSAO nanocomposite sheets displayed UV protection, photostability, hydrophobicity, and excellent durability compared with the blank LdSAO-free PE sheet.

An anticounterfeiting strategy based on photochromic nonwoven polyester fabric by plasma‐assisting spray coating with ultraviolet‐responsive silica@strontium aluminate nanoparticles

“…The –a* represents the green color, +a* represents the red color, −b* represents the blue color, and +b* represents the yellow color. [ 32 ] UV light at 365 nm was used to irradiate the samples for 5 min. According to the high reflectance method, colorimetric strength is denoted by the K/S symbol.…”

“…The lanthanide-doped aluminate (SrAl 2 O 4 :Eu 2+ ,Dy 3+ ) was synthesized by the high-temperature solid-state approach. [21,32] An admixture of H 3 BO 3 (20 mmol), strontium carbonate (100 mmol), aluminum oxide (200 mmol), dysprosium oxide (3 mmol), and europium oxide (2 mmol) was dispersed in absolute ethyl alcohol (400 mL) for 60 min, exposed to ultrasonic at 25 kHz for 60 min, dried at 90 C, and milled for 2 h by a planetary ball milling system. The mixture was sintered for 3 h at 1300 C in a reductive environment of carbon.…”

Optical properties of novel luminescent nacre‐like epoxy/graphene nanocomposite coating integrated with lanthanide‐activated aluminate nanoparticles

“…Scratching HB pencils [ 32 ] and Shore D (Otto Wolpert Werke; Germany) [ 33 ] were used to study resistance to scratch and hardness properties of the nacre‐like coatings, respectively. JEOL 1230 (Japan) was utilized to inspect shape and size of PNPs.…”

Preparation of photoluminescent nanocomposite ink for detection and mapping of fingermarks

“…Inorganic pigment nanoparticles with long‐persistent emission, such as SrAl 2 O 4 : Eu 2+ , Dy 3+ , have been intriguing studies due to their major applications in many sectors like light‐emitting diodes (Bite et al, 2018). Lanthanide‐doped strontium aluminates have been especially noteworthy luminous pigments that were extensively exploited for the creation of different photochromic devices (Alhasani et al, 2022). This might be attributed to their rapid responsiveness, high reversibility, high quantum yield, and photostability (Alhasani et al, 2022; Khattab et al, 2021).…”

“…Lanthanide‐doped strontium aluminates have been especially noteworthy luminous pigments that were extensively exploited for the creation of different photochromic devices (Alhasani et al, 2022). This might be attributed to their rapid responsiveness, high reversibility, high quantum yield, and photostability (Alhasani et al, 2022; Khattab et al, 2021). Thus, the development of photoluminescent ink with strontium aluminate has potential applications to identify individuals in places related to criminal examination, where no special tools are needed.…”