Upconversion luminescence in cellulose composites (fibres and paper) modified with lanthanide-doped SrF₂ nanoparticles

Abstract

The use of functional nanomaterials and their combination with organic polymers leads to the formation of advanced composites and hybrid inorganic-organic systems having unique properties. The use of such materials...

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“…The luminescence capacity is dependent on the crystallinity, purity, and surface conditioning of core‐shell structures of phosphorescent materials, as well as the levels of rare‐earth‐metal ions doped into them [62] . In the case of SrAl 2 O 4 , it was doped with Eu and Dy, and the phosphorescence of SrAl 2 O 4 : Eu 2+ , Dy 3+ occurs through energy transitions between the excited state of Eu 2+ (4f 6 5d 1 ) [63–64] . The Dy 3+ traps the electron of Eu 2+ , converting it to Dy 2+ and releasing thermal energy, leading to recombination of Eu 3+ , and emitting light, Eu 2+ ions returned to the ground state (4f 7 ) [65–66] .…”

“…[62] In the case of SrAl 2 O 4 , it was doped with Eu and Dy, and the phosphorescence of SrAl 2 O 4 : Eu 2 + , Dy 3 + occurs through energy transitions between the excited state of Eu 2 + (4f 6 5d 1 ). [63][64] The Dy 3 + traps the electron of Eu 2 + , converting it to Dy 2 + and releasing thermal energy, leading to recombination of Eu 3 + , and emitting light, Eu 2 + ions returned to the ground state (4f 7 ). [65][66] The luminescence intensity increases with the addition of SrAl 2 O 4 content in the samples.…”

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“…Among them, fluoride based upconversion (UC) nanoparticles show efficient UC luminescence performances because of their favorable properties such as low phonon energy and higher chemical stability, 13 and thus are employed in sensing, bio-detection, anti-counterfeiting, drug delivery, and bioimaging applications. [14][15][16][17][18][19] Many researchers have reported the synthesis and UC luminescence characteristics of Ln 3+ ions in different fluoride hosts including NaYF 4 , [20][21][22][23][24][25][26] NaGdF 4 , [27][28][29][30][31] LiGdF 4 , [32][33][34] KGdF 4 35,36 etc.…”

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“…e common strategy to pick up fluorescent filaments is utilizing the mixes of photoluminescence materials and polymers to turn, for occasion, polyester, polypropylene, regenerated cellulose, and like that [14][15][16][17], yet that is inappropriate to raw natural fiber [14,18]. On the other hand, the complicated and high-cost preparation of several fantastic photoluminescence materials hinders its pragmatic application in textiles.…”