Sunlight‐activated long persistent luminescent polyurethane incorporated with amino‐functionalized SrAl₂O₄:Eu²⁺,Dy³⁺ phosphor

Abstract

An amino‐terminated long persistent luminescent phosphor (Amino‐SrAl2O4:Eu2+,Dy3+) was prepared based on inorganic SrAl2O4:Eu2+,Dy3+ phosphor, chemically modified with 3‐aminopropyltriethoxysilane (KH550). Fourier transform infrared and X‐ray photoelectron spectral, thermogravimetric and scanning electron microscopic measurements confirmed the successful synthesis of Amino‐SrAl2O4:Eu2+,Dy3+. Then this amino‐functionalized phosphor was introduced into polyurethane (PU) through urea linkages, and the effects of the chemical combination of Amino‐SrAl2O4:Eu2+,Dy3+ and PU on the morphology, structure, storage stability, and mechanical, thermal and luminescent properties of the resultant long persistent luminescent polyurethane (LPLPU) were investigated. Compared with SrAl2O4:Eu2+,Dy3+/PU composites prepared by physical blending, the LPLPU shows better mechanical properties and storage stability due to the good compatibility of Amino‐SrAl2O4:Eu2+,Dy3+ with PU. More residues and higher initial decomposition temperature are observed because the interaction of the amino‐phosphor and PU delays the degradation. Study of the luminescent effect reveals that the LPLPU shows more than 10 h afterglow after cessation of the excitation light, and the brightness of green light in darkness is basically the same as that of LPLPU and SrAl2O4:Eu2+,Dy3+/PU. © 2016 Society of Chemical Industry

Strontium Aluminate-Based Long Afterglow PP Composites: Phosphorescence, Thermal, and Mechanical Characteristics

“…Additionally, the agglomeration of S 1 and S 2 filler, as shown in the SEM images (Figure 9A-C), adversely impacts the tensile modulus values. and incapability to transfer the applied stress [37]. These observations are in agreement with the decrease in elongation at the yield values for these composites, as shown in Fig- ure 10C.…”

“…In the highest filler loading (10 wt.% S 1 and S 2 ), the TS and TM decreased from 34.5 to 30.5 MPa and 1.1 to 0.94 GPa, respectively. The decrease in the tensile properties of PP/S 1 and PP/S 2 composites by increasing the filler loading can be due to the fact that the presence of inorganic fillers (S 1 and S 2 ) generally influences the elastic properties of PP because of their intrinsic stiffness and incapability to transfer the applied stress [37]. These observations are in agreement with the decrease in elongation at the yield values for these composites, as shown in Figure 10C.…”

“…However, SrAl x O y : Eu 2+ , Dy 3+ phosphors are not exempt from gradual luminescence decay due to their affinity towards moisture. Various encapsulation procedures have been described for gaining stable phosphor, such as Al 2 O 3 [33], SrF 2 coating [34], phosphoric acid [35], organic ligands [36], amino-functionalized [37], among others, have been implied and reported. These processes are complicated, require elaborate equipment, and inversely affect the luminescence output.…”

Sr2MgSi2O7:Eu2+, Dy3+ phosphor‐reinforced wood plastic composites with photoluminescence properties for 3D printing

“…In addition, the introduction of ‐NH 2 groups in KH550‐SMSED resulted in the enhancement of the corresponding absorption peaks around 1640 cm −1 and 3420 cm −1 . [ 23 ] These results indicated that the phosphors had been successfully modified by KH550 through a chemical bonding process instead of only physical absorption. As shown in Figure 3(A),(B), for the phosphors modified with other silane coupling agents, the positions of all peaks were consistent with those of pure SMSED, and only the two corresponding ‐OH characteristic peaks at 3420 cm −1 and 1003 cm −1 were slightly enhanced.…”

The effect of the surface coating of a strontium mono-aluminate europium dysprosium-based (SrAl2O4:Eu2+,Dy3+) phosphor by polyethylene (PE), polystyrene (PS) and their dual system on the photoluminescence properties of the pigment

“…4 To avoid this above-mentioned drawback, the phosphor is encapsulated with several inorganic and/or organic materials. [5][6][7][8][9][10][11][12][13][14][15] The luminous intensity of the coated pigment depends on the dispersion of the pigment (phosphor) in the polymer (paint) matrix. 16 However, because SrAl 2 O 4 :Eu 2+ ,Dy 3+ is a mineral material, it's dispersion in an organic (polymeric) base paint matrix and the fast hydrolysis of this pigment in waterborne environments are major drawbacks.…”