A surface corrosion and expansion mechanism on thermal degradation of SrAl2O4:Eu2+, Dy3+

Peng, Weikang; Xia, Haofu; Zhang, Zhan‐Hui; Qi, Tonggang; Kong, Shijin; Dai, Wubin; Huang, Zhiliang

doi:10.1016/j.jallcom.2018.04.211

Cited by 26 publications

(9 citation statements)

References 12 publications

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“…This is because hydrogen bonding between SAO and PLA promotes thermal movement of PLA macromolecules by PLA itself. This reduces the energy required to break the chain among the macromolecules [18]. DTG data are plotted in Figure 5(b).…”

Section: Resultsmentioning

confidence: 99%

Effect of the Concentration of SrAl2O4: Eu2+and Dy3+ (SAO) on Characteristics and Properties of Environment-Friendly Long-Persistent Luminescence Composites from Polylactic Acid and SAO

Fan

Bai

et al. 2021

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We report luminous polylactic acid (PLA) composite prepared via a solvent casting method using different amounts of phosphor strontium aluminate (SrAl2O4: Eu2+ and Dy3+) (SAO). The reason for doing this is that the changes of fluorescence and mechanical properties in the composites with different SAO contents can be directly evaluated. The SAO particles should have a variety of excellent characteristics in the PLA matrix, among which dispersibility and compatibility are particularly important; so, they can be modified by 3-aminopropyltriethoxysilane (APS) to achieve the target characteristics. The results showed that the fluorescence and mechanical properties were affected by SAO addition. The mechanical properties significantly improved with 5 wt% SAO; further, addition had no impact. And the emission band of fluorescence and phosphorescence is just at the peak of 524 nm. The composites with 15 wt% SAO have the best fluorescence properties. The fluorescence decreased with further doping. Fluorescence decay curves with various amounts of SAO particles show a similar tendency as pure SAO particles; the speed of decrease in afterglow intensity was higher for the first 30 min. In addition, the detailed morphological scanning and study by scanning electron microscope (SEM) showed that the particles had good adhesion to the matrix. In conclusion, the concentration of SAO into the PLA matrix impacts the fluorescence and mechanical properties of a SAO/PLA composite material.

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Section: Resultsmentioning

confidence: 99%

Effect of the Concentration of SrAl2O4: Eu2+and Dy3+ (SAO) on Characteristics and Properties of Environment-Friendly Long-Persistent Luminescence Composites from Polylactic Acid and SAO

Fan

Bai

et al. 2021

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“…The fluorescent powder is firmly bonded to the strontium aluminate core through the formation of an amorphous silica gel layer during the coating process. The XRD peaks at 25.30°, 38.60°, 48.14°, and 54.44° correspond to anatase (101), (112), (200), and (211) crystal planes, respectively . The impurity peaks observed from the modified sample were likely caused by the complex composition of the commercial fluorescent powder used in this experiment.…”

Section: Resultsmentioning

confidence: 94%

Phosphor powders‐incorporated polylactic acid polymeric composite used as 3D printing filaments with green luminescence properties

Wan

Jiang

Nie

et al. 2019

J of Applied Polymer Sci

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A new class of multifunctional nanocomposites holds strong potential in three-dimensional (3D) printing. In this study, SrAl 2 O 4 :Eu 2+ ,Dy 3+ powders with fluorescence property were modified with SiO 2 to improve its dispersibility and compatibility in the polylactic acid (PLA) matrix. The composite filaments with a diameter of 1.75 AE 0.05 mm containing 2 wt % of modified particles were prepared by a melt blending method. The fluorescent analysis reveals that the composite filaments can be excited by light with a broad band of wavelength from 345 to 455 nm with the highest excitation intensity at 426 nm and have a major emission peak at 487 nm. The morphological analysis and mechanical performance testing on the printed samples showed that modified particles were uniformly dispersed within the PLA matrix and improved the mechanical properties of the composite filaments. Moreover, the modified particles improved hydrophobic behavior and antibacterial properties in comparison with unmodified composite. Therefore, the composite material will have potential applications such as making prototypes for customized furniture and accessories by 3D printing technology.

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“…This τ p represents the real lifetime obtained by measuring the afterglow for over 1 h. Under the calcined condition of 1000 °C in air, the afterglow at 200–300 s is too weak to estimate the lifetime of both samples 1 and 2. The afterglow of SAO:Eu,Dy was reportedly decreased with increasing heat-treatment temperature in air because the valency of the Eu ion as a luminescent center was changed from Eu 2+ to Eu 3+ owing to the oxidation Figure shows τ p /τ p 0 at each point of samples 1 and 2 after each calcination.…”

Section: Experimental Results and Discussionmentioning

confidence: 99%

“…The afterglow of SAO:Eu,Dy was reportedly decreased with increasing heat-treatment temperature in air because the valency of the Eu ion as a luminescent center was changed from Eu 2+ to Eu 3+ owing to the oxidation. 26 Figure 7 shows τ p / τ p 0 at each point of samples 1 and 2 after each calcination. Point 0 in Figure 7 indicates the substrate, and τ p at the substrate is defined as τ p 0 (i.e., τ p /τ p 0 = 1).…”

Section: ■ Experimental Section and Data Analysismentioning

confidence: 99%

Phosphorescent Material Search Using a Combination of High-Throughput Evaluation and Machine Learning

et al. 2019

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High-throughput experiments including combinatorial chemistry are useful for generating large amounts of data within a short period of time. Machine learning can be used to predict the regularity of a response variable using a statistical model of a data set. Because a combination of these methods can accelerate the material development, we applied such a combination to a search of semiconducting thin films prepared on an Eu and Dy codoped SrAl2O4-based phosphorescent material to improve the lifetime of its afterglow. Oxide targets MgO, GeO2, Ga2O3, ZnO, Bi2O3, Ta2O5, TiO2, and Y2O3 were deposited to form a thin film on a SrAl2O4 substrate as a combinatorial library with a systematical change in these ratios. The sample was calcined under several conditions, and a data set of 800 examples was obtained using a high-throughput evaluation. The 800 examples were then randomly divided into training and test data sets. The lifetime of the afterglow was interpolated through machine learning using the film thickness of each element and the calcined condition of the training data set as explanatory variables. The accuracy of the interpolation was evaluated using a correlation coefficient and the root mean squared error of the predicted values with respect to the experimental values of the test data set. As a result, it was found that a MgO thin film is effective at improving the lifetime of the afterglow and that its optimum condition is a film thickness of approximately 100 nm with calcination at 400–600 °C in air.

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A surface corrosion and expansion mechanism on thermal degradation of SrAl2O4:Eu2+, Dy3+

Cited by 26 publications

References 12 publications

Effect of the Concentration of SrAl2O4: Eu2+and Dy3+ (SAO) on Characteristics and Properties of Environment-Friendly Long-Persistent Luminescence Composites from Polylactic Acid and SAO

Effect of the Concentration of SrAl2O4: Eu2+and Dy3+ (SAO) on Characteristics and Properties of Environment-Friendly Long-Persistent Luminescence Composites from Polylactic Acid and SAO

Phosphor powders‐incorporated polylactic acid polymeric composite used as 3D printing filaments with green luminescence properties

Phosphorescent Material Search Using a Combination of High-Throughput Evaluation and Machine Learning

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