Structural, luminescent and thermal properties of blue SrAl2O4:Eu2+, Dy3+ phosphor filled low-density polyethylene composites

Bem, D.B.; Luyt, A. S.; Dejene, F.B.; Botha, J.R.; Swart, H.C.

doi:10.1016/j.physb.2009.09.050

Cited by 13 publications

(12 citation statements)

References 16 publications

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“…X-ray diffraction (XRD) patterns of FTO/cp-TiO 2 and FTO/cp-TiO 2 / SAED thin film substrates show that the SAED film is well crystallized with diffraction peaks at 19.9°, 28.4°, 29.3°, 29.9°, and 35.1° corresponding to (011) (−211), (220), (211), and (031) crystal planes, respectively ( Figure 1c). [28] The SAED film was further characterized by energy dispersion spectrum (EDS) mapping spectrum, high-resolution transmission electronic microscopy (HRTEM) and selected area electron diffraction (Figures S3-S5, Supporting Information), which confirmed the existence of Sr, Al, Eu, and Dy elements and the good crystallinity of the film. The SEM top-view image shows the typical crystal structure of CH 3 NH 3 PbI 3−x Cl x films formed on top of the SAED scaffolds with a maximum grain size of 1.8 µm ( Figure S6, Supporting Information).…”

Section: Resultsmentioning

confidence: 91%

“…AFM measurement indicates that the deposited SAED film exhibits a root mean square of 14.2 nm in Figure b. X‐ray diffraction (XRD) patterns of FTO/cp‐TiO 2 and FTO/cp‐TiO 2 /SAED thin film substrates show that the SAED film is well crystallized with diffraction peaks at 19.9°, 28.4°, 29.3°, 29.9°, and 35.1° corresponding to (011) (−211), (220), (211), and (031) crystal planes, respectively (Figure c) . The SAED film was further characterized by energy dispersion spectrum (EDS) mapping spectrum, high‐resolution transmission electronic microscopy (HRTEM) and selected area electron diffraction (Figures S3–S5, Supporting Information), which confirmed the existence of Sr, Al, Eu, and Dy elements and the good crystallinity of the film.…”

Section: Resultsmentioning

confidence: 99%

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Long‐Lasting Nanophosphors Applied to UV‐Resistant and Energy Storage Perovskite Solar Cells

Chen

Jin

et al. 2017

Advanced Energy Materials

126

118

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Recently, considerable progress is achieved in lab prototype perovskite solar cells (PSCs); however, the stability of outdoor applications of PSCs remains a challenge due to the high sensitivity of perovskite material under moist and ultraviolet (UV) light conditions. In this work, the UV photostability of PSC devices is improved by incorporating a photon downshifting layer—SrAl2O4: Eu2+, Dy3+ (SAED)—prepared using the pulsed laser deposition approach. Light‐induced deep trap states in the photoactive layer are depressed, and UV light‐induced device degradation is inhibited after the SAED modification. Optimized power conversion efficiency (PCE) of 17.8% is obtained through the enhanced light harvesting and reduced carrier recombination provided by SAED. More importantly, a solar energy storage effect due to the long‐persistent luminescence of SAED is obtained after light illumination is turned off. The introduction of downconverting material with long‐persistent luminescence in PSCs not only represents a new strategy to improve PCE and light stability by photoconversion from UV to visible light but also provides a new paradigm for solar energy storage.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Long‐Lasting Nanophosphors Applied to UV‐Resistant and Energy Storage Perovskite Solar Cells

Chen

Jin

et al. 2017

Advanced Energy Materials

126

118

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“…The authors have suggested that this pattern can be due to the filler orientation in the direction of shear force as well as the configuration of the extrusion die. Bem et al investigated the composites of LDPE with different volume ratios of SrAl 2 O 4 :Eu 2+ ,Dy 3+ phosphor. The composite emitted blue phosphorescence in the dark and exhibited luminescence spectra at 485.5 and 415 nm, which corresponds to the 4f–5d transition of Eu 2+ .…”

Section: Photoluminescent Phosphor Compositesmentioning

confidence: 99%

Developments in Eu⁺²‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

et al. 2014

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The discovery of rare earth based phosphors in 1960s started a new era of luminescence. In comparison with sulfide-based phosphors, strontium aluminates received worldwide acceptance because of their chemical stability and good luminescent properties. The SrAl x O y :Eu 2+ ,Dy 3+ phosphors excited by UV or visible light emit phosphorescence in the blue-green region after the excitation source has been removed, and the phosphorescence last for more than 15 h. The major disadvantage of SrAl x O y :Eu 2+ ,Dy 3+ phosphors is that they are prone to hydrolysis and their luminescent properties gradually deteriorate. The dispersion of these phosphors in a waterproof polymer matrix is an alternative method reported for retaining their luminescent properties. The review extensively deals with strontium aluminate based luminescent materials, the mechanism of luminescence, their synthesis techniques, and different mixing procedures to prepare polymer/strontium aluminate composites. Different methods to improve the dispersion of the strontium aluminate in the polymer matrix are also outlined. C

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“…14 In this work, TGA measurements were made to investigate the effect of the combustion-synthesized BaAlx O y :Eu 2þ ,Dy 3þ phosphor nanoparticle fillers on the thermal stability of LDPE. The curves obtained from the measurements are depicted in Figure 9.…”

Section: Thermal Propertiesmentioning

confidence: 99%

“…The motivation in the present work was twofold: (i) polymer-inorganic nanocrystal composites offer an attractive means to combine the merits of organic and inorganic materials into systems with novel properties. Hence, the emergence of polymer-nanoparticle composites as a class of materials for optoelectronic devices such as luminescent devices, 10 thin film transistors, 11 photovoltaic devices, 12 and optical waveguides 13 ; and (ii) though work on polymer-phosphor nanocomposites is quite nascent, previous results so far obtained by this group 14 are quite promising. The results of the polymer-phosphor nanocomposites from the current work are also quite encouraging for practical applications.…”

Section: Introductionmentioning

confidence: 99%

Luminescent properties of long‐lasting BaAl_xO_y:Eu²⁺,Dy³⁺ nanocomposites

Daniel

Swart

Luyt

et al. 2011

J of Applied Polymer Sci

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BaAl x O y :Eu 2þ ,Dy 3þ blue-green phosphor samples were synthesized by a combustion method at the low temperature of 500 C. Phosphor nanocrystallites with high brightness were obtained without significantly changing the crystalline structure of the host. The crystallite sizes determined from the Scherrer equation ranged between 34 and 41 nm. Different volume fractions of the BaAl x O y :Eu 2þ ,Dy 3þ powder were then introduced in LDPE polymer. The resulting composites were similarly analyzed and also thermally characterized by means of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). PL results indicate that the LDPE-phosphor interface, which is considered to have an influence on the composite behavior, did not significantly change the spectral positions of the phosphor materials, whose major emission peaks occurred at about 505 nm. The improved afterglow results for the composites may have been caused by morphological changes due to increased surface area and defects. Thermal results indicate that the BaAl x O y :Eu 2þ ,Dy 3þ particles acted as nucleating centers and enhanced the overall crystallinity in the LDPE nanocomposite while preventing lamellar growth, hence reducing the crystallite sizes in LDPE.

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Structural, luminescent and thermal properties of blue SrAl2O4:Eu2+, Dy3+ phosphor filled low-density polyethylene composites

Cited by 13 publications

References 16 publications

Long‐Lasting Nanophosphors Applied to UV‐Resistant and Energy Storage Perovskite Solar Cells

Long‐Lasting Nanophosphors Applied to UV‐Resistant and Energy Storage Perovskite Solar Cells

Developments in Eu⁺²‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

Luminescent properties of long‐lasting BaAl_xO_y:Eu²⁺,Dy³⁺ nanocomposites

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Structural, luminescent and thermal properties of blue SrAl2O4:Eu2+, Dy3+ phosphor filled low-density polyethylene composites

Cited by 13 publications

References 16 publications

Long‐Lasting Nanophosphors Applied to UV‐Resistant and Energy Storage Perovskite Solar Cells

Long‐Lasting Nanophosphors Applied to UV‐Resistant and Energy Storage Perovskite Solar Cells

Developments in Eu+2‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

Luminescent properties of long‐lasting BaAlxOy:Eu2+,Dy3+ nanocomposites

Contact Info

Product

Resources

About

Developments in Eu⁺²‐Doped Strontium Aluminate and Polymer/Strontium Aluminate Composite

Luminescent properties of long‐lasting BaAl_xO_y:Eu²⁺,Dy³⁺ nanocomposites