Site-related near-infrared luminescence in MAl12O19 (M=Ca, Sr, Ba):Fe3+ phosphors

Li, Y.J.; Ma, Yongchao; Ye, Shi; Hu, Gangwei; Zhang, Q.Y.

doi:10.1016/j.materresbull.2013.11.008

Cited by 43 publications

(30 citation statements)

References 24 publications

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“…One is centered at 260 nm in the ultraviolet light region, which is ascribed to charge‐transfer state of O 2− →Fe 3+ , and other PLE bands are located in visible region at 405, 509, 563 nm. They are attributed to inter‐transitions of Fe 3+ [ 6 A 1 ( 6 S)→ 4 T 2 ( 4 D)], [ 6 A 1 ( 6 S)→ 4 T 2 ( 4 G)], [ 6 A 1 ( 6 S)→ 4 T 1 ( 4 G)] . The luminescence decay curves (Figure ) of SrAl 12 O 19 : Fe 3+ N‐PLNPs can be fitted by the exponential decay function.…”

Section: Resultsmentioning

confidence: 99%

SrAl₁₂O₁₉: Fe³⁺ @3‐aminopropyl triethoxysilane: Ambient aqueous stable near‐infrared persistent luminescent nanocomposites

et al. 2019

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Near‐infrared (NIR) persistent luminescent nanoparticles (N‐PLNPs) endow a long‐term in vivo imaging with deep tissue penetration and high signal to noise ratio. However, synthesis route and applicable afterglow center for N‐PLNPs are still limited. Here, we report on a new synthesis by employing chemical precipitation as the central pivot, which is simpler and has controllable and reproducible routes than the existing technique. We also introduce Fe3+ ion as a new member to join the group of afterglow emitters. Although its NIR luminescence is ubiquitous, its NIR afterglow is still almost never reported. In this paper, SrAl12O19: Fe3+ N‐PLNPs display a NIR persistent luminescence from 750 to 1000 nm, which is assigned to 4T1(4G)→6A1(6S) transition of Fe3+. Furthermore, a surface‐amination technique is proposed to improve the stability of SrAl12O19: Fe3+ N‐PLNPs in aqueous solution. After encapsulating the N‐PLNPs with 3‐aminopropyl triethoxysilane (APTES), SrAl12O19: Fe3+ @APTES nanocomposites exhibit a hydrophilic stability beyond 20 days in aqueous solution. The results make them valuable in studying the biological functions of biomolecules and monitoring cellular networks in their native contexts.

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Section: Resultsmentioning

confidence: 99%

SrAl₁₂O₁₉: Fe³⁺ @3‐aminopropyl triethoxysilane: Ambient aqueous stable near‐infrared persistent luminescent nanocomposites

et al. 2019

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“…The morphology, texture and elemental distribution were obtained through electron microscopic studies like SEM, TEM and BSE imaging [31,35,54]. Mossbauer [5,29,], XANES [34], FTIR/IR [24,32,58] and Raman spectra [32,46] were utilized for obtaining additional structure information. ESR was used to make the first direct determination of Ti 3+ [33].…”

Section: Techniques Applied For Hibonitesmentioning

confidence: 99%

Colored oxides with hibonite structure: A potential route to non-cobalt blue pigments

Medina

Stalick

et al. 2016

Progress in Solid State Chemistry

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The crystal structure of hibonite with an ideal formula CaAl 12 O 19 is hexagonal P6 3 /mmc, isostructural with magnetoplumbite. Natural and synthetic hibonites have been widely studied for their formation, compositions, crystal structures, properties and applications. Recent increasing interest in its coloration has led to the search of inorganic pigments based on the hibonite structure. We present here the syntheses and characterization of hibonite compounds with a general formula of AAl 12-x M x O 19 (A = Ca, Sr, RE or any combination thereof; and M = Ni or Ni coupled with one of the following: Ti, Sn, Ge, Nb, Ta, Sb). Bright sky-blue to royal-blue colors are induced in these oxides prepared by conventional solid state reactions, as demonstrated in the solid solutions of CaAl 12-2x Ni x Ti x O 19 (x = 0  1) and Ca 1-x La x Al 12-x Ni x O 19 (x = 0  1). The values of color coordinates L*a*b* range from 64.5,-5.3,-18.5 to 57,-11.33,-30.38. Structure refinements of neutron powder diffraction data reveal that Ni preferably occupies the tetrahedral site in the hibonite structure, and magnetic susceptibility analysis confirms that this Ni is Ni 2+. Optical measurements further verify that the observed blue color is due to d-d transitions of tetrahedral Ni 2+. The preference of Ni 2+ for the tetrahedral site is unusual because Ni 2+ prefers the octahedral site in the spinel NiAl 2 O 4. We attribute this unexpected behavior to the unusually large AlO distances for the tetrahedral site in the hibonite structure. These blue hibonites exhibit excellent thermal stability, superior acid/base durability and better near-infrared reflectance than that of the commercial cobalt blue pigment. Our results suggest a potential route to the development of inexpensive, enduring and cobalt-free blue pigments. Synthesis and characterization methods are briefly reviewed for hibonite type of oxides, especially those with blue colors.

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“…In addition to standard solid state synthesis [2,7,8,20,23,24,38,44,49,[51][52]56] other preparation methods were also applied to obtain hibonite-type oxides. Solution combustion synthesis using metal nitrates was performed [25,32,50].…”

Section: Other Preparation Methodsmentioning

confidence: 99%

“…Spectroscopic investigations (absorbance and fluorescence spectra) [4,6,7,34,42,55], nearinfrared (IR) spectra [7,37], emission spectra [9], luminescence [10], color description by L*a*b* parameters [53][54][55] and other optical property characterizations [34,35,41,43,50,51,[53][54][55] were employed. Additional information of the hibonite-based oxides was collected using electron paramagnetic resonance (EPR) [7], Mössbauer technique [4,35,38,40,[42][43], magnetic susceptibility measurements [6,21,56] magnetic structure refinement [19,29,33,47], thermal analysis [33,55], along with measurements of electrical properties [24,25], dielectric properties [56] chemical reactivity [43] and microhardness [43,47].…”

Section: Techniques Applied For Hibonitesmentioning

confidence: 99%

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Colored oxides with hibonite structure II: Structural and optical properties of CaAl12O19-type pigments with chromophores based on Fe, Mn, Cr and Cu

Medina

Subramanian

2017

Progress in Solid State Chemistry

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Colored hibonite-type oxides with a general formula CaAl 12-x M x O 19 were prepared by solid state reactions through M-site substitution of aluminum with various di-, tri-and tetravalent cations (M = Fe, Mn, Cr, Cu, Ga, In, Ti, Ge, Sn or any combination thereof), where Fe, Mn, Cr and Cu are chromophore ions. Neutron Rietveld refinements of CaAl 9.5 Fe 2.5 O 19 , CaAl 11.5 Mn 0.5 O 19 and CaAl 10 SnMnO 19 compounds show that Fe 3+ and Mn 2+ prefer to occupy the tetrahedral site, while Mn 3+ has an evident preference for both tetrahedral and octahedral sites and Sn 4+ for octahedral site in the hibonite structure. No oxygen vacancies are found by structural analyses, and magnetic measurement confirms divalent Mn for CaAl 11 Sn 0.5 Mn 0.5 O 19 and trivalent Mn for CaAl 11.5 Mn 0.5 O 19. Diffuse reflectance spectra reveal that the d-d transitions occurring in transition metal chromophores are mainly responsible for the observed colors. The colored powders exhibit fairly high reflectance in the near-infrared region (7502500 nm) which makes them potential candidates for cool pigment applications. Synthesis and characterization methods are briefly reviewed for hibonite type of oxides, especially those containing Fe, Mn, Cr and Cu.

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Site-related near-infrared luminescence in MAl12O19 (M=Ca, Sr, Ba):Fe3+ phosphors

Cited by 43 publications

References 24 publications

SrAl₁₂O₁₉: Fe³⁺ @3‐aminopropyl triethoxysilane: Ambient aqueous stable near‐infrared persistent luminescent nanocomposites

SrAl₁₂O₁₉: Fe³⁺ @3‐aminopropyl triethoxysilane: Ambient aqueous stable near‐infrared persistent luminescent nanocomposites

Colored oxides with hibonite structure: A potential route to non-cobalt blue pigments

Colored oxides with hibonite structure II: Structural and optical properties of CaAl12O19-type pigments with chromophores based on Fe, Mn, Cr and Cu

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Site-related near-infrared luminescence in MAl12O19 (M=Ca, Sr, Ba):Fe3+ phosphors

Cited by 43 publications

References 24 publications

SrAl12O19: Fe3+ @3‐aminopropyl triethoxysilane: Ambient aqueous stable near‐infrared persistent luminescent nanocomposites

SrAl12O19: Fe3+ @3‐aminopropyl triethoxysilane: Ambient aqueous stable near‐infrared persistent luminescent nanocomposites

Colored oxides with hibonite structure: A potential route to non-cobalt blue pigments

Colored oxides with hibonite structure II: Structural and optical properties of CaAl12O19-type pigments with chromophores based on Fe, Mn, Cr and Cu

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Product

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SrAl₁₂O₁₉: Fe³⁺ @3‐aminopropyl triethoxysilane: Ambient aqueous stable near‐infrared persistent luminescent nanocomposites

SrAl₁₂O₁₉: Fe³⁺ @3‐aminopropyl triethoxysilane: Ambient aqueous stable near‐infrared persistent luminescent nanocomposites