Development of zeolite-derived novel aluminosilicate phosphors

Aoyama, Masahiro; Hayakawa, Tomokatsu; Honda, Sawao; Iwamoto, Yuji

doi:10.1016/j.jlumin.2012.05.014

Cited by 7 publications

(6 citation statements)

References 16 publications

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“…10. Both of the two samples exhibit a single band peak centered at 6988 eV assigned to Eu 3+ [33], and thus the oxidation state of the Eu ions in the Sr0.92In1.75O4:0.33Eu 3+ synthesized in this study was determined as trivalent.…”

Section: Optimization Of Pl Red Emission Intensitymentioning

confidence: 84%

Relationship between Eu3+ substitution sites and photoluminescence properties of SrIn2O4:Eu3+ spinel phosphors

Kang

Thuy

Shimokawa

et al. 2016

Journal of Luminescence

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Eu 3+-doped SrIn2O4 phosphors were synthesized by the solid solution method at 1400 ºC in air. The chemical composition of the phosphors was systematically changed to study the relation between the Eu 3+ substitution site and photoluminescence (PL) properties. Under excitation of the 7 F0→ 5 L6 transition of Eu 3+ at 393 nm, the SrIn2O4:Eu 3+ exhibited dominant red emission peaks at 611, 616 and 623 nm, which are attributed to the electric dipole transition 5 D0→ 7 F2 of Eu 3+. The results of X-ray diffraction analysis combined with PL spectroscopic analysis revealed that Eu 3+ ions occupied two different crystallographic In 3+ sites in the host SrIn2O4, while it was found to be impossible to substitute Sr 2+ with Eu 3+ prior to the Eu 3+ substitution at the In 3+ sites in the SrIn2O4. The intensity of the red emission peaks increased with the total amount of dopant Eu 3+ ion at the two In 3+ sites, and reached a maximum at 25 mol% Eu 3+-doping (SrIn2-xO4:xEu 3+ , x=0.25). Moreover, a small amount (<10 mol%) of Eu 3+ at the Sr 2+ site in the SrIn2-xO4:xEu 3+ was found to contribute to enhance the red emission peak intensity at 616 nm. As a result, the highest red emission intensity evaluated as the total emission peak intensities at the 611, 616 and 623 nm was achieved for Sr0.92In1.75O4:0.33Eu 3+ in which Eu 3+ ion concentrations at the In 3+ and Sr 2+ sites were simultaneously optimized as 25 and 8 mol%, respectively (Sr1-yIn2-xO4:(x+y)Eu 3+ , x=0.25, y=0.08). This red emission intensity was 2.2 times higher than that of the phosphor without contribution of the Eu 3+ at the Sr 2+ site (SrIn2-xO4:xEu 3+ , x=0.25). The critical energy transfer distance of Eu 3+ ion in the Sr0.92In1.75O4:0.33Eu 3+ phosphor was determined to be 0.817 nm, and the electric multipolar interaction was suggested as the dominant mechanism for concentration quenching of PL emission due to Eu 3+ ions in the Eu 3+-doped SrIn2O4 phosphors investigated in this study.

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Section: Optimization Of Pl Red Emission Intensitymentioning

confidence: 84%

Relationship between Eu3+ substitution sites and photoluminescence properties of SrIn2O4:Eu3+ spinel phosphors

Kang

Thuy

Shimokawa

et al. 2016

Journal of Luminescence

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“…The nepheline polymorph is similar to a tridymite with ABAB stacking of (Al, SiO 4 ) sheets where the Al:Si (1:1) occupies the tetrahedral sites forming AlO 4 and SiO 4 and their electrostatic charge is balanced by the Na + ions. 21,25,27 Each AlO 4 and SiO 4 tetrahedra is connected with each other via bridging oxygen to form a three-dimensional structure. The crystal structure of the nepheline NAS is reported elsewhere.…”

Section: Resultsmentioning

confidence: 99%

“…In the past, NaAlSiO 4 (NAS) has been investigated mostly for the white light emitting diodes (LEDs) application. [21][22][23][24][25][26][27] Aoyama et al 27 prepared the Eu 3+ doped aluminosilicates phosphors using zeolite A (2.5SiO 2 Al 2 O 3 Na 2 O) as starting material. The XRD patterns showed the formation of low-carnegieite at 1400 and 1500 °C, while the crystal structure was changed from low-carnegieite to nepheline (Na 7.15 Al 7.2 Si 8.8 O 32 ) structure for the phosphors heat treated twice at 1400 and 1100 °C.…”

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confidence: 99%

Effect of Synthesis Temperature on the Structure and Luminescence Properties of the NaAlSiO₄:Er³⁺ Phosphors

Huo

et al. 2021

ECS J. Solid State Sci. Technol.

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We report the synthesis and the effect of synthesis temperature on the crystal structure and dual mode (DC/UC) luminescence properties of the NASE-1000–1300. Two different polymorphs, i.e., nepheline and carnegieite of the NASE have been prepared just by changing the annealing temperature. Multi wavelength excitation can be used to obtain different emissions in visible and NIR regions. Under 380 and 980 nm excitation, the NASE-1000–1300 produces 1535 nm NIR emission, whereas green and red visible emissions are observed with 980 and 808 nm laser excitations. Under 980 nm laser excitation, the synthesis temperature dependent nepheline and carnegieite polymorphs emit intense red and green emission, respectively. Two-photon process is responsible for the green and red UC emissions of the NASE-1300. The NASE-1000-1300 produces intense red emission under 808 nm laser excitation. We believe that the NASE-1000–1300 could be a promising candidate for the photonic as well as biological applications.

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“…Long-term stability has been difficult to achieve in these displays because the photoluminescent materials used are often sensitive to their chemical environments. Encapsulating these materials within zeolites may allow these difficulties to be overcome. − Recent work has focused on ways to accomplish this encapsulation to provide zeolite phosphors with long-term stability and enhanced or modified photoluminescence. − …”

Section: Introductionmentioning

confidence: 99%

Encapsulating Photoluminescent Materials in Zeolites. II. Crystal Structure of Fully Dehydrated Ce₂₁H₄₆O₁₈–Y (Si/Al = 1.69) Containing Ce₄O₄⁴⁺, CeOH²⁺, Ce³⁺, and H⁺

et al. 2015

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Encapsulating photoluminescent centers within zeolites may give them long-term stability and enhanced luminosity. A single crystal of zeolite Na-Y (FAU, Si/Al = 1.69) was fully exchanged with Tl + , then exchanged with Ce 3+ , and dehydrated at 623 K and 2 × 10 -4 Pa to give |Ce 4 O 4 4+ 3.5 CeOH 2+ 4.6 Ce 3+ 2.1 H + 41.7 |[Si 121 Al 71 O 384 ]-FAU. Its structure was determined crystallographically (space group Fd 3 m, a = 24.909(1) Å) with synchrotron X-radiation and was refined using all 1236 unique data to R 1 = 0.067 (F o > 4σ(F o )) and R 2 = 0.247. The 20.5 Ce 3+ ions per unit cell occupy four crystallographically distinct cation sites: 0.5 are octahedral at site I, 1.6 are trigonal at site I', 13.8 are octahedral at a second site I', and 4.6 are tetrahedral at site II. The 13.8 Ce 3+ ions at the second site I' are members of Ce 4 O 4 4+ clusters, tetrahedrally distorted cubes occupying 43% of the sodalite cavities. Each of these Ce 3+ ions bonds octahedrally to three oxygen atoms of the zeolite framework (2.482(7) Å) and to three extraframework oxide ions (2.521(11) Å). Those at site II are 4-coordinate;each bonds to three oxide atoms of the zeolite framework (2.420(7) Å) and to one hydroxide ion (2.06(14) Å). The UV photoluminescence spectrum of this material has a broad emission band between 320 nm and 400 nm, peaking at 347 nm.

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Development of zeolite-derived novel aluminosilicate phosphors

Cited by 7 publications

References 16 publications

Relationship between Eu3+ substitution sites and photoluminescence properties of SrIn2O4:Eu3+ spinel phosphors

Relationship between Eu3+ substitution sites and photoluminescence properties of SrIn2O4:Eu3+ spinel phosphors

Effect of Synthesis Temperature on the Structure and Luminescence Properties of the NaAlSiO₄:Er³⁺ Phosphors

Encapsulating Photoluminescent Materials in Zeolites. II. Crystal Structure of Fully Dehydrated Ce₂₁H₄₆O₁₈–Y (Si/Al = 1.69) Containing Ce₄O₄⁴⁺, CeOH²⁺, Ce³⁺, and H⁺

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Development of zeolite-derived novel aluminosilicate phosphors

Cited by 7 publications

References 16 publications

Relationship between Eu3+ substitution sites and photoluminescence properties of SrIn2O4:Eu3+ spinel phosphors

Relationship between Eu3+ substitution sites and photoluminescence properties of SrIn2O4:Eu3+ spinel phosphors

Effect of Synthesis Temperature on the Structure and Luminescence Properties of the NaAlSiO4:Er3+ Phosphors

Encapsulating Photoluminescent Materials in Zeolites. II. Crystal Structure of Fully Dehydrated Ce21H46O18–Y (Si/Al = 1.69) Containing Ce4O44+, CeOH2+, Ce3+, and H+

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Effect of Synthesis Temperature on the Structure and Luminescence Properties of the NaAlSiO₄:Er³⁺ Phosphors

Encapsulating Photoluminescent Materials in Zeolites. II. Crystal Structure of Fully Dehydrated Ce₂₁H₄₆O₁₈–Y (Si/Al = 1.69) Containing Ce₄O₄⁴⁺, CeOH²⁺, Ce³⁺, and H⁺