Multifunctional anti-stokes Y2O2S-based white phosphors

Manashirov, O. Ya.; Георгобиани, А. Н.; Gutan, V. B.; Zvereva, E. M.; Лобанов, А. Н.

doi:10.1134/s0020168512060118

Cited by 6 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…13 Manashirov et al developed and commercialized yttrium oxysulfide based blue, yellow and green phosphors and achieved white light from a triply doped complex oxysulfide system. 14 A white long-lasting phosphor based on Y 2 O 2 S:Tb 3+ , Sm 3+ is reported by Lin Lin et al 15 However, studies on the energy transfer (ET) process between the Eu 3+…”

Section: Introductionmentioning

confidence: 99%

The energy transfer phenomena and colour tunability in Y₂O₂S:Eu³⁺/Dy³⁺ micro-fibers for white emission in solid state lighting applications

et al. 2014

View full text Add to dashboard Cite

This paper reports on the structural, optical and photometric characterization of an Eu(3+)/Dy(3+) doped yttrium oxysulfide phosphor (Y2O2S:Eu(3+)/Dy(3+)) for near white emission in solid state lighting. A series of Y2O2S phosphors doped with Eu(3+)/Dy(3+) were prepared by the hydrothermal method. The microstructures of the as-synthesized phosphors were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD results reveal that the obtained powder phosphors have a single-phase hexagonal structure and also indicate that the incorporation of the dopants/co-dopants did not affect the crystal structure. The SEM images reveal the morphology of the prepared phosphors as an intense interpenetrating network of interconnected micro-fibers with a diameter of about 0.15 μm. The band gap of the phosphors was calculated from diffuse reflectance spectra using the Kubelka-Munk function. The Eu(3+), Dy(3+) doped and Eu(3+)/Dy(3+) co-doped phosphors illuminated with ultraviolet light showed characteristic red luminescence corresponding to the (5)D0→(7)FJ transitions of Eu(3+) and characteristic blue and yellow luminescence corresponding to the (4)F9/2→(6)H15/2 or (4)F9/2→(6)H13/2 transitions of Dy(3+). The luminescence spectra, the energy transfer efficiency and the decay curves of the phosphors indicated that there exists a strong energy transfer from Dy(3+) to Eu(3+) and this was demonstrated to be a resonant type via a dipole-quadrupole reaction. Furthermore, the critical distance of the Eu(3+) and Dy(3+) ions have also been calculated. By utilizing the principle of energy transfer it was also demonstrated that with an appropriate tuning of the activator content the Y2O2S:Eu(3+)/Dy(3+) phosphors can exhibit a great potential to act as single-emitting component phosphors for white light emission in solid state lighting technology.

show abstract

Section: Introductionmentioning

confidence: 99%

The energy transfer phenomena and colour tunability in Y₂O₂S:Eu³⁺/Dy³⁺ micro-fibers for white emission in solid state lighting applications

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Among these materials, Y 2 O 2 S is one of the most important hosts for lanthanide(Ln 3? )-doped phosphors [7][8][9], providing a wide band gap (4.6-4.8 eV) and suitable Y 3? ions sites where Y 3? can be easily substituted by other trivalent rare earth ions without additional charge compensation. Y 2 O 2 S:Ln 3? have become a very important family of inorganic phosphor materials that have wide applications in the fields of diodes [10], field emission display [11], and biological detection systems.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Y2O2S:Eu3+ hollow nanofibers by sulfurization of Y2O3:Eu3+ hollow nanofibers

Han

Pan

et al. 2014

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Y 2 O 3 :Eu 3? hollow nanofibers were prepared by calcination of the electrospun PVP/[Y(NO 3 ) 3 ? Eu(NO 3 ) 3 ] composite nanofibers, and then Y 2 O 2 S:Eu 3? hollow nanofibers were successfully synthesized by sulfurization of the as-obtained Y 2 O 3 :Eu 3? hollow nanofibers via a double-crucible method using sulfur powders as sulfur source. The samples were investigated in detail by X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, and fluorescence spectroscopy. XRD analysis shows that the Y 2 O 2 S:Eu 3? hollow nanofibers are pure hexagonal phase with the space group of P " 3m1. SEM observation indicates that as-prepared Y 2 O 2 S:Eu 3? nanofibers are obvious hollowcentered structure with the mean outer diameter of 184 ± 26 nm. Under the excitation of 260-nm ultraviolet light, the Y 2 O 2 S:Eu 3? hollow nanofibers exhibit red emissions of predominant emission peaks at 628 and 618 nm originated from 5 D 0 ? 7 F 2 energy levels transitions of Eu 3? ions. The luminescent intensity of Y 2 O 2 S:Eu 3? hollow nanofibers is remarkably increased with the increase of doping concentration of Eu 3? ions and reaches a maximum at 3 mol % of Eu 3? ions. The emitting colors of the samples are located in the red region in CIE chromaticity coordinates diagram. The possible formation mechanism of Y 2 O 2 S:Eu 3? hollow nanofibers is also proposed. This preparation technique could be applied to prepare other rare earth oxysulfide hollow nanofibers.

show abstract

“…Up-conversion materials have recently attracted the interest of scientists from various countries due to their special luminescence properties. [1][2][3] In the past few years, as an important matrix of luminescent materials, Y 2 O 2 S with high chemical and thermal stability is one of the most important host crystals of lanthanide-doped phosphors, 4,5 exhibiting a wide band gap (4.6-4.8 eV) 6 and providing suitable Y 3+ sites where Y 3+ can be easily substituted by other trivalent rare earth ions without additional charge compensation. Especially, lanthanide ion activated Y 2 O 2 S compounds have become a very important family of up-conversion materials and have been widely applied in the fields of infrared detection, 7 labeling, 8,9 and bioimaging.…”

Section: Introductionmentioning

confidence: 99%

A new tactic to achieve Y₂O₂S:Yb³⁺/Er³⁺ up-conversion luminescent hollow nanofibers

Han

Pan

et al. 2015

CrystEngComm

View full text Add to dashboard Cite

Yb 3+ /Er 3+ hollow nanofibers were prepared by calcination of monoaxial electrospinning-made PVP/ĳYĲNO 3 ) 3 + YbĲNO 3 ) 3 + ErĲNO 3 ) 3 ] composite nanofibers, and then Y 2 O 2 S:Yb 3+ /Er 3+ hollow nanofibers were synthesized by sulfurization of the as-obtained Y 2 O 3 :Yb 3+ /Er 3+ hollow nanofibers via a double crucible method using sulfur powder as the sulfur source. X-ray diffraction (XRD) analysis shows that Y 2 O 2 S:Yb 3+ /Er 3+ hollow nanofibers are pure hexagonal phase with the space group P3m1. Scanning electron microscope (SEM) observation indicates that Y 2 O 2 S:Yb 3+ /Er 3+ hollow nanofibers are obviously hollow-centered with a mean outer diameter of 226 ± 21 nm. Up-conversion emission spectrum analysis manifests that Y 2 O 2 S:Yb 3+ /Er 3+ hollow nanofibers emit strong green and weak red up-conversion emission bands centered at 526, 546 and 667 nm. The green emission and the red emission bands respectively originated from 2 H 11/2 / 4 S 3/2 → 4 I 15/2 and 4 F 9/2 → 4 I l5/2 energy level transitions of Er 3+ ions. The optimum molar ratio of Yb 3+ to Er 3+ in Y 2 O 2 S:Yb 3+ /Er 3+ hollow nanofibers is 5 : 1. The emitting colors of Y 2 O 2 S:Yb 3+ /Er 3+ hollow nanofibers are located in the green region of the CIE chromaticity coordinate diagram. The formation mechanism of Y 2 O 2 S:Yb 3+ /Er 3+ hollow nanofibers is also studied. This preparation technique can be applied to prepare other rare earth oxysulfide hollow nanofibers.

show abstract

Multifunctional anti-stokes Y2O2S-based white phosphors

Cited by 6 publications

References 0 publications

The energy transfer phenomena and colour tunability in Y₂O₂S:Eu³⁺/Dy³⁺ micro-fibers for white emission in solid state lighting applications

The energy transfer phenomena and colour tunability in Y₂O₂S:Eu³⁺/Dy³⁺ micro-fibers for white emission in solid state lighting applications

Fabrication of Y2O2S:Eu3+ hollow nanofibers by sulfurization of Y2O3:Eu3+ hollow nanofibers

A new tactic to achieve Y₂O₂S:Yb³⁺/Er³⁺ up-conversion luminescent hollow nanofibers

Contact Info

Product

Resources

About

Multifunctional anti-stokes Y2O2S-based white phosphors

Cited by 6 publications

References 0 publications

The energy transfer phenomena and colour tunability in Y2O2S:Eu3+/Dy3+ micro-fibers for white emission in solid state lighting applications

The energy transfer phenomena and colour tunability in Y2O2S:Eu3+/Dy3+ micro-fibers for white emission in solid state lighting applications

Fabrication of Y2O2S:Eu3+ hollow nanofibers by sulfurization of Y2O3:Eu3+ hollow nanofibers

A new tactic to achieve Y2O2S:Yb3+/Er3+ up-conversion luminescent hollow nanofibers

Contact Info

Product

Resources

About

The energy transfer phenomena and colour tunability in Y₂O₂S:Eu³⁺/Dy³⁺ micro-fibers for white emission in solid state lighting applications

The energy transfer phenomena and colour tunability in Y₂O₂S:Eu³⁺/Dy³⁺ micro-fibers for white emission in solid state lighting applications

A new tactic to achieve Y₂O₂S:Yb³⁺/Er³⁺ up-conversion luminescent hollow nanofibers