Structure and photoluminescence properties of Ce{sup 3+}-doped novel silicon-oxynitride Ba{sub 4-z}M{sub z}Si{sub 8}O{sub 20-3x}N{sub 2x} (M=Mg, Ca, Sr)

Journal Article · Wed Jun 15 04:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.03.048· OSTI ID:21580091

Fang, Y ^[1]; Xie, R J; Hirosaki, N; Takade, T ^[2]; Li, X Y; Qiu, T ^[1]

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1. College of Materials Science and Engineering, Nanjing University of Technology, New Model Road 5, Nanjing, Jiangsu 210009 (China)
2. Nitride Particle Group, Nano Ceramics Center, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044 (Japan)

Structural and photoluminescence properties of undoped and Ce{sup 3+}-doped novel silicon-oxynitride phosphors of Ba{sub 4-z}M{sub z}Si{sub 8}O{sub 20-3x}N{sub 2x} (M=Mg, Sr, Ca) are reported. Single-phase solid solutions of Ba{sub 4-z}M{sub z}Si{sub 8}O{sub 20-3x}N{sub 2x} oxynitride were synthesized by partial substitutions of 3O{sup 2-}{yields}2N{sup 3-} and Ba{yields}M (M=Mg, Ca, Sr) in orthorhombic Ba{sub 2}Si{sub 4}O{sub 10}. The influences of the type of alkaline earth ions of M, the Ce{sup 3+} concentration on the photoluminescence properties and thermal quenching behaviors of Ba{sub 3}MSi{sub 8}O{sub 20-3x}N{sub 2x} (M=Mg, Ca, Sr, x=0.5) were investigated. Under excitation at about 330 nm, Ba{sub 3}MSi{sub 8}O{sub 20-3x}N{sub 2x}:Ce{sup 3+} (x=0.5) exhibits efficient blue emission centered at 400-450 nm in the range of 350-650 nm owing to the 5d{yields}4f transition of Ce{sup 3+}. The emission band of Ce{sup 3+} shifts to long wavelength by increasing the ionic size of M due to the modification of the crystal field, as well as the Ce{sup 3+} concentrations due to the Stokes shift and energy transfer or reabsorption of Ce{sup 3+} ions. Among the silicon-oxynitride phosphors of Ba{sub 3}MSi{sub 8}O{sub 18.5}N:Ce{sup 3+}, M=Sr{sub 0.6}Ca{sub 0.4} possesses the best thermal stability probably related to its high onset of the absorption edge of Ce{sup 3+}. - Graphical abstract: Excitation and emission spectra of Ba{sub 3}MSi{sub 8}O{sub 18.5}N:Ce{sup 3+} (M=Ca, Ce{sup 3+}=1 mol%) demonstrate that Ce{sup 3+}-doped novel silicon oxynitride emits blue light with a broad emission band in the range of 410-450 nm varying with the Ce{sup 3+} concentration under excitation at 330 nm. The luminescence properties are determined by the local crystal structure around Ba/Ca atom, where the activator ion of Ce{sup 3+} is occupied on the crystallographic site of Ba/Ca. Highlights: > Ce{sup 3+}-activated novel alkaline earth silicon-oxynitride phosphors were invented. > Crystal structure of the host was determined by the Rietveld method of powder XRD. > Incorporation of M (Mg, Ca, Sr) can largely increase the solid solubility of N. > Ba{sub 3}MSi{sub 8}O{sub 20-3x}N{sub 2x}:Ce{sup 3+} exhibits efficiently blue emission peaking at 400-450 nm. > Thermal quenching temperature of silicon-oxynitride phosphors is above 130 deg. C.

• OSTI ID: 21580091
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 6 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION
CERIUM
CERIUM IONS
CHARGED PARTICLES
COHERENT SCATTERING
CRYSTAL FIELD
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
DIFFRACTION
DISPERSIONS
DOPED MATERIALS
ELEMENTS
EMISSION
EMISSION SPECTRA
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITATION
HOMOGENEOUS MIXTURES
IONS
LUMINESCENCE
MATERIALS
METALS
MIXTURES
NITRIDES
NITROGEN COMPOUNDS
ORTHORHOMBIC LATTICES
OXYGEN COMPOUNDS
PHOSPHORS
PHOTOLUMINESCENCE
PHOTON EMISSION
PNICTIDES
RARE EARTHS
SCATTERING
SEMIMETALS
SILICON
SOLID SOLUTIONS
SOLIDS
SOLUBILITY
SOLUTIONS
SORPTION
SPECTRA
STABILITY
X-RAY DIFFRACTION