Gel Nitridation Preparation and Luminescence Property of Eu-doped <i>RE</i>2O2CN2 (<i>RE</i> = La and Gd) Phosphors

Takeda, Takashi; Hatta, Naoya; Kikkawa, Shinichi

doi:10.1246/cl.2006.988

Cited by 17 publications

(15 citation statements)

References 11 publications

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“…% compared to 4 at. % previously reported in sol-gel synthesis [15] . Figure 2 shows the IR spectra of Gd 2 O 2 CN 2 :Eu 3+ samples with different concentration of Eu 3+ .…”

Section: Resultsmentioning

confidence: 97%

“…The luminescent properties of RE 2 O 2 CN 2 :M 3+ (Ln = Y, Gd and La, M 3+ = Tb 3+ , Eu 3+ , Pr 3+ , Er 3+ and Er 3+ /Tb 3+ ) have been previously studied [11][12][13][14] . Eu 3+ doped Gd 2 O 2 CN 2 was firstly prepared by sol-gel method by Takeda et al, but the luminescence intensity was weak because of its low crystallinity and the suppression of concentration quenching was not recognized because of the presence of impurities for high Eu-doping concentration [15] . Thus, we propose here to further investigate the preparation and photoluminescence properties of pure micrometric Gd 2 O 2 CN 2 :Eu 3+ phosphors.…”

Section: Introductionmentioning

confidence: 99%

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Luminescent properties of novel red-emitting phosphor: Gd_2O_2CN_2:Eu^3+

Wang¹,

Yuan²,

Yang³

et al. 2015

Opt. Mater. Express

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Eu 3+ -doped Gd 2 O 2 CN 2 was firstly synthesized by a classical solid-state reaction of Li 2 CO 3 , Eu 2 O 3 and GdF 3 under NH 3 gas flow in the presence of graphite at low firing temperature. Powder X-ray diffraction (XRD) analysis indicated that Gd 2 O 2 CN 2 : Eu 3+ crystallizes in a trigonal-type structure with space group P-3m1.Gd 2 O 2 CN 2 : Eu 3+ shows a sharp red emission band peaking at 626 nm under excitation at 300 nm at room temperature. PL spectra indicates that Eu 3+ doped Gd 2 O 2 CN 2 samples emit the typical emission peaks at 614 nm and 626 nm originated from the hypersensitive electric dipole transition ( 5 D 0 → 7 F 2 ) of Eu 3+ ions. The optimized doping concentration of Eu 3+ ions was found to be 7.5 at.%, and the critical transfer distance was calculated to be 10.907 Å.

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“…% compared to 4 at. % previously reported in sol-gel synthesis [15] . Figure 2 shows the IR spectra of Gd 2 O 2 CN 2 :Eu 3+ samples with different concentration of Eu 3+ .…”

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Luminescent properties of novel red-emitting phosphor: Gd_2O_2CN_2:Eu^3+

Wang¹,

Yuan²,

Yang³

et al. 2015

Opt. Mater. Express

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“…[24] To increase the doping range new synthetic pathways involving a sol-gel method were studied. [25] However, attempts to synthesize lanthanide dioxo monocarbodiimides of the heavy rare earth elements have yet not been successful. By studying metathesis reactions between lanthanide chlorides and lithium cyanamide Meyer et al were recently able to obtain Y 2 O 2 CN 2 [26] as well as the second formula type in the system Ln/O/C/N with composition La 2 OA C H T U N G T R E N N U N G (CN 2 ) 2 .…”

Section: Introductionmentioning

confidence: 99%

Precursor Approach to Lanthanide Dioxo Monocarbodiimides Ln₂O₂CN₂ (Ln=Y, Ho, Er, Yb) by Insertion of CO₂ into Organometallic Ln–N Compounds

Zeuner

Pagano

Schnick

2008

Chemistry A European J

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We present two organometallic precursor approaches leading to the hitherto-unknown dioxo monocarbodiimides (Ln(2)O(2)CN(2)) of the late lanthanides Ho, Er, and Yb as well as yttrium. One involves insertion of CO(2), and the other one is a straightforward route using a molecular single-source precursor. To this end the reactivity of the activated amido lanthanide compound [(Cp(2)ErNH(2))(2)] towards carbon dioxide absorption under supercritical conditions was studied. Selective insertion of CO(2) into the amido complex yielded the single-source precursor [Er(2)(O(2)CN(2)H(4))Cp(4)], which was characterized by vibrational spectroscopy and thermal and elemental analyses. Ammonolysis of this amorphous compound at 700 degrees C affords Er(2)O(2)CN(2). To gain deeper insight into the structural characteristics of the amorphous precursor, a similar molecular carbamato complex was synthesized and fully characterized. X-ray structure analysis of the dimeric complex [Cp(4)Ho(2){mu-eta(1):eta(2)-OC(OtBu)NH}] shows an unusual bonding mode of the tert-butylcarbamate ligand, which acts as both a bridging and side-on chelating group. Ammonolysis of this compound also yielded dioxo monocarbodiimides, and therefore the crystalline carbamato complex turned out to be an alternative precursor for the straightforward synthesis of Ln(2)O(2)CN(2). Analogously, the dioxo monocarbodiimides of Y, Ho, Er, and Yb were synthesized by this route. The crystal structures were determined from X-ray powder diffraction data and refined by the Rietveld method (Ln=Ho, Er). Further spectroscopic characterization and elemental analysis evidenced the existence of phase-pure products. The dioxo monocarbodiimides of holmium and erbium crystallize in the trigonal space group P[over]3m1. According to X-ray powder diffraction, they adopt the Ln(2)O(2)CN(2) (Ln=Ce-Gd) structure type.

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“…[13][14][15][16][17] All of the homologous Ln 2 O 2 CN 2 :RE 3+ compounds were synthesized by following a solid-state metathesis (SSM) method. The luminescence properties of Ln 2 O 2 CN 2 :RE 3+ (Ln = La, Y, and Gd; RE = Pr and Eu) have been previously reported.…”

Section: Introductionmentioning

confidence: 99%

A Technique to Fabricate La₂O₂CN₂:Tb³⁺ Nanofibers and Nanoribbons with the Same Morphologies as the Precursors

Guo

Dong

et al. 2014

Eur J Inorg Chem

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Terbium(III)-doped lanthanum dioxymonocyanamide (La 2 O 2 CN 2 :Tb 3+ ) nanofibers and nanoribbons were fabricated, by the cyanamidation technique, from precursor La 2 O 3 :Tb 3+ nanofibers and nanoribbons prepared by electrospinning. The morphology of the final products were the same as those of the precursors. X-ray powder diffraction analysis indicated that the crystal phase of La 2 O 2 CN 2 :Tb 3+ is tetragonal in space group I4/mmm. SEM analysis revealed that the thickness and width of the La 2 O 2 CN 2 :Tb 3+ nanoribbons is about 184 nm and 3.53 Ϯ 0.37 μm, respectively, and the diameter of the La 2 O 2 CN 2 :Tb 3+ nanofibers is 175.87 Ϯ 16.23 nm at a 95 % confidence level. When excited with a 274 nm ultraviolet light source, the La 2 O 2 CN 2 :Tb 3+ nanostructures emit predominantly at 543 nm; this emission originates from the 5 D 4 Ǟ 7 F 5 energy level transition of the [a]

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Gel Nitridation Preparation and Luminescence Property of Eu-doped RE2O2CN2 (RE = La and Gd) Phosphors

Cited by 17 publications

References 11 publications

Luminescent properties of novel red-emitting phosphor: Gd_2O_2CN_2:Eu^3+

Luminescent properties of novel red-emitting phosphor: Gd_2O_2CN_2:Eu^3+

Precursor Approach to Lanthanide Dioxo Monocarbodiimides Ln₂O₂CN₂ (Ln=Y, Ho, Er, Yb) by Insertion of CO₂ into Organometallic Ln–N Compounds

A Technique to Fabricate La₂O₂CN₂:Tb³⁺ Nanofibers and Nanoribbons with the Same Morphologies as the Precursors

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Gel Nitridation Preparation and Luminescence Property of Eu-doped RE2O2CN2 (RE = La and Gd) Phosphors

Cited by 17 publications

References 11 publications

Luminescent properties of novel red-emitting phosphor: Gd_2O_2CN_2:Eu^3+

Luminescent properties of novel red-emitting phosphor: Gd_2O_2CN_2:Eu^3+

Precursor Approach to Lanthanide Dioxo Monocarbodiimides Ln2O2CN2 (Ln=Y, Ho, Er, Yb) by Insertion of CO2 into Organometallic Ln–N Compounds

A Technique to Fabricate La2O2CN2:Tb3+ Nanofibers and Nanoribbons with the Same Morphologies as the Precursors

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Precursor Approach to Lanthanide Dioxo Monocarbodiimides Ln₂O₂CN₂ (Ln=Y, Ho, Er, Yb) by Insertion of CO₂ into Organometallic Ln–N Compounds

A Technique to Fabricate La₂O₂CN₂:Tb³⁺ Nanofibers and Nanoribbons with the Same Morphologies as the Precursors