Luminescence characteristics of Sr1−xBaxSi2O2N2:Eu2+ phosphors for white light emitting diodes

Anoop, Gopinathan; Cho, I. H.; Suh, Dong Wook; Yoo, Jae Soo

doi:10.1002/pssa.201228128

Cited by 14 publications

(14 citation statements)

References 25 publications

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“…The dashed line shows, based on points reported by different groups (Refs. 15,17,33,45,39, and this work), that the volume does not vary with Eu substitution. The scatter of the experimental points (especially that for Ce and Yb points added to the figure) can be attributed to differences in technology leading to compositional differences (such as a deviation in N/(N+O) ratio).…”

Section: A Phase Analysis and Rietveld Refinementsupporting

confidence: 63%

“…No systematic studies of α-SrSi 2 O 2 N 2 unit-cell size variation with doping could be found in literature, except that for Ba substitution at Sr sites (a monotonic increase is reported 45 ). Substituting a small amount of Eu 2+ ions at Sr sites is known to have no significant influence on the cell volume; 29 all six lattice parameters differ marginally between the side compounds, as Table II shows.…”

Section: A Phase Analysis and Rietveld Refinementmentioning

confidence: 99%

“…Reported structural data for α and β SrSi 2 O 2 N 2 phases 15,18,33,39,[43][44][45] are quoted in Table II. Equation of state describes fundamental physicochemical properties of a substance.…”

Section: Introductionmentioning

confidence: 99%

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Equation of state for Eu-doped SrSi2O2N2

Ermakova

Paszkowicz

Kamińska

et al. 2014

The Journal of Chemical Physics

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α-SrSi2O2N2 is one of the recently studied oxonitridosilicates applicable in optoelectronics, in particular in white LEDs. Its elastic properties remain unknown. A survey of literature shows that, up to now, nine oxonitridosilicate materials have been identified. For most of these compounds, doped with rare earths and manganese, a luminescence has been reported at a wavelength characteristic for the given material; all together cover a broad spectral range. The present study focuses on the elastic properties of one of these oxonitridosilicates, the Eu-doped triclinic α-SrSi2O2N2. High-pressure powder diffraction experiments are used in order to experimentally determine, for the first time, the equation of state of this compound. The in situ experiment was performed for pressures ranging up to 9.65 GPa, for Eu-doped α-SrSi2O2N2 sample mounted in a diamond anvil cell ascertaining the hydrostatic compression conditions. The obtained experimental variation of volume of the triclinic unit cell of α-SrSi2O2N2:Eu with rising pressure served for determination of the Birch-Murnaghan equation of state. The determined above quoted bulk modulus is 103(5) GPa, its first derivative is 4.5(1.1). The above quoted bulk modulus value is found to be comparable to that of earlier reported oxynitrides of different composition.

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Section: A Phase Analysis and Rietveld Refinementsupporting

confidence: 63%

Section: A Phase Analysis and Rietveld Refinementmentioning

confidence: 99%

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Equation of state for Eu-doped SrSi2O2N2

Ermakova

Paszkowicz

Kamińska

et al. 2014

The Journal of Chemical Physics

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“…In particular, 5d–4f transitions induce broad emission bands whose positions vary with the local environment of rare-earth ions in the host lattice. Thus, some Eu-doped oxynitrides have recently shown very attractive luminescence properties, such as AlN [25], α - and β -SiAlON [26–28], M 2 Si 5 N 8 and MSi 2 O 2 N 2 (with M being Ca, Sr or Ba) [29–35], or CaAlSiN 3 (abbreviated as CASN hereafter) [36–40]. …”

Section: Introductionmentioning

confidence: 99%

Local analysis of Eu²⁺emission in CaAlSiN₃

Dierre

Takeda

Sekiguchi

et al. 2013

Science and Technology of Advanced Materials

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We have investigated the local luminescence properties of Eu-doped CaAlSiN3 by using low-energy electron beam (e-beam) techniques. The particles yield broad emission centered at 655 nm with a shoulder at higher wavelength under light excitation, and a broad band around 643 nm with a tail at 540 nm under e-beam excitation. Using cathodoluminescence (CL) in a scanning electron microscope (SEM), we have observed small and large particles, which, although with different compositions, exhibit Eu2+-related emissions at 645 and 635 nm, respectively. Local CL measurements reveal that the Eu2+ emission may actually consist of several bands. In addition to the red broad band, regularly spaced sharp peaks have been occasionally observed. These luminescence variations may originate from a variation in the composition inside CaAlSiN3.

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“…The 537 nm peak in the GP70 and GP180 films is from the 4f 6 5d → 4f 7 transitions in Eu 2+ of the phosphor. 11,12 The GO−phosphor hybrid films show shoulder peaks at ∼500 nm (for GP70) and 510 nm (for GP180), which correspond to π−π* gap values of ∼2.56 and 2.43 eV, respectively. The origin of these emission peaks from the GO−phosphor hybrid films is discussed later.…”

Section: Resultsmentioning

confidence: 98%

Graphene Oxide–Phosphor Hybrid Nanoscrolls with High Luminescent Quantum Yield: Synthesis, Structural, and X-ray Absorption Studies

Rani¹,

Oh²,

Woo³

et al. 2015

ACS Appl. Mater. Interfaces

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Highly luminescent graphene oxide (GO)-phosphor hybrid thin films with a maximum quantum yield of 9.6% were synthesized via a simple chemical method. An intense luminescence emission peak at 537 nm and a broad emission peak at 400 nm were observed from the GO-phosphor hybrid films. The maximum quantum yield of the emissions from the hybrid films was found to be 9.6%, which is 48 times higher than that of pristine GO films. The GO-phosphor hybrids were prepared via spin-coating and subsequent postannealing of the films, resulting in scrolling of the GO sheets. The resulting GO nanoscrolls exhibited a length of ∼2 μm with nanoscale interior cavities. Transmission electron microscopy and selected-area electron diffraction analyses revealed that the lattice structure of the tubular scrolls is similar to that of carbon nanotubes. While pristine GO films are p-type, in the GO-phosphor hybrids, the Fermi level shifted upward and fell between the HOMO-LUMO gap due to phosphor attachment via C-N bonding. The highly luminescent GO-phosphor hybrids will find important applications in graphene-based optoelectronic devices.

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Luminescence characteristics of Sr_1−xBa_xSi₂O₂N₂:Eu²⁺ phosphors for white light emitting diodes

Cited by 14 publications

References 25 publications

Equation of state for Eu-doped SrSi2O2N2

Equation of state for Eu-doped SrSi2O2N2

Local analysis of Eu²⁺emission in CaAlSiN₃

Graphene Oxide–Phosphor Hybrid Nanoscrolls with High Luminescent Quantum Yield: Synthesis, Structural, and X-ray Absorption Studies

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Luminescence characteristics of Sr1−xBaxSi2O2N2:Eu2+ phosphors for white light emitting diodes

Cited by 14 publications

References 25 publications

Equation of state for Eu-doped SrSi2O2N2

Equation of state for Eu-doped SrSi2O2N2

Local analysis of Eu2+emission in CaAlSiN3

Graphene Oxide–Phosphor Hybrid Nanoscrolls with High Luminescent Quantum Yield: Synthesis, Structural, and X-ray Absorption Studies

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Luminescence characteristics of Sr_1−xBa_xSi₂O₂N₂:Eu²⁺ phosphors for white light emitting diodes

Local analysis of Eu²⁺emission in CaAlSiN₃