[Synthesis of the red long afterglow phosphor Gd2O2S: Eu, Mg, Ti by microwave radiation method and its luminescent properties].

Guang pu xue yu guang pu fen xi = Guang pu · 2007 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 6455

Study snapshot

PublicationGuang pu xue yu guang pu fen xi = Guang pu · 2007

Study typeother

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Gd2O2S: Eu, Mg, Ti, a novel red long afterglow phosphor, was synthesized in microwave field. The synthesized phosphors were investigated respectively by XRD, SEM and fluorescence spectrophotometer. The results show that Gd2O2S: Eu, Mg, Ti phosphors possess hexagonal crystal structure, which is similar to that of Gd2O2S. The particles of Gd2O2S: Eu, Mg, Ti phosphors are basically spherical in shape, with good dispersing. The mean particle size is 1-2 microm. The excitation spectrum is a broad band and the main peak is at 360 nm. Moreover, excitation peaks at 400, 422 and 472 nm were found in the excitation spectrum. The emission spectrum shows that Gd2O2S: Eu, Mg, Ti has narrow emission peaks. The emission peaks are ascribed to Eu3+ ions transition from 5 D(J) (J = 0, 1, 2) to 7F(J) (J = 0, 1, 2, 3, 4). With the increase in Eu3+ molar ratio, the emission peaks at 586, 557, 541, 513, 498, 471 and 468 nm in the blue and green region weaken gradually relative to the main emission peak at 627 nm. Therefore the red emitting at 627 nm becomes strong gradually. When the molar ratio is 6%, the red emitting becomes the strongest. The Ti and Mg co-doping can obviously improve its long-afterglow property.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

A red long-afterglow phosphor (Gd2O2S: Eu, Mg, Ti) was synthesized using a microwave field and characterized by XRD, SEM, and fluorescence spectroscopy. The material showed a hexagonal crystal structure similar to Gd2O2S, roughly spherical particles (mean size 1–2 µm), excitation peaks including a main peak at 360 nm, and strongest red emission at 627 nm at 6% Eu3+ molar ratio; Ti and Mg co-doping improved long-afterglow properties.

Outcomes measured

phosphor crystal structure (XRD)
particle morphology/size (SEM)
excitation spectrum peaks
emission spectrum peaks
afterglow (long-afterglow) properties
effect of Eu3+ molar ratio on emission intensity
effect of Ti/Mg co-doping on afterglow

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "microwave radiation method (materials synthesis)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "phosphor crystal structure (XRD)",
    "particle morphology/size (SEM)",
    "excitation spectrum peaks",
    "emission spectrum peaks",
    "afterglow (long-afterglow) properties",
    "effect of Eu3+ molar ratio on emission intensity",
    "effect of Ti/Mg co-doping on afterglow"
  ],
  "main_findings": "A red long-afterglow phosphor (Gd2O2S: Eu, Mg, Ti) was synthesized using a microwave field and characterized by XRD, SEM, and fluorescence spectroscopy. The material showed a hexagonal crystal structure similar to Gd2O2S, roughly spherical particles (mean size 1–2 µm), excitation peaks including a main peak at 360 nm, and strongest red emission at 627 nm at 6% Eu3+ molar ratio; Ti and Mg co-doping improved long-afterglow properties.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave field",
    "microwave radiation method",
    "phosphor synthesis",
    "Gd2O2S",
    "Eu3+",
    "Mg co-doping",
    "Ti co-doping",
    "long afterglow",
    "luminescence",
    "XRD",
    "SEM",
    "excitation spectrum",
    "emission spectrum"
  ],
  "suggested_hubs": []
}

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Identifiers and source

DOI: Not supplied
PubMed: 17608162

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