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A novel Cs

Hong Ming1, Junfei Zhang, Lili Liu

  • 1School of Metallurgy and Chemistry Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, P. R. China. xinyye@yahoo.com.

Dalton Transactions (Cambridge, England : 2003)
|September 13, 2018
PubMed
Summary
This summary is machine-generated.

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A novel non-rare-earth Cs2NbOF5:Mn4+ red phosphor was synthesized at room temperature for high-quality lighting. This new material significantly enhances color rendering index and lowers correlated color temperature in white light-emitting diodes.

Area of Science:

  • Materials Science
  • Solid-State Lighting
  • Luminescent Materials

Background:

  • White light-emitting diodes (WLEDs) require red phosphors for high color rendering index (CRI) warm lighting.
  • Developing cost-effective red phosphors with desirable spectral properties is crucial for advanced WLED applications.

Purpose of the Study:

  • To synthesize and characterize a novel non-rare-earth red-emitting oxyfluoride phosphor, Cs2NbOF5:Mn4+.
  • To investigate its luminescent properties, including spectral features, quantum yield, and temperature stability.
  • To evaluate its performance in WLEDs for warm lighting applications.

Main Methods:

  • Facile room-temperature co-precipitation method for phosphor synthesis.
  • Morphological analysis (microscopy).

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  • Optical spectroscopy for absorption and emission characterization.
  • Evaluation of internal quantum yield (QY) and color properties.
  • Device fabrication combining InGaN LED chip with synthesized red and commercial yellow phosphors.

    • Main Results:

    • A novel Cs2NbOF5:Mn4+ red phosphor with micro-rod morphology was successfully synthesized.
    • The phosphor exhibits blue light absorption (~474 nm) and narrow red emission (~633 nm) with ~99% color purity.
    • Achieved an internal quantum yield (QY) of 63.4% and demonstrated good thermal stability (activation energy ~0.2610 eV).
    • WLEDs incorporating this phosphor showed a significant decrease in correlated color temperature (CCT) from 6255 to 3517 K and an increase in CRI from 72.5 to 87.5.

    Conclusions:

    • The Cs2NbOF5:Mn4+ phosphor is a promising non-rare-earth alternative for high-performance warm WLEDs.
    • The synthesis method is facile and cost-effective, suitable for industrial applications.
    • The developed niobium oxyfluoride matrix can be extended for designing new red phosphors.