Spectral and surface investigations on Eu3+ doped K 3Y(PO4)2 nanophosphor: A promising orange-red phosphor for white light-emitting diodes

Palvi Gupta, A. K. Bedyal, Vinay Kumar, Y. Khajuria, Vinod Kumar, E. Coetsee-Hugo, O. M. Ntwaeaborwa, H. C. Swart

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Eu3+ doped K3Y(PO4)2 nanophosphors have been synthesized by the combustion method and their spectral and surface properties were examined. The phosphors have been well characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy and optical spectroscopy. For surface investigation X-ray photo electron spectroscopy has been used. Under various UV excitation (257, 320, 362, 382, 395 nm) the Eu3+ doped K3Y(PO 4)2 phosphor emits characteristic (4f-4f) orange-red emission of the Eu3+ (5D07Fj, j = 1, 2, 3, 4). The absorption spectra of the phosphor were found to be consistent with the excitation spectra. Diffuse reflectance spectra were used to calculate the band gap of 4.67 eV. The calculated International Commission on Illumination coordinates (0.628, 0.370) of the phosphor under an excitation wavelength of 395 nm was found to be similar to the commercially available Y2O2S:Eu3+ (0.622, 0.351). Therefore, the material may be a good candidate for the production of the red component in the UV chip based WLEDs.

Original languageEnglish
Pages (from-to)996-1001
Number of pages6
JournalOptical Materials
Volume36
Issue number5
DOIs
Publication statusPublished - Mar 2014
Externally publishedYes

Keywords

  • Phosphate nanophosphor
  • Photoluminescence
  • WLED
  • XPS

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Computer Science
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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