Effect of Annealing Time of YAG:Ce3+ Phosphor on White Light Chromaticity Values

Husnen R. Abd, Z. Hassan, Naser M. Ahmed, Munirah Abdullah Almessiere, A. F. Omar, Forat H. Alsultany, Fayroz A. Sabah, Ummu Shuhada Osman

Research output: Contribution to journalJournal articlepeer-review

19 Scopus citations

Abstract

Yttrium and aluminium nitrate phosphors doped with cerium nitrate and mixed with urea (fuel) are prepared by using microwave-induced combustion synthesis according to the formula Y(3–0.06)Al5O12:0.06Ce3+ (YAG:Ce3+) to produce white light emitting diodes by conversion from blue indium gallium nitride-light emitting diode chips. The sintering time with fixed temperature (1050°C) for phosphor powder was optimized and found to be 5 h. The crystallinity, structure, chemical composition, luminescent properties with varying currents densities and chromaticity were characterized by x-ray diffraction, field emission-scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, photoluminescence emission, electroluminescence and standard CIE 1931 chromaticity diagram, respectively. The energy levels of Ce3+ in YAG were discussed based on its absorption and excitation spectra. The results show that the obtained YAG:Ce3+ phosphor sintered for 5 h has good crystallinity with pure phase, low agglomerate with spherical shaped particles and strong yellow emission, offering cool-white LED with tuneable correlated color temperature and a good color rendering index compared to those prepared by sintering for 2 h and as-prepared phosphor powders.

Original languageEnglish
Pages (from-to)1638-1646
Number of pages9
JournalJournal of Electronic Materials
Volume47
Issue number2
DOIs
StatePublished - 1 Feb 2018

Keywords

  • chromaticity
  • microwave-oven method
  • White LED
  • YAG:Ce
  • yellow-green emission

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